U.S. DEPARTMENT OF THE INTERIOR 

U.S. GEOLOGICAL SURVEY

Sediment Magnetic Data and Thermomagnetic Determinations of

Modern and Ancient Soils and Parent Materials near McCook, Red

Willow County, Nebraska: Contributions to Quaternary Paleoclimatic

Studies of Midcontinent Loess Deposits

by 

Stephen S. Harlan1 , Joesph G. Rosenbaum1 , Dan Muhs1 , and E.A.Bettis,

Open-file Report 98-46

This report has not been reviewed for conformity with U.S. Geological Survey 

editorial standards or with the North America Stratigraphic Code. Any use of 

trade, product, or firm names in this report is for descriptive purposes only and 

does not imply endorsement by the U.S. Government.

1 U.S. Geological Survey, Denver, Colorado, 80225 

2 lowa Department 

Iowa, 52242-1319

of Natural Resources, Geological Survey Bureau, Iowa City,

1998
INTRODUCTION

This paper presents sediment magnetic data from Quaternary soil and 

parent loess material from near McCook in western Nebaraska. These data were 

collected as part of a broader study of the magnetic properties of Midcontinent 

soils and loess. The ultimate objective is to better understand the types, 

properties, and origin of magnetic minerals in midcontinent soils and loess and 

their relations to past amounts of precipitation. The magnetic data presented 

here are part of a larger study by the U.S. Geological Survey of North American 

paleoclimates during the last interglacial period.

The exposure is a borrow pit south of McCook, Nebraska on the north 

side of U.S. Highway 34. The geology of this exposure locality has not been 

previously described. The modern soil at this locality is eroded, so an intact 

modern soil was collected on a flat, stable upland approximately 2 km northwest 

of McCook. At the borrow pit, approximately 5 m of Peoria loess are exposed, 

underlain by the Oilman Canyon Formation (0.55 m thick), a Sangamon soil (1.3 

m thick), and by Loveland loess (0.35 m).

METHODS 

Sampling

Samples were collected in two traverses that consisted of a modern soil 

profile developed on the Peoria Loess and two paleosols and loesses exposed in 

a nearby borrow pit. Samples were collected as representative "channel" 

samples from each of the major soil units (e.g., the A1 horizon, the BK2 horizon, 

etc.). Each sample was collected from material over the exposed depth range of 

the horizon.

For the analysis of magnetic properties such as magnetic susceptibility 

and laboratory induced magnetizations, splits of the soil and loess samples were 

packed into plastic cubes that are capable of holding approximately 3.2 cm3 of 

material. Each sample and cube were weighed, and the average weight of an 

empty sample holder was subtracted from the gross weight in order to get the 

true weight of the sample.

Magnetic Susceptibility

A susceptibility meter, operating at a sensitivity better than 10~5 volume SI 

at about 600 Hz or 6000 Hz, was used to measure low-frequency (LFMS) and 

high-frequency (HFMS) magnetic susceptibility of soil and loess samples. In 

addition, useful magnetic parameters, the frequency dependence of magnetic 

susceptibility (FDMS) and the percentage of FDMS (%FDMS), were calculated 

using the following formulas:
FDMS = LFMS-HFMS,

and

%FDMS = [(LFMS-HFMS)/LFMS] * 100. 

Magnetic susceptibility data are listed in Table 1. 

Laboratory Induced Magnetizations

An anhysteretic remanent magnetization was imparted to each sample by 

placing it in a slowly decaying alternating field with a peak field of 100 ml while 

it was subjected to a DC bias of 0.1 ml. The ARM was then measured using a 

high-speed spinner magnetometer operating at 90 Hz. Following the ARM 

acquisition experiments, an impulse magnetizer was used to impart isothermal 

remanent magnetizations (IRMs) to each specimen. Each specimen was given 

an initial IRM in an induction of 1.2 T (i.e., IRM1.2T), and the resultant 

magnetization was measured using the spinner magnetometer. Each sample 

was then given an oppositely directed IRM in an induction of 0.3 T (IRM.0.3i) and 

the remanence was again measured with the magnetometer. The "hard" 

isothermal remanent magnetization (HIRM) and the S parameter were then 

calculated as:

HIRM = (IRMi.2 + IRM_0. 3)/2,

and S = -IRM.Q.3/IRML2, 

as suggested by King and Channel (1991).

Induced magnetization data and the HIRM and S parameters are listed in 

Table 1.

Thermomagnetic Determinations

Curie temperatures were determined for magnetic minerals separated 

from several bulk sediment/soil samples. Separation of the magnetic phases was 

made by dispersing the soil or loess sample in distilled water, along with a small 

amount of a surfactant, in an ultrasonic cleaner. The resultant slurry was then 

pumped past a permanent magnet using a technique similar to that described by 

Petersen and others (1986). The resultant magnetic separates were rinsed with 

acetone to remove water and then allowed to dry in air.

Curie temperatures of the soil and loess samples were investigated using 

two different types of thermomagnetic devices. The first consisted of sensitive 

electrobalance similar to that described by Larson and others (1975). In this
device, saturation magnetization in an applied field of 0.2 to 0.45 T was 

measured as a function of temperature. The samples were heated in air up to a 

maximum temperature of about 660°C (approximately 15°C/min) and then 

allowed to cool to near room temperature. Each sample consisted of about 0.15 

to 0.40 mg of magnetic material separated from the magnetic separate using a 

hand magnet. Thermomagnetic curves obtained using the Curie balance are 

given in Figure 1.

The second device used in the thermomagnetic experiments measured 

magnetic susceptibility as a function of temperature. In this device, the magnetic 

separate was placed in dry AI203 powder and placed in a quartz tube. A platinum 

temperature sensor was then inserted into the tube such that the end of the 

sensor was nearly in contact with the magnetic separate. The sample was then 

heated in a series of steps to a peak temperature of 630 to 660°C and then 

cooled. Magnetic susceptibility was measured approximately every 3°C by 

inserting the furnace assembly into a coil and switching off the furnace current. 

Thermomagnetrc experiments were performed both in an atmospheric 

environment and by allowing a low flow (approximately 0.05 liters/min) of argon 

to pass over the sample. The magnetic susceptibility of all samples were 

corrected for the diamagnetic susceptibility of the quartz tube and AI2 03 powder 

by subtracting the average susceptibility of a "blank" sample consisting of a 

quartz tube containing an approximately equivalent amount of AI2 03 to that used 

in each experiment.

Experiments at the U.S. Geological Survey sediment magnetism 

laboratory (Denver) have shown that the Curie temperature of individual samples 

determined using this device, held in a constant position from experiment to 

experiment, are reproducible to about 1 to 2°C (assuming no significant phase 

changes during the experiments). The presence of temperature gradients in the 

furnace system and inherent uncertainties in the position of samples in individual 

heating experiments, however, indicates that the uncertainty in the determination 

of Curie temperatures for individual samples is probably on the order of 4 to 5°C 

(one standard deviation). Thermomagnetic curves of magnetic susceptibility vs. 

temperature are shown in Figure 2; analytical data obtained during these 

experiments are listed in Table 2.

ACKNOWLEDGMENTS

We thank Richard L. Reynolds for a careful review of the manuscript. 

Willie Rivers assisted in sample preparation and analyses.
REFERENCES

King, J.W., and Channel, J.E.T., 1991, Sedimentary magnetism, environmental 

magnetism, and magnetostratigraphy: Reviews of Geophysics, 

Supplement, p. 358-370.

Larson, E.E., Hoblitt, R.P., and Watson, D.E., 1975, Gas-mixing techniques in 

thermomagnetic analysis: Geophysical Journal of the Royal Astronomical 

Society, v. 43, p. 607-620.

Petersen, N., Von Dobonek, T., and Vali, H., 1986, Fossil bacterial magnetite in 

deep-sea sediments from the South Atlantic Ocean: Nature, v. 320, p. 611- 

615.
Figure 1. Thermomagnetic curves of saturation magnetization vs. temperature 

for magnetic separates of soil and loess samples from the McCook localities. For 

each sample the sample depth given is the true depth of the sample midpoint. All 

thermomagnetic determinations were made in air.
Saturation Magnetization

o 

o

H o 

o> o

3 

 a 

a> ^ w

18

O O 

O

O1 

O 

O

O) 

O

o

O I 

O 0

 & 5' 5'

CQ (Q

CD 0

j^- 

IE > C/) 

0 "U Q> 

5i H 3 "

(Q Q_ fl)" 

O en g

|- 0

=3 CO

Q)
Saturation Magnetization

o o

H o -\

(D O

3

TD 

(D

OO 0)

« H C

(D

^ x. o o

o -

Ol

o o

o> 

o o

O

O (D

O fl)

 i t

13' D 

CQ CQ

O O 

C c

(D (D

I > (S) 

CD "O fl) 

i ^3 

i 

CQ (D O

Q)
Saturation Magnetization

<D

o o

, H 

o

CD o

3

T3 

CD 

^ CA>

f 8

CDO o o

en 

o o

O)

o o

O I

O (D 

O 0)

^7- r^-

=J 13' 

CQ (Q

O O

C d

CD (D

31 > V) 

(D "D 0) 

^" ^^^ 

Q) "D_ q 

^"^* «»« » 

13 

CQ

CD

0.

O o

I- (D 

D !£_ 

Q)
Saturation Magnetization

o 

o

 ^^

H O 

CD O

3

T3 

CD

 i CO

18

O O 

O

Ol

o 

o

O)

o 

o

O I

O CD

O 0)

^- r*

3 Z*'

CQ (Q

8 8

CD CD

IE > V) 

(D T3 CD 

CD T3 13 T

CQ

CD 31 

Q. (D

Q*3 

i.S1 '0

_j (/) CD"
Saturation Magnetization

O

o

hO

H o

CD O

3

T3 

CD

|l

CD

o O 

O

en 

o 

o

o 

o

O I

O 0

O Q)

 «-*» 3' ZJ*

CQ (Q

o o

c c

CD 0

n: >

Q)

CQ

(7) 

Q) 

T3 q T

f^-

^^ 

K)

3

CQ

Q)
Figure 2. Thermomagnetic curves of magnetic susceptibility vs. temperature for 

magnetic separates of soil and loess samples from the McCook localities. 

Thermomagnetic experiments were either conducted in air or in a flowing argon 

environment as specified on each plot. Depth measurements as in Fig. 1.

12
900 -i 

800 

700 

600 H 

500

rg 400 H "a. 

d)

13 

to

300 -

200 -

100 -

0 -

0

Ne530

Unit: 

Depth

Blank 

Heating Curve 

Cooling Curve

100 200 300 400

Temperature (°C)

50
250 -

200 -

CO

150 -

X">^^

>>

Q.

0

O

100 -

50

0 -

0

Ne530-2 

Unit: Oil

Depth: 

Blank C

Heating Curve 

Cooling Curve

100 200 300 400

Temperature (°C)

500 
350 -i

300 -

^ 250 

CO

CD

O

x 200

:9 150 -

-* »

Q_

CD

O

=3 100

50 -

0 -

Ne530-3 

Unit: Oilm

Depth: 5

Blank Co

\

\

Heating Curve 

Cooling Curve

0 100 200 300 400

Temperature (°C)

500 
350 -i

300 -

^ 250 -

CO

o

x 200

:g 150 ^ "o.

o

= 100 H 

CO

50 -

0

0

Ne530-7 

Unit: Sa

Depth: 5

Blank Co

Heating Curve 

Cooling Curve

100 200 300 400

Temperature (°C)

500 
Table 1. Sediment Magnetic Data from McCook Localities, Red Willow

County, Nebraska.

Sample No: A unique number assigned to loess and/or sediment samples that 

are placed in approximately 3.2 cm plastic boxes.

Unit: The lithologic unit from which the sample was derived.

Depth (m): The original depth in the section from which the sample was 

obtained. In general, this number represents the midpoint of the interval over 

which the sample was collected.

Com. Depth (m): The depth obtained after combining the Elba Modern soil with 

the other two sampling profiles. Because there is a break in section, the 

composite depth for the loess sections was calculated by arbitrarily adding 1.8 m 

to the true sampling depth for both the detailed section and the "bulk" section.

:

Mass (g): Sample mass after correction for weight of the empty sample box.

LFMS (m3/kg): the low frequency magnetic susceptibility obtained by multiplying 

the LFMS (emu/g) by 4n/1000 to obtain units of m3/kg.

HFMS (m3/kg): the high frequency magnetic susceptibility (in m 3/kg) obtained by 

multiplying the HFMS (emu/g) by 4n/1000 to obtain units of m3/kg.

FDMS (m3/kg): Frequency dependent magnetic susceptibility = LFMS-HFMS in 

units of m3/kg.

%FDMS: The percent frequency dependent magnetic susceptibility = [(LFMSHFMS)/LFMS]x 100.

ARM (Am2/kg): the raw moment of the anhysteretic remanent magnetization 

divided by the sample mass to obtain units of Am2/kg.

IRM 1.2T (Am2/kg): the raw moment of the isothermal remanent magnetization 

acquired in an induction of 1.2 T, divided by the sample mass to obtain units of 

Am2/kg.

IRM-0.3T (Am2/kg): the raw moment of the isothermal remanent magnetization 

acquired after first exposing the sample to an induction of 1.2 T, followed by the 

application of an oppositely directed induction of 0.3T. The moment of the IRM 

has been divided by the sample mass to obtain units of Am2/kg.

HIRM: the "hard" isothermal remanent magnetization obtained by the formula: 

(IRMi.2T+IRM.0.3T)/2, in units of Am2/kg.

17
S: the S parameter defined as: -IRM.0.3T/IRMi.2T (dimensionless).

ARM/MS: The ratio of the anhysteretic remanent magnetization divided by the 

low frequency magnetic susceptibility, in A/m

SIRM/MS: the ratio of the isothermal remanent magnetization at 1.2T divided by 

the low frequency magnetic susceptibility, in A/m.

MS/SIRM: the inverse of the SIRM/MS, in m/A.

18
Table 1. Sediment Magnetic Data from the McCook Localities, Red Willow County, Nebraska

Sample No.

Modem Soil 

Locality, About 2 

kmNWof 

McCook, NE 

NE53018 

NE53019 

NE 530 20 

NE 530 21 

NE 530 22 

NE 530 23 

NE 530 24 

NE 530 25 

NE 530 26 

NE 530 27 

NE 530 28 

NE 530 29 

Borrow Pit 

Locality, about 

1.5kmSWof 

McCook, NE 

NE53017 

NE53016 

NE53015 

NE 53014 

NE53013 

NE 530 1 

NE 530 2 

NE 530 3 

NE 530 4 

NE 530 5 

NE 530 6 

NE 530 7 

NE 530 8 

NE 530 9 

NE 53010 

NE53011 

NE53012

Soil Unit

Modern soil Ap

Modern soil A

Modern soil Bw1

Modern soil Bw1

Modern soil Bw2

Modern soil Bw2

Modern soil BC

Modern soil BC?

Peoria Loess

Peoria Loess

Peoria Loess

Peoria Loess

Peoria Loess

Peoria Loess

Peoria Loess

Peoria Loess

Peoria Loess

Oilman Canyon A

Oilman Canyon A

Oilman Canyon A

Sangamon Bt1k

Sangamon Bt1k

Sangamon Bt2k

Sangamon Bt2k

Sangamon Bk1

Sangamon Bk2

Sangamon Bk3

Loveland loess

Loveland loess

Depth 

Range

(cm)

0-25

25-50

50-60

60-70

70-83

83-100

100-110

100-125

125-135

135.-145

145-155

155-165

165-400

400

420

440

460

480

500-520

520-538

538-555

555-565

565-578

578-590

590-600

600-630

630-650

650-685

685-705

705-720

Depth 

(m)

0.

0.

0.

0.

0.

0,

1.

1.

1.

1.

1.

1,

4.

4

4,

4.

4.

5.

5.

5,

5,

5,

5

5,

6.

6

6,

6.

7,

13

38

55

65

77

92

05

,13

.30

.40

.50

.60

.00

.20

.40

.60

.80

.10

.29

.47

.50

.72

.84

.95

.15

.40

,68

.95

.13

Mass

(g)

4.

4.

3.

4.

4.

4.

4.

3.

4.

4.

4.

4.

3.

3.

3.

4.

4.

3.

3.

4,

3.

3.

4.

4.

4.

4.

4.

4.

4.

1495

1063

7401

1332

0215

1697

1693

9757

1885

2448

2097

2517

7834

8533

9835

.1537

2348

6324

7679

0276

7383

.9146

,1936

,3171

1695

1674

4823

4029

6144

1.

1.

LFMS 

(m3/kg)

1902E-06

0986E-06

8.6548E-07

8.

7.

7.

7.

7.

7.

7.

7.

7.

8.

8.

9.

1177E-07

8798E-07

8658E-07

8413E-07

9298E-07

6127E-07

.7764E-07

.8081 E-07

.6196E-07

.3368E-07

.2834E-07

.0282E-07

8.6065E-07

8.

8.

9.

9.

9.

8,

9.

9.

7.

8.

8.

8.

8.

3408E-07

.9602E-07

2716E-07

2666E-07

2106E-07

3784E-07

,4691 E-07

7222E-07

8964E-07

4130E-07

9433 E-07

7336E-07

.2516E-07

1.

1.

8.

7.

7.

7.

7.

7,

7.

7.

7,

7

8.

8

8.

HFMS 

(m3/kg)

1517E-06

0630E-06

4354E-07

9277E-07

7064E-07

7043E-07

.6710E-07

7304E-07

,4651 E-07

.6130E-07

.6469E-07

.4585E-07

.1831 E-07

.1527E-07

.8395E-07

8.4195E-07

8.

8.

8.

8

8

8,

9

9,

7,

8

8

8

8.

.1449E-07

.6941 E-07

.9711 E-07

.9618E-07

.9732E-07

.1746E-07

.2782E-07

.5260E-07

7357E-07

.2565E-07

7684E-07

.5292E-07

.0541 E-07

FDMS %FDM 

(m3/kg)

3.

3.

2.

1.

1.

1.

1.

1.

1.

1.

1,

1

1,

1,

1.

1,

1,

2,

3.

3

2

2

1

1.

1,

1,

1.

2.

1.

8461 E-08

5683E-08

1940E-08

9002E-08

7343E-08

6154E-08

7029E-08

.9945E-08

.4761 E-08

,6341 E-08

.6120E-08

.6108E-08

.5378E-08

.3077E-08

.8865E-08

.8697E-08

.9585E-08

.6604E-08

.0049E-08

.0483E-08

.3732E-08

.0384E-08

.9088E-08

.9619E-08

.6064E-08

.5650E-08

7494E-08

.0435E-08

.9744E-08

3.23

3.25

2.54

2.34

2.20

2.05

2.17

2.52

1.94

2.10

2.06

2.11

1.84

1.58

2.09

2.17

2.35

2.97

3.24

3.29

2.58

2.43

2.02

2.02

2.03

1.86

1.96

2.34

2.39

19
Table 1. Sediment Magnetic Data from the McCook Localities, Red Willow County, Nebraska

Sample No.

Modern Soil 

Locality, About 2 

kmNWof

ARM 

(Am2/kg)

IRM1.2T 

(Am2/kg)

IRM-0.3T 

(Am2/kg)

HIRM 

(Am2/kg)

S ARM/M 

(A/m)

McCook, NE

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE 530

18

19

20

21

22

23

24

25

26

27

28

29

3.

3.

2.

2.

1.

1.

2.

1.

1.

1.

1.

1.

1136E-04

0806E-04

1930E-04

0227E-04

8879E-04

9219E-04

,3764 E-04

,9452E-04

7885E-04

,8229E-04

,8231 E-04

7186E-04

1.

1.

8.

8.

8.

8.

8.

8,

7.

8.

8.

7.

1542E-02

0734E-02

6655E-03

3109E-03

0816E-03

,1321 E-03

.1453E-03

.2124E-03

.9909E-03

.1347E-03

.1119E-03

.9215E-03

-1. 0777E-02

-1*0035E-02

-8.

-7.

-7.

-7.

-7.

-7.

-7.

-7.

-7.

-7.

11 21 E-03

7712E-03

5295E-03

5681 E-03

5696E-03

61 51 E-03

.4155E-03

5528E-03

,5695E-03

3500E-03

3.

3.

2.

2.

2.

2.

2.

2.

2.

2.

2.

2.

8234E-04

4950E-04

7673E-04

,6983E-04

7602E-04

,8200E-04

.8782E-04

.9862E-04

.8769E-04

.9094E-04

7118E-04

.8577E-04

0.93

0.93

0.94

0.94

0.93

0.93

0.93

0.93

0.93

0.93

0.93

0.93

261.6

280.4

253.4

249.2

239.6

244.3

303.1

245.3

234.9

234.4

233.5

225.6

Borrow Pit

Locality, about

1.5kmSWof

McCook, NE

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

NE530

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

1

2

2

2

2

3

3

3

2

2

2

2.

2

1

2

2.

1.

.9650 E-04

.0447E-04

.4679E-04

.6242E-04

.6566E-04

.1788 E-04

.3654E-04

.2868E-04

.8938E-04

.3738E-04

.5263E-04

.3958E-04

.1613E-04

.9519E-04

.0754E-04

.0149E-04

.9588E-04

8

8

9

9

9,

9,

9

9

9

8

9

1

8

8

9

8

8,

.6063E-03

J553E-03

J226E-03

.4639E-03

.1433E-03

.4742E-03

J752E-03

.6403E-03

.4112E-03

.6060E-03

J185E-03

.0013E-02

.1988E-03

.6604E-03

.1418E-03

.6648E-03

.4338E-03

-7,

-8

-9,

-8

-8

-8

-9

-8

-8

-7

-9,

-9,

-7,

-7

-8

-8.

-7.

.9770E-03

.11 51 E-03

.0046E-03

.7657E-03

.4325E-03

.7403E-03

.0607E-03

.9287E-03

.7371 E-03

.9635E-03

.0164E-03

.2705E-03

.5874E-03

.9859E-03

.4709E-03

.0127E-03

.7760E-03

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

3

.1463E-04

.2009E-04

.5898 E-04

.4909E-04

.5539E-04

.6696E-04

.5724E-04

.5581 E-04

.3707E-04

.2123E-04

.5103E-04

.7124E-04

.0569E-04

.3729E-04

.3547E-04

.2607E-04

.2886E-04

0.93

0.93

0.93

0.93

0.92

0.92

0.93

0.93

0.93

0.93

0.93

0.93

0.93

0.92

0.93

0.92

0.92

235.7

246.8

273.4

304.9

318.5

354.8

363.0

354.7

314.2

283.3

266.8

246.4

273.7

232.0

232.1

230.7

237.4

IRM/MS

(A/m)

9698

9770

10012

10238

10256

10338

10388

10356

10497

10461

10389

10396

10323

10570

10769

10996

10962

10574

10543

10403

10218

10272

10263

10299

10383

10294

10222

9921

10221

MS/SIRM

(m/A)

1.0312E-04

1.0235E-04

9.9876E-05

9.7676E-05

9.7503E-05

9.6726E-05

9.6268E-05

9.6559E-05

9.5267E-05

9.5596E-05

9.6256E-05

9.6188E-05

9.6869E-05

9.461 1E-05

9.2857E-05

9.0941 E-05

9.1223E-05

9.4575E-05

9.4848E-05

9.6123E-05

9.7868E-05

9.7356E-05

9.7434E-05

9.7096E-05

9.6311 E-05

9.7143E-05

9.7829E-05

1.0079E-04

9.7840E-05

20
Table 2. Magnetic Susceptibility vs. Temperature Data from the McCook 

Localities, Red Willow County, Nebraska.

Sample No: A unique number assigned to loess and/or sediment samples.

Heating time (sec): The time in seconds during the progressive heating 

experiment.

Heating susceptibility: The raw susceptibility value (x 10"6 SI) for the sample 

during the progressive heating experiment.

Heating susceptibility corrected: The corrected susceptibility value (x 10~6 SI) 

during progressive heating after subtracting out the diamagnetic effects of the 

quartz tube and A^Oa powder.

Cooling time (sec): The time in seconds during the progressive cooling of the 

sample following the attainment of peak heating temperatures.

Cooling susceptibility: The raw susceptibility value (x 10"6 SI) for the sample 

during progressive cooling.

Cooling susceptibility corrected: The corrected susceptibility value (x 10"6 SI) 

during cooling after subtracting out the diamagnetic effects of the quartz tube 

and AI2O3 powder.

21
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample 

No.

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Heating 

Time

0

19

36

52

69

86

103

120

136

153

170

187

204

221

237

254

271

288

304

321

338

355

371

388

405

421

438

455

471

488

505

521

538

555

571

588

605

621

638

654

671

687

704

720

737

753

770

786

803

Heating 

Temperature 

(°C) 

21.60

22.60

25.90

29.90

34.20

39.00

43.80

48.80

53.40

57.70

62.00

66.40

70.70

75.10

79.20

83.30-

87.20

91.10

95.00

98.80

102.50

106.10

110.00

113.40

117.10

121.00

124.70

128.70

132.40

136.30

140.00

144.00

147.70

151.70

155.50

159.20

163.00

166.70

170.80

174.50

178.60

182.60

187.00

191.30

195.20

199.50

203.60

208.00

211.90

Heating Heating 

Susceptibility Susceptibility 

(raw) (corrected)

475.5 616.5306

474.9

479.8

482.7

486.3

488.2

491.3

495.2

496.9

497.8

499.9

503.0

504.8

509.6

511.8

514.0

513.6

516.8

520.6

519.2

523.1

523.1

526.5

526.6

530.7

533.6

534.1

538.0

540.9

542.2

545.2

547.3

551.5

552.6

560.4

558.1

561.3

562.7

570.3

571.2

574.1

579.6

580.6

584.7

589.9

592.5

597.6

600.3

604.1

615.9387

620.8654

623.7977

627.4324

629.3712

632.5099

636.4503

638.1875

639.1222

641.2570

644.3925

646.2272

651.0628

653.2959

655.5291

655.1605

658.3921

662.2236

660.8543

664.7842

664.8132

668.2448

668.3722

672.5021

675.4336

675.9635

679.8958

682.8257

684.1572

687.1871

689.3195

693.5493

694.6816

702.5123

700.2422

703.4729

704.9028

712.5359

713.4658

716.3989

721.9313

722.9668

727.1016

732.3331

734.9678

740.1009

742.8364

746.6680

Cooling Cooling 

Time Temperature 

(°C) 

2683 672.7

2700

2718

2735

2752

2769

2786

2803

2820

2838

2855

2872

2889

2906

2923

2941

2958

2975

2992

3009

3027

3044

3061

3078

3095

3111

3127

3142

3158

3174

3190

3205

3221

3237

3252

3268

3284

3299

3317

3334

3351

3369

3386

3403

3420

3437

3454

3472

3489

671.2

669.4

667.2

664.7

661.1

657.9

654.6

651.0

647.5

643.9

640.7

636.8

632.9

628.7

624.5

620.2

615.7

611.5

607.3

603.2

599.0

594.5

590.4

586.3

582.5

578.4

574.7

571.0

567.2

563.8

559.8

556.1

552.4

548.4

544.4

540.7

536.7

532.1

528.1

523.8

519.6

515.6

511.7

507.8

503.9

499.7

495.5

491.6

Heating 

Susceptibility 

(raw) 

-146.6

-143.6

-145.5

-146.5

-144.8

-145.8

-145.0

-144.5

-145.5

-141.3

-144.5

-141.9

-143.4

-142.9

-139.4

-143.3

-140.7

-136.4

-138.9

-138.2

-136.0

-137.9

-130.4

-127.5

-119.2

-102.5

-81.5

-69.0

-61.1

-53.2

-43.7

-31.3

-17.6

-0.4

22.9

51.4

81.7

115.2

153.6

191.1

222.9

250.3

275.7

298.6

320.8

338.5

351.7

363.3

370.5

Cooling 

Susceptibility 

(corrected)

-0.3093

2.6785

0.7640

-0.2538

1.4260

0.3970

1.1711

1 .6445

0.6154

4.7871

1 .5580

4.1322

2.6006

3.0692

6.5352

2.6013

5.1666

9.4302

6.8963

7.5623

9.7292

7.7953

15.2589

18.1258

26.3927

43.0620

63.9989

76.5490

84.3391

92.2884

101.6709

114.1186

127.7287

144.9600

168.1565

196.6842

226.9043

260.3920

298.7548

336.2225

367.9877

395.3538

420.7215

443.5900

465.7585

483.4270

496.5931

508.1591

515.3276

22
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample 

No.

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Heating 

Time

819

836

853

869

886

903

919

936

953

969

986

1003

1019

1036

1053

1069

1086

1103

1119

1136

1153

1170

1187

1204

1221

1237

1254

1271

1288

1305

1321

1338

1355

1372

1389

1406

1423

1439

1456

1473

1490

1507

1524

1541

1558

1575

1592

1609

1626

Heating 

Temperature 

(°C)

216.00

219.90

224.00

227.90

231.80

235.90

239.90

243.80

247.70

251.90

255.80

259.80

263.70

267.70

272.00

276.20

280.80

284.80

289.40

293.40

297.40

301.70

306.10

310.10

314.20

318.30

322.70

326.70

331.10

335.60

339.70

343.80

348.00

352.10

356.30

360.40

364.60

368.80

373.00

377.50

381.80

386.30

390.50

394.80

399.10

403.70

407.60

411.90

416.20

Heating Heating 

Susceptibility Susceptibility 

(raw) (corrected)

604.4 747.001 1

608.2

614.5

614.3

617.2

620.5

624.3

626.3

630.2

634.2

633.6

637.0

639.1

641.5

645.4 .

645.7

649.2

652.1

649.2

649.5

653.5

652.6

653.1

655.9

652.5

655.3

653.9

653.9

655.7

648.8

648.9

648.5

641.0

642.8

640.0

634.0

635.2

627.5

627.0

623.0

619.8

614.7

612.8

606.7

603.1

595.2

591.0

581.8

576.3

750.8326

757.1658

756.9973

759.9288

763.2618

767.0942

769.1257

773.0573

777.0911

776.5226

779.9550

782.0864

784.5188

788.4536

788.7875

792.3246

795.2569

792.3941

792.7264

796.7587

795.8934

796.4290

799.2614

795.8944

798.7275

797.3632

797.3954

799.2310

792.3673

792.5005

792.1335

784.6675

786.5006

783.7346

777.7677

779.0016

771.3356

770.8695

766.9058

763.7405

758.6769

756.8109

750.7456

747.1803

739.3175

735.1490

725.9837

720.5184

Cooling Cooling 

Time Temperature 

(°C)

3506 487.4

3523

3540

3558

3575

3592

3609

3626

3644

3661

3678

3695

3712

3729

3746

3763

3781

3798

3815

3832

3849

3866

3883

3900

3918

3935

3952

3969

3986

4003

4020

4037

4054

4071

4088

4105

4122

4139

4156

4173

4191

4208

4225

4242

4259

4276

4293

4310

4327

483.2

479.1

474.9

470.8

466.6

462.5

458.4

454.3

450.2

446.1

442.0

438.0

433.6

429.6

425.2

420.9

416.9

412.6

408.3

404.3

400.0

396.0

392.1

387.8

383.6

379.4

375.1

371.2

367.0

362.8

358.7

354.5

350.6

346.5

342.6

338.5

334.7

330.9

327.0

322.9

318.9

314.8

311.0

306.9

302.6

298.9

294.8

290.8

Heating 

Susceptibility 

(raw)

377.6

386.9

393.3

393.5

398.6

404.7

407.6

405.4

406.6

408.3

408.4

407.6

407.1

409.1

411.1

409.5

406.3

409.2

404.3

407.3

405.7

407.1

400.6

402.8

401.7

400.6

399.5

399.4

399.2

396.1

395.6

392.6

391.7

392.3

390.5

386.4

386.4

386.0

382.8

381.0

378.5

378.5

378.1

375.0

374.7

375.4

371.5

371.5

369.4

Cooling 

Susceptibility 

(corrected)

522.3937

531.6597

538.0266

538.1927

543.2596

549.3257

552.1925

549.9594

551.1263

552.7932

552.8600

552.0269

551.4946

553.4590

555.4268

553.7912

550.5564

553.4241

548.4894

551.4547

549.8223

551.1876

544.6553

546.8237

545.6890

544.5551

543.421 1

543.2864

543.0549

539.9210

539.3871

536.3539

535.4200

535.9885

534.1554

530.0239

529.9907

529.5601

526.3293

524.4979

521.9647

521.9324

521.4993

518.3686

518.0355

518.7007

514.7708

514.7377

512.6054

23
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample 

No.

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Heating 

Time

1643

1660

1677

1694

1711

1728

1745

1762

1779

1796

1813

1830

1847

1865

1882

1899

1916

1933

1950

1967

1984

2001

2018

2036

2051

2067

2082

2098

2113

2129

2144

2160

2175

2191

2207

2222

2238

2253

2272

2289

2306

2323

2340

2357

2374

2391

2408

2426

2443

Heating 

Temperature 

(°C)

420.60

424.90

429.20

433.60

438.60

443.00

447.70

452.10

456.50

460.90

465.40

470.10

474.60

479.10

483.50

488.0Q

492.60

496.80

501.30

505.80

510.10

514.70

519.20

523.50

527.10

531.10

534.70

538.70

542.70

546.70

550.70.

554.80

558.80

562.80

566.20

570.30

574.00

578.10

582.50

586.60

591.10

595.20

599.40

604.20

608.70

612.90

617.40

621 .60

625.90

Heating 

Susceptibility 

(raw)

569.8

563.0

555.7

545.6

536.1

524.8

515.6

504.6

491.1

481.0

465.4

448.3

429.5

413.4

396.0

370.2

346.2

319.0

289.7

259.4

229.0

194.0

162.2

129.8

111.8

89.9

70.5

51.5

30.0

9.6

-5.9

-21.3

-34.0

-45.1

-55.3

-65.2

-78.8

-99.7

-123.4

-130.6

-135.1

-136.4

-137.9

-137.3

-138.7

-140.7

-140.5

-141.7

-145.2

Heating 

Susceptibility 

(corrected)

714.0540

707.2888

700.0235

689.9590

680.4994

669.2350

660.0729

649.1085

635.6440

625.5796

610.0159

592.9539

574.1903

558.1266

540.7622

514.9985

491 .0357

463.8696

434.6060

404.3423

373.9771

339.0142

307.2506

274.8853

256.9144

235.0867

215.6358

196.7181

175.2304

154.8327

139.4181

124.0282

1 1 1 .3805

100.3528

90.1003

80.2434

66.6733

45.8164

22.1620

14.9951

10.5315

9.2646

7.7985

8.4373

7.0736

5.1076

5.3439

4.1779

0.7126

Cooling Cooling 

Time Temperature 

(°C) 

4344 286.5

4361

4378

4395

4412

4429

4446

4463

4480

4497

4514

4531

4548

4565

4582

4599

4616

4633

4650

4667

4684

4701

4718

4735

4752

4769

4786

4803

4820

4837

4854

4871

4888

4905

4922

4939

4956

4973

4989

5006

5023

5040

5057

5074

5091

5107

5124

5141

5158

282.5

278.5

274.5

270.5

266.6

262.6

258.9

255.0

250.8

246.8

242.9

238.7

234.6

230.4

226.5

222.3

218.2

214.1

210.2

206.1

202.3

198.4

194.6

190.8

187.0

183.2

179.7

175.9

172.1

168.6

164.8

161.1

157.6

153.9

150.4

146.9

143.5

140.0

136.6

132.9

129.5

126.0

122.6

119.2

115.8

112.4

109.3

105.9

Heating 

Susceptibility 

(raw) 

365.4

364.3

364.3

362.0

361.1

360.2

355.7

353.5

351.3

350.0

349.7

348.9

346.2

343.7

341.9

341.9

338.7

338.5

336.2

335.4

332.3

332.1

330.2

328.8

326.8

326.9

325.9

323.3

322.0

320.6

319.8

318.1

317.9

316.8

315.2

314.4

314.1

313.0

312.5

310.9

309.6

308.3

307.6

308.2

307.9

307.5

306.3

306.9

305.9

Cooling 

Susceptibility 

(corrected)

508.5706

507.4383

507.4060

505.0737

504.1414

503.2099

498.6776

496.4477

494.2162

492.8823

492.5499

491.7184

488.9845

486.4514

484.6174

484.5859

481.3520

481.1189

478.7858

477.9542

474.8211

474.5905

472.6589

471.2282

469.1975

469.2668

468.2361

465.6078

464.2772

462.8464

462.0182

460.2875

460.0576

458.9293

457.2994

456.471 1

456.1429

455.0154

454.4871

452.8596

451.5298

450.2023

449.4740

450.0466

449.7191

449.2916

448.0641

448.6391

447.6116

24
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample 

No.

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

N e530-1 8

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-18

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Heating 

Time

2460

2477

2494

2511

2529

2546

2563

2580

2597

2614

2632

2649

2666

0

18

33

49

64

80

95

110

126

142

157

172

188

203

219

234

249

265

280

296

311

327

342

357

Heating 

Temperature 

(°C) 

630.40

635.00

639.60

643.90

648.20

652.80

657.10

661.10

665.40

669.00

671.60

672.70

673.00

:

21.40

22.40

25.70

29.70

34.20

38.70

43.00

47.30

51.60

55.90

59.80

63.60

67.70

71.50

75.40

79.00

82.60

85.90

89.30

92.60

95.70

99.40

102.50

105.90

Heating 

Susceptibility 

(raw)

-142.5

-143.0

-144.4

-144.9

-141.9

-143.8

-147.1

-147.3

-145.0

-145.1

-144.5

-143.9

-143.6

12.5

12.9

12.7

13.3

14.4

14.9

15.9

16.2

17.0

17.9

18.5

19.0

20.0

20.2

20.6

21.2

21.8

22.3

23.2

23.3

24.2

24.4

24.6

25.3

Heating 

Susceptibility 

(corrected)

3.4489

2.9861

1.6233

1.1580

4.1927

2.3299

-0.9354

-1.1030

1.2317

1.1608

1.7818

2.3907

2.6931

153.5390

153.9271

153.7737

154.4160

155.5324

156.0887

157.1035

157.4782

158.2830

159.2277

159.8492

160.3399

161.3830

161.6337

162.1052

162.7243

163.3334

163.8801

164.7775

164.9042

165.8292

166.0591

166.2842

167.0116

Cooling Cooling 

Time Temperature 

(°C)

5174 102.5

5191

5208

5225

5241

5258

5275

5292

5308

5325

5342

5358

5375

5391

5408

5425

5442

5458

5475

5491

5508

5524

5541

5557

2733

2750

2767

2784

2801

2818

2835

2852

2869

2886

2904

2921

2938

2955

2972

2989

3006

3023

3040

3057

3074

3092

3109

3126

99.1

96.0

92.6

89.5

86.4

83.1

80.2

77.2

74.3

71.5

68.9

66.1

63.6

61.0

58.7

56.2

53.4

50.6

48.1

45.5

43.5

41.5

39.5

674.1

673.4

671.9

670.1

667.6

665.1

661.8

658.9

655.3

652.1

648.5

644.6

640.7

636.8

632.6

628.3

624.5

620.2

616.0

611.9

608.0

603.9

600.1

595.9

Heating 

Susceptibility 

(raw)

305.1

305.7

304.0

301.9

303.0

303.4

301.6

302.0

303.2

302.5

300.0

301.0

300.6

300.7

299.8

299.8

299.5

299.0

298.6

298.2

298.0

297.7

297.1

296.8

-144.0

-153.5

-150.3

-146.6

-148.9

-147.5

-154.7

-151.0

-150.5

-146.8

-145.5

-155.4

-150.7

-148.4

-148.0

-148.2

-146.5

-148.0

-143.0

-142.4

-146.7

-144.2

-143.2

-142.9

Cooling 

Susceptibility 

(corrected)

446.7842

447.3567

445.6317

443.5042

444.5792

444.9541

443.1274

443.5040

444.6798

443.9564

441.4337

442.4127

441.9901

442.0699

441.1489

441.1303

440.8101

440.2875

439.8649

439.4447

439.2237

438.9075

438.2914

437.9752

2.3020

-7.2037

-4.0158

-0.3303

-2.6505

-1.2707

-8.4974

-4.8208

-4.3499

-0.6758

0.5952

-9.3363

-4.6678

-2.3994

-2.0333

-2.2680

-0.5987

-2.1335

2.8326

3.3995

-0.9320

1.5349

2.5042

2.7702

25
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Heating

Time

373

388

404

419

435

450

465

481

496

512

527

543

558

573

589

604

620

635

650

666

681

696

712

727

743

758

773

789

804

819

835

850

866

881

897

912

927

943

958

974

989

1004

1020

1035

1051

1066

1081

1097

1112

Heating

Temperature

(°C)

109.30

112.70

116.30

120.00

123.40

126.60

130.00

133.40

136.90

140.30

143.80

146.90

150.70

154.10

157.60

161.1Q

164.30

167.80

171.30

174.80

178.30

182.10

185.90

189.40

193.20

196.80

200.60

204.40

208.00

211.60

215.40

219.00

222.90

226.50

230.10

234.00

237.60

241.20

244.90

248.50

252.50

256.10

259.80

263.70

267.70

271.70

275.40

279.40

283.10

Heating

Susceptibility

(raw)

25.8

26.4

26.3

27.2

28.0

28.0

28.6

29.6

29.5

30.0

31.3

31.8

32.0

32.9

34.1

34.3

35.1

35.8

36.0

36.8

37.0

38.3

38.7

39.3

40.4

41.1

42.6

42.8

43.0

44.2

45.2

45.6

46.5

46.8

48.0

48.3

49.0

49.9

50.1

51.1

51.5

52.0

52.3

53.1

53.3

54.2

54.3

54.0

54.1

Heating

Susceptibility

(corrected)

167.5291

168.1666

168.1357

168.9755

169.8230

169.8789

170.5163

171.5138

171.4621

172.0096

173.3078

173.8529

174.0636

175.0110

176.1793

176.4776

177.2534

177.9817

178.2600

179.0683

179.3065

180.5972

181.0979

181.7062

182.8069

183.5160

185.1167

185.2874

185.4865

186.7556

187.7563

188.1953

189.1768

189.4759

190.6650

191.0365

191.7856

192.6547

192.9646

193.9137

194.3560

194.9451

195.2150

196.0865

196.3388

197.2511

197.3810

197.0833

197.2832

Cooling

Time

3143

3160

3177

3194

3211

3228

3245

3262

3279

3296

3313

3329

3344

3360

3375

3391

3406

3421

3437

3453

3468

3483

3499

3514

3530

3545

3561

3576

3591

3607

3622

3637

3653

3668

3684

3699

3714

3730

3745

3760

3776

3791

3807

3822

3837

3853

3868

3883

3899

Cooling

Temperature

(°C)

592.1

588.0

583.6

579.5

575.4

571.3

567.6

563.5

559.1

555.1

551.1

547.4

543.7

540.1

536.7

532.8

529.1

525.2

521.2

517.3

513.7

510.1

506.5

502.9

499.4

495.5

491.9

488.0

484.5

480.7

477.1

473.3

469.8

466.3

462.5

458.7

454.9

451.1

447.4

443.6

439.8

436.1

432.4

428.9

425.2

421.5

418.1

414.1

410.7

Heating

Susceptibility

(raw)

-141.1

-140.5

-135.5

-135.0

-134.8

-133.7

-130.2

-130.7

-127.7

-123.9

-118.1

-115.2

-110.5

-105.2

-100.3

-95.0

-89.2

-83.2

-77.6

-71.8

-67.3

-63.2

-58.7

-55.8

-54.0

-51.7

-50.2

-49.2

-48.5

-47.7

-47.4

-47.2

-46.8

-46.8

-46.2

-46.1

-46.4

-46.0

-46.4

-46.6

-47.0

-47.1

-47.2

-47.5

-47.6

-47.7

-48.1

-48.9

-49.5

Cooling

Susceptibility

(corrected)

4.5395

5.1064

10.0709

10.5377

10.7046

11.7715

15.2416

14.7085

17.6729

21.4406

27.2083

30.0784

34.7485

40.0194

44.8920

50.1505

55.9106

61.8691

67.4267

73.2152

77.7062

81.7671

86.2380

89.1589

90.9206

93.1691

94.6700

95.5885

96.2703

97.0496

97.2905

97.4698

97.8815

97.8732

98.3825

98.4918

98.1311

98.5404

98.1005

97.8698

97.4391

97.2692

97.1194

96.8011

96.7012

96.5613

96.1838

95.3515

94.6941

26
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Heating

Time

1128

1143

1158

1174

1189

1204

1219

1235

1250

1265

1281

1296

1311

1327

1342

1357

1373

1388

1403

1418

1433

1448

1464

1479

1494

1509

1524

1540

1555

1570

1585

1600

1615

1630

1645

1661

1676

1691

1706

1721

1736

1751

1766

1781

1796

1811

1827

1842

1857

Heating

Temperature

ro

286.80

290.50

294.30

298.00

301.70

305.50

309.00

312.70

316.20

320.00

323.80

327.60

331.40

335.30

339.10

342.9Q

347.10

350.60

354.50

358.10

361.90

365.50

369.40

373.30

377.20

381.20

385.10

388.70

392.40

396.30

400.30

404.30

408.30

411.90

415.90

419.30

423.00

426.80

430.80

434.50

438.30

442.00

445.50

449.20

452.70

456.50

460.00

463.80

467.30

Heating

Susceptibility

(raw)

54.3

54.3

54.4

54.3

54.0

53.7

54.3

53.9

53.8

53.4

53.1

53.4

52.7

52.4

52.3

52.0

50.8

50.3

49.9

49.4

48.7

47.7

46.7

46.6

46.0

44.5

43.9

42.5

41.6

40.5

39.1

37.7

36.9

34.8

32.7

31.9

29.4

27.8

25.2

22.9

20.2

18.2

16.3

15.0

11.3

8.4

6.2

3.4

1.0

Heating

Susceptibility

(corrected)

197.4931

197.4530

197.6537

197.5836

197.2635

197.0642

197.6024

197.2823

197.1806

196.8813

196.5520

196.89,27

196.2134

196.0049

195.8556

195.6563

194.4502

193.9685

193.6300

193.1391

192.4398

191.4889

190.5804

190.4719

189.8734

188.4457

187.8772

186.4863

185.6562

184.5577

183.2300

181.8623

181.0746

178.9837

176.9061

176.1035

173.6534

172.1141

169.4964

167.2963

164.6070

162.6169

160.7552

159.4551

155.8134

152.9180

150.7973

148.0230

145.6593

Cooling

Time

3914

3929

3945

3960

3976

3991

4006

4022

4037

4052

4068

4083

4099

4114

4129

4145

4160

4175

4191

4206

4222

4237

4252

4268

4283

4298

4314

4329

4344

4360

4375

4390

4406

4421

4437

4452

4467

4482

4498

4513

4528

4543

4558

4574

4589

4604

4619

4634

4650

Cooling

Temperature

(°C)

406.7

403.3

399.4

395.7

392.1

388.4

384.5

380.9

376.9

373.3

369.4

365.8

362.2

358.7

355.1

351.5

348.0

344.4

340.9

337.3

333.5

330.0

326.5

322.9

319.4

315.9

312.5

309.0

305.2

301.7

298.0

294.3

290.5

286.8

283.4

279.9

276.5

272.8

269.4

266.0

262.6

259.2

255.6

252.2

248.5

245.2

241.8

238.2

234.6

Heating

Susceptibility

(raw)

-49.9

-49.4

-50.1

-50.2

-50.7

-50.8

-51.9

-51.6

-52.2

-52.4

-52.4

-53.0

-53.0

-53.6

-53.9

-53.7

-54.3

-54.2

-54.7

-55.3

-55.4

-55.6

-56.1

-56.2

-56.2

-56.3

-56.4

-57.0

-57.6

-57.3

-57.7

-57.5

-57.9

-58.6

-58.4

-58.7

-58.7

-58.6

-59.0

-59.2

-59.4

-59.4

-59.4

-60.2

-59.9

-60.5

-60.7

-60.6

-61.0

Cooling

Susceptibility

(corrected)

94.2317

94.7443

94.0128

93.8729

93.3238

93.2239

92.0824

92.3133

91.7010

91.4419

91.4304

90.8213

90.7822

90.1640

89.8649

89.9758

89.3775

89.4284

88.9501

88.3311

88.2004

87.9721

87.4338

87.3047

87.2565

87.0682

87.0207

86.3924

85.6917

85.9635

85.5336

85.7637

85.2630

84.5731

84.7256

84.4073

84.3799

84.4300

84.0125

83.7951

83.5776

83.5101

83.4810

82.7436

83.0037

82.3770

82.1495

82.1805

81.8014

27
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Heating

Time

1872

1887

1902

1918

1933

1948

1963

1978

1993

2009

2024

2040

2055

2070

2085

2101

2116

2131

2146

2162

2177

2192

2208

2223

2238

2256

2273

2290

2307

2324

2341

2358

2375

2392

2408

2425

2442

2460

2476

2493

2510

2528

2545

2562

2579

2596

2613

2630

2647

Heating

Temperature

(°C)

471.10

474.90

478.70

482.60

486.40

490.00

493.90

497.70

501.90

506.20

510.10

514.00

517.90

521.90

525.80

529.8a

533.80

537.70

541.10

544.70

548.70

552.40

556.40

560.10

563.80

568.20

572.30

576.70

580.80

584.90

589.40

593.80

598.30

602.50

607.00

611.50

616.00

620.20

624.80

629.40

634.00

637.90

642.10

646.40

650.30

654.60

658.90

662.90

666.90

Heating

Susceptibility

(raw)

-3.1

-5.6

-9.3

-12.9

-16.3

-20.1

-23.7

-28.3

-32.8

-37.6

-43.2

-49.0

-54.9

-60.9

-65.6

-72.9

-76.7

-82.6

-86.3

-91.6

-96.6

-100.9

-104.8

-108.1

-112.7

-120.5

-123.4

-125.3

-130.2

-132.9

-136.5

-142.2

-143.5

-143.0

-144.5

-141.5

-147.8

-146.8

-144.8

-148.6

-148.4

-147.9

-147.5

-148.9

-150.5

-150.9

-148.9

-153.2

-148.6

Heating

Susceptibility

(corrected)

141.5870

139.0997

135.4104

131.8949

128.4856

124.7547

121.1762

116.5969

112.1408

107.3056

101.7771

96.0286

90.1801

84.2024

79.5339

72.2162

68.4285

62.6101

58.9475

53.6466

48.7189

44.4188

40.5511

37.2810

32.7109

24.9464

22.0796

20.2151

15.3482

12.6814

9.1177

3.4533

2.1896

2.7235

1 .2599

4.2962

-1 .9674

-0.9335

1.1037

-2.6591

-2.4220

-1.8905

-1.4565

-2.8218

-4.3903

-4.7555

-2.7208

-6.9885

-2.3562

Cooling

Time

4665

4680

4695

4710

4725

4741

4756

4771

4786

4801

4816

4832

4847

4862

4877

4892

4907

4922

4937

4952

4967

4982

4997

5012

5027

5042

5057

5072

5087

5102

5117

5132

5147

5162

5178

5193

5208

5223

5238

5253

5269

5284

5299

5315

5330

5345

5360

5376

5391

Cooling

Temperature

(°C)

230.9

227.6

224.3

220.7

217.4

213.8

210.5

206.9

203.6

200.3

197.1

193.8

190.5

187.3

184.0

180.8

177.2

174.0

171.0

167.8

164.6

161.4

158.1

154.9

151.7

148.5

145.6

142.4

139.5

136.3

133.2

130.0

127.1

123.9

120.8

117.9

114.7

111.6

108.7

105.6

102.5

99.4

96.5

93.4

90.6

87.7

84.6

81.8

79.2

Heating

Susceptibility

(raw)

-60.8

-61.3

-61.3

-61.7

-61.5

-61.8

-61.8

-62.5

-62.2

-62.0

-62.8

-62.3

-62.9

-62.5

-62.5

-63.5

-62.8

-63.4

-63.4

-63.4

-63.5

-63.6

-64.0

-63.8

-64.0

-63.8

-64.1

-64.3

-64.3

-64.4

-64.2

-64.8

-64.4

-64.3

-64.3

-64.8

-64.3

-64.7

-64.8

-64.6

-64.9

-64.7

-64.7

-64.6

-64.6

-64.7

-65.2

-64.9

-65.1

Cooling

Susceptibility

(corrected)

81.9015

81.3648

81.3582

80.9691

81.1224

80.7533

80.7267

80.0476

80.3109

80.5043

79.6684

80.1718

79.5051

79.9193

79.8026

78.8467

79.4777

78.9018

78.8576

78.8617

78.6759

78.5800

78.1334

78.3575

78.0416

78.2758

77.9124

77.7365

77.6531

77.5272

77.7522

77.1463

77.4829

77.5171

77.4920

77.0586

77.4827

77.0577

76.9243

77.1592

76.8242

76.9991

76.9057

76.9807

76.9680

76.8646

76.3596

76.6269

76.4059

28
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-2

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Heating

Time

2664

2681

2699

2715

0

17

32

48

63

79

94

110

125

141

156

172

187

203

218

234

249

265

280

296

311

327

342

358

373

389

404

420

435

451

466

482

497

512

528

544

559

574

Heating

Temperature

(°C)

670.10

672.70

674.10

674.80

21.90

22.60

25.40

29.40

33.70,

38.20

42.50

46.80

50.90

55.20

59.00

63.10

66.90

70.70

74.60

78.20

81.80

85.10

88.50

91.60

95.00

98.10

101.40

104.60

108.00

111.30

114.70

118.40

121.80

125.20

128.70

132.10

135.50

139.00

142.40

145.90

149.30

153.10

Heating

Susceptibility

(raw)

-152.1

-147.2

-149.4

-152.2

92.6

92.5

94.0

94.5

95.4

95.8

97.0

97.4

98.0

98.2

98.8

99.2

99.4

99.9

100.3

100.5

101.2

101.2

101.9

102.4

102.8

102.9

103.4

103.6

104.1

104.9

105.2

105.9

107.0

107.5

108.9

109.2

110.1

111.0

112.5

113.6

114.0

115.2

Heating

Susceptibility

(corrected)

-5.8303

-0.9093

-3.0980

-5.8924

233.6230

233.5587

235.0113

235.5436

236.5284

236.9147

238.1694

238.6142

239.2773

239.5220

240.1028

240.5759

240.7666

241.3573

241.7588

241.9879

242.7169

242.7436

243.471 1

243.9961

244.4236

244.5486

245.0753

245.3011

245.8286

246.6553

246.9827

247.7126

248.8401

249.3676

250.7958

251.1233

252.0508

252.9790

254.5065

255.6348

256.0623

257.2930

Cooling

Time

5406

5421

5436

5452

5467

5482

5498

5513

5529

5544

2754

2771

2788

2805

2822

2839

2856

2873

2890

2907

2924

2941

2958

2975

2992

3009

3026

3043

3060

3077

3095

3112

3129

3146

3163

3180

3197

3214

3231

3248

3266

3282

3297

3313

3328

3344

3359

3375

Cooling

Temperature

(°C)

76.4

73.8

71.3

68.7

66.1

63.6

61.3

59.0

56.4

53.9

671.9

670.9

669.4

667.6

665.1

662.5

659.3

656.4

652.8

649.3

645.7

642.1

638.2

634.7

630.8

626.9

622.7

618.5

614.3

610.1

606.3

602.1

598.0

593.8

589.7

585.6

581.8

577.7

573.7

569.9

565.9

562.2

558.5

555.1

551.4

547.7

544.1

540.4

Heating

Susceptibility

(raw)

-64.9

-65.0

-65.1

-65.0

-65.1

-65.3

-65.2

-65.4

-65.3

-65.2

-151.2

-150.1

-149.9

-149.3

-149.7

-150.7

-149.7

-150.6

-150.0

-149.2

-149.3

-149.4

-148.0

-150.2

-150.0

-149.7

-147.0

-146.9

-144.9

-144.7

-141.8

-143.5

-143.2

-139.9

-139.9

-134.0

-129.2

-124.6

-121.8

-122.2

-116.1

-115.2

-112.5

-109.0

-104.4

-98.8

-93.1

-86.9

Cooling

Susceptibility

(corrected)

76.6033

76.4123

76.3021

76.4611

76.2501

76.0799

76.1513

75.9728

76.0317

76.0715

-4.9158

-3.8239

-3.6360

-3.0505

-3.4707

-4.4917

-3.5176

-4.4410

-3.8701

-3.0984

-3.2275

-3.3565

-1.9880

-4.2163

-4.0478

-3.7793

-1.1133

-1.0472

0.9189

1.0849

3.9542

2.2203

2.4872

5.7533

5.7201

11.5870

16.3563

20.9232

23.6909

23.2602

29.3279

30.1980

32.8681

36.3406

40.9107

46.4808

52.1217

58.3419

29
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Heating

Time

590

605

620

636

651

667

682

697

713

728

744

759

774

790

805

821

836

852

867

882

898

913

931

948

965

982

999

1016

1033

1050

1067

1084

1101

1118

1135

1152

1168

1186

1202

1220

1237

1254

1271

1288

1305

1320

1336

1351

1366

Heating

Temperature

(°C)

156.30

159.80

163.20

166.70

170.20

173.70

177.20

180.80

184.50

188.10

191.60

195.40

199.20

203.10

206.60

210.2Q

213.80

217.60

221.20

224.80

228.70

232.30

236.50

240.40

244.30

248.50

252.50

256.40

260.30

264.30

268.60

272.80

276.80

281.40

285.60

289.40

293.40

297.70

301.70

305.80

310.10

314.50

318.30

322.40

326.70

330.60

334.40

338.20

341.70

Heating

Susceptibility

(raw)

115.9

117.0

117.8

118.5

119.3

120.2

120.9

121.8

122.6

123.6

125.1

125.8

126.7

128.1

129.1

129.5

130.4

131.6

132.4

133.1

133.8

135.0

135.9

136.7

136.9

138.9

139.0

138.4

138.1

140.7

139.6

140.5

138.1

143.3

139.8

140.8

138.9

137.1

136.9

137.8

139.2

138.3

138.0

136.7

137.3

137.2

137.1

135.7

135.3

Heating

Susceptibility

(corrected)

258.0188

259.1471

259.9745

260.7028

261.5311

262.4594

263.1877

264.1167

264.9466

265.9757

267.5040

268.2347

269.1654

270.5969

271.6252

272.0543

272.9833

274.2141

275.0431

275.7722

276.5037

277.7328

278.6667

279.4982

279.7297

281.7637

281.8960

281.3275

281.0590

283.6913

282.6260

283.5600

281.1923

286.4294

282.9634

283.9941

282.1264

280.3611

280.1935

281.1266

282.5613

281.6969

281.4276

280.1607

280.7954

280.7269

280.6577

279.2883

278.9166

Cooling

Time

3390

3406

3421

3437

3452

3468

3483

3499

3514

3530

3545

3561

3576

3592

3608

3623

3639

3654

3669

3685

3700

3716

3732

3747

3763

3778

3794

3809

3825

3840

3856

3871

3887

3903

3918

3934

3949

3965

3980

3995

4011

4026

4042

4057

4073

4088

4104

4119

4135

Cooling

Temperature

(°C)

536.7

533.1

529.5

525.8

522.2

518.3

514.3

510.4

506.8

503.2

499.7

496.1

492.6

488.7

484.8

481.3

477.5

473.9

470.1

466.6

463.1

459.3

455.9

452.1

448.3

444.8

441.1

437.7

433.9

430.2

426.4

422.7

419.0

415.3

411.6

407.6

404.3

400.6

396.9

393.3

389.6

386.0

382.4

378.7

375.1

371.2

367.6

364.0

360.4

Heating

Susceptibility

(raw)

-79.4

-72.2

-64.3

-56.8

-49.1

-41.2

-33.3

-26.9

-21.2

-16.9

-13.2

-10.7

-8.5

-6.2

-5.2

-3.6

-2.8

-2.9

-1.4

-1.2

-1.8

-0.9

-0.4

-1.4

-1.0

-0.9

-1.3

-1.6

-1.2

-1.6

-2.4

-2.7

-3.2

-3.7

-3.9

-3.6

-4.5

-5.1

-5.1

-5.7

-6.5

-6.7

-7.2

-7.3

-8.4

-8.3

-8.7

-9.1

-9.3

Cooling

Susceptibility

(corrected)

65.8320

72.9829

80.8438

88.3439

95.9348

103.8233

111.6810

118.0795

123.7504

128.0613

131.6931

134.1240

136.3527

138.6392

139.5837

141.1524

141.9077

141.8316

143.2199

143.4466

142.8064

143.6428

144.1563

143.0795

143.4628

143.5006

143.1186

142.8292

143.1595

142.6966

141.9349

141.5370

141.0711

140.4662

140.2523

140.5280

139.6483

139.0424

138.9406

138.3645

137.4706

137.2745

136.7944

136.5715

135.5254

135.5149

135.1479

134.7458

134.4297

30
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

N0530-3

Ne530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

N0530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

N0530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

N0530-3

Ne530-3

Ne530-3

N0530-3

Ne530-3

Ne530-3

N0530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Heating

Time

1381

1397

1412

1427

1442

1457

1472

1488

1503

1518

1533

1548

1564

1579

1594

1609

1624

1639

1654

1669

1684

1699

1714

1729

1744

1759

1775

1790

1805

1820

1835

1850

1865

1881

1896

1911

1926

1942

1957

1972

1988

2003

2018

2033

2049

2064

2080

2095

2110

Heating

Temperature

(°C)

345.90

349.40

353.30

356.90

360.40

364.00

367.90

371.50

375.40

379.00

383.00

386.60

390.20

393.90

397.50

401. 20i

405.20

409.20

412.90

416.60

420.30

424.30

428.00

431.40

435.50

439.20

443.30

447.00

450.50

454.30

458.10

461.90

465.70

469.80

473.60

477.10

481.00

484.80

488.70

492.20

496.10

500.00

503.90

507.50

511.10

515.00

518.60

522.20

526.50

Heating

Susceptibility

(raw)

134.2

133.8

132.5

131.8

130.8

130.4

129.0

128.6

127.5

126.8

125.6

124.8

123.5

122.5

121.1

119.6

118.2

116.3

114.8

112.8

110.6

108.1

105.3

103.3

100.3

97.1

93.9

90.9

87.7

84.4

80.6

76.9

72.2

67.9

63.2

58.1

53.2

47.6

42.3

37.3

30.9

23.6

16.5

9.8

2.1

-6.5

-14.3

-22.4

-31.7

Heating

Susceptibility

(corrected)

277.8505

277.4788

276.2103

275.5394

274.5677

274.1968

272.8282

272.4573

271.3889

270.7180

269.5503

268.7794

267.5084

266.5383

265.1674

263.6973

262.3296

260.4619

258.9918

257.0217

254.8516

252.3839

249.6138

247.6413

244.6744

241.5443

238.3374

235.4073

232.1756

228.9063

225.1970

221.4677

216.8184

212.5215

207.8622

202.8205

197.9820

192.3427

187.0942

182.1725

175.7140

168.4755

161.4370

154.7661

147.0732

138.5336

130.7857

122.6748

113.4296

Cooling

Time

4150

4166

4181

4197

4212

4228

4243

4258

4274

4289

4305

4320

4336

4351

4367

4382

4398

4413

4428

4444

4459

4475

4490

4505

4521

4536

4551

4567

4582

4597

4612

4628

4643

4658

4673

4689

4704

4719

4734

4749

4765

4780

4795

4810

4825

4840

4856

4871

4886

Cooling

Temperature

(°C)

356.6

353.0

349.4

345.9

342.3

339.1

335.6

331.7

328.2

324.7

320.9

317.4

313.9

310.4

306.9

303.5

300.0

296.6

292.8

289.4

285.9

282.2

278.8

275.4

272.0

268.6

265.2

261.8

258.4

254.7

251.3

248.0

244.3

241.0

237.6

234.0

230.7

227.1

223.7

220.4

217.1

213.8

210.2

207.2

203.9

200.6

197.3

194.3

191.1

Heating

Susceptibility

(raw)

-9.9

-10.6

-10.4

-10.8

-11.4

-11.5

-12.1

-12.3

-12.7

-12.9

-13.5

-13.3

-14.0

-14.1

-14.4

-15.0

-15.1

-15.5

-16.0

-15.9

-16.2

-16.4

-16.7

-17.0

-17.1

-17.7

-18.0

-18.2

-18.4

-18.3

-19.0

-19.0

-19.4

-19.7

-19.8

-20.4

-19.9

-20.2

-20.6

-20.9

-20.6

-21.4

-21.3

-21.5

-21.6

-21.7

-21.6

-22.0

-22.1

Cooling

Susceptibility

(corrected)

133.8140

133.1479

133.2388

132.8505

132.2615

132.1156

131.4373

131.2158

130.8175

130.5493

129.9286

130.1103

129.3720

129.2737

128.9155

128.3080

128.2097

127.7423

127.2716

127.3441

126.9758

126.7159

126.3784

126.0610

126.0035

125.3060

124.9786

124.7811

124.5136

124.6638

123.9163

123.9096

123.4597

123.1231

122.9556

122.3465

122.8599

122.4508

122.1033

121.7167

122.0300

121.2033

121.2742

121.0100

120.9334

120.7867

120.8200

120.4758

120.3100

31
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Heating

Time

2126

2141

2157

2172

2187

2203

2218

2233

2249

2264

2280

2295

2310

2327

2344

2362

2378

2396

2413

2430

2447

2464

2481

2498

2515

2532

2549

2566

2583

2600

2617

2634

2651

2668

2685

2703

2720

2737

Heating

Temperature

(°C)

530.10

534.10

538.10

541.70

545.70

549.10

552.40

556.40

559.80

563.50

567.60

571.60

575.40

579.80

584.20

589.00,

593.50

598.00

602.10

606.60

611.20

615.00

619.20

623.40

628.00

632.20

636.40

640.30

644.30

648.50

652.50

656.40

660.00

664.00

666.90

669.40

671.20

671.90

Heating

Susceptibility

(raw)

-40.4

-47.2

-54.6

-61.1

-67.7

-74.1

-79.4

-85.1

-90.9

-95.6

-100.6

-105.3

-110.7

-121.3

-128.1

-135.1

-138.5

-137.2

-139.8

-142.0

-144.7

-146.7

-146.3

-147.9

-147.8

-147.1

-149.0

-147.0

-150.6

-148.9

-151.2

-149.1

-150.9

-149.4

-152.2

-151.1

-149.8

-149.7

Heating

Susceptibility

(corrected)

104.7486

97.9310

90.6533

84.1524

77.6147

71.2222

65.9588

60.3011

54.4486

49.8185

44.8416

40.1739

34.8046

24.2402

17.4757

10.5145

7.1508

8.4872

5.9203

3.7567

1.0938

-0.8755

-0.4415

-2.0076

-1.8705

-1.1365

-3.0026

-0.9711

-4.5388

-2.8048

-5.0725

-2.9410

-4.7119

-3.1796

-5.9562

-4.8360

-3.5215

-3.4158

Cooling

Time

4901

4917

4931

4947

4962

4977

4992

5007

5022

5037

5052

5067

5082

5097

5112

5127

5142

5157

5172

5187

5202

5217

5232

5247

5262

5277

5292

5307

5322

5338

5352

5368

5383

5398

5413

5428

5443

5458

5473

5488

5503

5519

5534

5549

5564

5580

5595

5610

5625

Cooling

Temperature

(°C)

187.8

184.5

181.6

178.3

175.1

171.8

168.6

165.4

162.4

158.9

156.0

152.8

149.6

146.7

143.5

140.6

137.7

134.7

131.6

128.7

125.5

122.6

119.7

116.6

113.7

110.8

108.0

104.8

101.7

98.6

95.7

92.9

90.0

87.2

84.4

81.5

78.7

76.1

73.6

71.0

68.7

66.1

63.8

61.5

59.2

57.0

54.4

51.9

49.6

Heating

Susceptibility

(raw)

-22.0

-22.1

-22.7

-22.4

-22.7

-23.1

-23.1

-23.2

-23.3

-23.6

-23.7

-23.7

-23.7

-23.7

-23.9

-24.0

-24.2

-24.1

-24.5

-24.4

-24.3

-24.7

-24.6

-24.6

-24.4

-24.8

-24.8

-24.8

-24.5

-24.9

-25.0

-24.6

-24.4

-24.4

-24.4

-24.3

-24.6

-24.6

-24.5

-24.6

-24.4

-24.4

-24.6

-24.6

-24.6

-24.7

-24.7

-24.7

-24.8

Cooling

Susceptibility

(corrected)

120.3333

120.2266

119.6232

119.8865

119.5707

119.1340

119.1082

119.0323

118.9181

118.5698

118.3764

118.4405

118.3847

118.3112

118.0954

118.0420

117.8185

117.8943

117.4693

117.5358

117.6000

117.1165

117.2331

117.2181

117.3546

116.9512

116.9186

116.9427

117.1577

116.7927

116.6492

116.9966

117.1632

117.2006

117.1580

117.2145

116.9419

116.8309

116.9307

116.8597

117.0211

117.0101

116.8215

116.7429

116.7044

116.6366

116.6456

116.5454

116.4568

32
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

Ne530-3

Ne530-3

Ne530-3

Ne530-3

Ne530-3

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

Heating

Time

0

16

32

47

63

78

93

109

124

139

155

170

185

201

216

231

247

262

277

293

308

324

339

354

370

385

400

416

431

446

461

477

492

508

523

538

553

569

584

600

615

630

646

Heating

Temperature

(°C)

27.90

28.70

30.90

34.40

38.00

42.30

46.30

50.40

54.20

58.20?

62.00

65.90

69.70

73.30

76.90

80.50

84.10

87.50

90.80

93.90

97.30

100.40

103.80

106.90

110.30

113.40

116.60

120.00

123.40

126.80

130.30

133.70

137.10

140.60

143.80

147.20

150.70

154.10

157.60

161.10

164.60

168.30

171.80

Heating

Susceptibility

(raw)

99.1

99.7

100.5

101.2

101.5

102.2

103.5

104.3

105.4

106.3

106.7

107.8

108.4

109.2

110.1

110.7

111.6

112.5

113.4

113.6

114.4

114.6

115.3

116.2

116.5

117.7

117.9

118.8

119.6

120.5

121.1

122.0

122.5

123.8

124.7

125.9

127.4

128.5

128.7

129.8

131.3

132.4

133.4

Heating

Susceptibility

(corrected)

240.1815

240.7679

241.6057

242.3340

242.6631

243.3978

244.7301

245.5633

246.6940

247.6263

248.0570

249.1885

249.8192

250.6483

251.5774

252.2064

253.1355

254.0630

254.9897

255.2147

256.0421

256.2672

256.9947

257.9197

258.2472

259.4722

259.6981

260.6255

261.4530

262.3805

263.0088

263.9362

264.4637

265.7920

266.7178

267.9453

269.4736

270.6010

270.8293

271.9576

273.4858

274.6157

275.6440

Cooling

Time

5640

5655

5671

5686

5701

2681

2698

2715

2732

2749

2766

2784

2801

2818

2835

2852

2869

2886

2903

2921

2938

2955

2972

2989

3006

3023

3040

3058

3075

3092

3109

3126

3144

3160

3175

3191

3206

3222

3237

3253

3269

3284

3300

3315

3331

3346

3362

3377

Cooling

Temperature

(°C)

47.1

45.0

43.0

41.0

39.2

672.3

670.9

668.7

666.5

664.0

660.7

657.9

654.3

650.7

646.8

643.2

639.3

634.7

630.8

626.2

622.0

617.8

613.6

609.4

604.9

601.1

596.9

592.8

589.0

584.9

580.8

576.7

572.6

569.3

565.5

561.5

557.8

554.1

550.1

546.4

542.7

538.7

535.1

531.1

527.1

523.2

519.2

516.0

Heating

Susceptibility

(raw)

-24.8

-24.8

-24.9

-25.0

-24.9

-147.4

-149.8

-150.1

-149.1

-145.4

-151.2

-150.6

-150.2

-146.9

-149.9

-151.1

-148.1

-149.5

-148.4

-146.7

-143.7

-143.1

-146.7

-144.8

-143.3

-138.8

-140.4

-140.5

-137.2

-130.9

-123.9

-121.3

-122.9

-117.3

-115.7

-113.6

-109.6

-105.7

-98.6

-91.5

-85.1

-77.1

-69.4

-60.6

-52.4

-43.3

-35.3

-28.1

Cooling

Susceptibility

(corrected)

116.4666

116.3896

116.3135

116.2073

116.2828

-1.1125

-3.5239

-3.8416

-2.8594

0.8204

-5.0063

-4.4289

-4.0580

-0.7870

-3.8186

-5.0477

-2.0792

-3.5163

-2.4478

-0.7850

2.1811

2.7471

-0.8868

0.9793

2.4429

6.9122

5.2783

5.1452

8.4145

14.6814

21.6482

24.2151

22.5820

28.1553

29.7246

31.7923

35.7624

39.6325

46.7402

53.7603

60.1204

68.0881

75.8190

84.5167

92.6844

101.7829

109.7506

116.9747

33
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Locaiites, Red Willow

County, Nebraska

Sample

No.

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

Heating

Time

661

678

693

711

728

745

761

778

795

812

829

846

863

880

896

913

930

947

964

981

998

1014

1031

1048

1065

1082

1099

1115

1132

1149

1166

1183

1200

1217

1233

1250

1267

1284

1300

1317

1334

1351

1367

1384

1401

1417

1434

1451

1467

Heating

Temperature

(°C)

175.30

179.40

183.20

187.30

191.30

195.70

199.80

204.20

208.30

212.40

216.30

220.70

224.80

228.70

232.90

236.80

241.00

244.90

249.10

253.30

257.50

261.50

265.70

270.00

274.20

278.20

282.80

287.10

291.40

295.40

299.70

304.10

308.40

312.50

316.80

320.90

325.30

329.40

333.50

337.90

342.00

346.20

350.60

355.10

359.30

363.70

367.90

372.10

376.30

Heating

Susceptibility

(raw)

134.0

134.2

136.7

137.5

139.5

137.9

142.9

145.1

144.2

146.3

145.0

147.3

147.9

149.0

150.8

151.7'

152.9

153.9

156.1

156.1

155.0

158.1

157.5

160.0

160.0

160.5

158.9

159.2

162.0

161.5

162.7

158.9

160.4

160.5

161.5

159.7

159.9

158.2

157.6

159.3

157.8

152.1

156.2

151.3

151.9

151.0

152.3

147.4

148.4

Heating

Susceptibility

(corrected)

276.2723

276.5054

279.0361

279.8693

281.9016

280.3371

285.3702

287.6058

286.7389

288.8720

287.6035

289.9391

290.5722

291.7037

293.5377

294.4691

295.7031

296.7346

298.9685

299.0024

297.9364

301.0687

300.5026

303.0374

303.0713

303.6036

302.0408

302.3755

305.2103

304.7426

305.9773

302.2128

303.7476

303.8807

304.9155

303.1486

303.3841

301.7172

301.1504

302.8859

301.4190

295.7530

299.8885

295.0248

295.6588

294.7943

296.1283

291.2622

292.2961

Cooling

Time

3393

3409

3424

3440

3455

3471

3486

3502

3517

3533

3549

3564

3580

3595

3611

3626

3642

3657

3673

3688

3704

3719

3735

3750

3766

3781

3797

3812

3828

3843

3859

3874

3890

3905

3921

3936

3952

3967

3982

3998

4013

4029

4044

4060

4075

4090

4106

4121

4137

Cooling

Temperature

(°C)

511.7

508.1

504.2

500.3

496.4

492.6

489.0

485.5

481.9

478.1

474.3

470.4

466.6

462.8

459.0

454.9

451.1

447.7

443.6

439.8

436.1

432.4

428.6

424.9

421.2

417.2

413.2

409.5

405.5

401.5

397.9

394.2

390.5

386.6

383.0

379.0

375.4

371.8

367.9

364.0

360.4

356.9

353.3

349.7

346.2

342.6

339.1

335.3

331.7

Heating

Susceptibility

(raw)

-20.6

-15.2

-9.6

-5.4

-2.4

-1.3

1.0

2.1

2.9

4.2

4.5

5.3

5.6

6.6

6.9

6.7

6.4

6.4

5.8

5.4

5.1

5.4

4.0

4.2

4.0

2.9

2.7

2.2

1.0

1.3

0.6

0.0

-0.1

-1.0

-1.8

-1.5

-2.0

-3.1

-3.4

-3.5

-3.8

-4.2

-5.0

-5.1

-5.3

-5.3

-6.4

-7.0

-6.5

Cooling

Susceptibility

(corrected)

124.4000

129.8109

135.2864

139.4679

142.4514

143.5857

145.8246

146.8433

147.6563

148.8846

149.1629

149.9393

150.1826

151.1469

151.4172

151.2721

150.9424

150.8800

150.2618

149.7871

149.5272

149.7863

148.3416

148.5148

148.2999

147.1326

146.8672

146.3584

145.1380

145.4107

144.6263

144.0038

143.9091

143.0065

142.1862

142.4309

141.9029

140.8078

140.3973

140.2988

140.0167

139.5324

138.7133

138.5402

138.3860

138.3569

137.1866

136.5969

137.0228

34
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

Heating

Time

1484

1500

1517

1533

1550

1567

1584

1599

1614

1629

1644

1659

1675

1690

1705

1720

1735

1750

1765

1781

1796

1811

1827

1842

1857

1872

1888

1903

1918

1934

1949

1964

1980

1995

2010

2026

2041

2056

2072

2087

2102

2118

2133

2149

2164

2179

2195

2210

2226

Heating

Temperature

(°C)

380.60

384.80

388.70

393.00

396.90

401.50

405.80

409.80

413.80

418.10

421.80

425.80

429.60

433.60

438.00

441.70

445.80

449.90

453.60

457.80

461.90

465.70

469.80

473.60

477.50

481.30

485.20

489.00

492.90

497.10

501.00

504.90

509.10

513.00

517.00

520.90

524.80

528.80

532.80

536.40

540.10

544.10

547.70

551.40

555.10

559.10

562.80

566.20

570.30

Heating

Susceptibility

(raw)

146.4

144.4

145.5

141.7

141.1

137.4

135.8

135.7

133.7

130.5

128.6

126.0

122.9

120.5

117.0.

113.5

110.4

106.1

102.2

98.3

94.3

89.8

85.6

80.3

75.0

70.4

64.8

59.4

52.8

45.8

38.5

31.0

23.1

14.5

6.1

-3.2

-13.2

-22.7

-31.3

-38.9

-46.3

-53.6

-61.2

-66.7

-74.0

-79.6

-86.0

-91.2

-96.8

Heating

Susceptibility

(corrected)

290.3309

288.3648

289.4963

285.7310

285.1625

281.4997

279.9344

279.8668

277.8991

274.7338

272.8637

270.2960

267.2267

264.8590

261.3946

257.9245

254.8576

250.5907

246.7206

242.8645

238.8977

234.4584

230.2415

224.9622

219.6737

215.0944

209.6159

204.2066

197.6681

190.7020

183.3636

175.9651

168.0890

159.5005

151.0888

141.8293

131.8858

122.4681

113.8805

106.2695

98.9194

91.6517

84.0608

78.6007

71.3506

65.7929

59.4128

54.1903

48.6634

Cooling

Time

4152

4168

4183

4198

4214

4229

4244

4260

4275

4291

4306

4321

4337

4352

4367

4383

4398

4413

4429

4444

4459

4475

4490

4506

4521

4536

4551

4567

4582

4597

4613

4628

4643

4659

4674

4689

4704

4719

4735

4750

4765

4781

4796

4811

4826

4841

4856

4871

4886

Cooling

Temperature

(°C)

327.9

324.1

320.3

316.8

313.3

309.8

306.1

302.3

298.9

295.1

291.4

287.6

283.9

280.5

277.1

273.7

270.0

266.9

264.0

260.9

257.8

254.4

251.1

247.7

244.3

241.0

237.6

234.3

230.9

227.6

224.0

220.7

217.1

213.8

210.5

207.2

203.9

200.6

197.1

193.8

190.2

187.0

183.7

180.5

177.0

174.0

170.8

167.3

163.8

Heating

Susceptibility

(raw)

-7.4

-7.5

-7.9

-8.8

-8.5

-8.7

-9.2

-9.7

-10.0

-10.5

-10.7

-11.1

-11.1

-11.5

-11.7

-12.4

-12.5

-12.8

-12.6

-13.3

-13.3

-13.6

-13.7

-13.9

-14.2

-14.3

-14.5

-14.7

-14.9

-15.3

-15.5

-15.6

-15.5

-15.8

-16.1

-16.2

-16.6

-16.0

-16.6

-15.6

-16.6

-17.3

-17.5

-17.8

-18.0

-18.0

-18.1

-18.5

-18.1

Cooling

Susceptibility

(corrected)

136.0921

135.9844

135.5057

134.5695

134.8692

134.6329

134.1030

133.5623

133.2748

132.7101

132.5202

132.1295

132.0697

131.6522

131.3947

130.7172

130.4974

130.2423

130.3689

129.7138

129.6688

129.3113

129.1947

128.9172

128.6497

128.5331

128.2556

128.0589

127.8315

127.4248

127.2157

127.0591

127.1200

126.7933

126.4667

126.3800

125.8634

126.4867

125.8884

126.7918

125.8227

125.0968

124.8002

124.4743

124.3260

124.2618

124.1059

123.7377

124.0394

35
Table 2. Magnetic Susceptibility vs. Temperature for samples from the McCook Localites, Red Willow

County, Nebraska

Sample

No.

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

NE530-7

Heating

Time

2241

2256

2272

2289

2306

2323

2340

2357

2374

2391

2408

2425

2442

2459

2476

2493

2510

2527

2544

2561

2578

2595

2613

2630

2647

2664

Heating

Temperature

(°C)

574.00

577.40

581.50

585.60

590.40

594.90

599.00

603.50

608.00

612.90

617.40

622.00

626.60

631.10

636.10

640.70

645.30

649.60

653.90

658.20

661.80

665.40

668.70

670.90

672.30

672.70

Heating

Susceptibility

(raw)

-101.0

-105.7

-111.7

-123.0

-128.7

-134.8

-135.6

-138.4

-141.9

-136.4

-142.3

-145.8

-144.4

-143^9

-149.4

-148.9

-147.3

-147.8

-148.2

-151.6

-151.1

-148.8

-153.5

-150.9

-151.0

-149.0

Heating

Susceptibility

(corrected)

44.4933

39.8208

33.8539

22.5870

16.9258

10.8621

10.0953

7.3316

3.8680

9.4076

3.5439

8.1085

1.5183

2.0546

-3.4050

-2.8678

-1.2307

-1.6960

-2.0612

-5.4265

-4.8974

-2.5683

-7.2416

-4.6239

-4.7126

-2.7093

Cooling

Time

4901

4916

4932

4947

4962

4977

4992

5007

5022

5037

5052

5067

5082

5097

5112

5127

5142

5157

5172

5187

5203

5218

5233

5248

5263

5278

5293

5309

5324

5339

5354

5370

5385

5400

5415

5431

5446

5462

5477

5492

5508

5523

5538

Cooling

Temperature

(°C)

160.6

157.3

154.1

150.9

147.7

144.5

141.4

137.9

134.7

131.6

128.4

125.2

122.1

118.9

115.8

112.7

109.5

106.1

103.0

99.9

96.8

93.9

90.8

87.7

84.9

82.0

79.2

76.4

73.8

71.3

68.4

65.9

63.3

60.8

58.5

55.9

53.1

'50.4

47.8

45.3

43.0

41.0

39.0

Heating

Susceptibility

(raw)

-18.7

-18.9

-18.7

-18.8

-18.9

-19.1

-19.2

-19.1

-19.2

-19.2

-19.4

-19.6

-19.5

-19.3

-19.2

-19.4

-19.4

-19.5

-19.3

-19.5

-19.6

-19.8

-20.0

-20.2

-19.9

-19.7

-19.8

-19.7

-19.7

-20.0

-19.7

-20.0

-20.1

-20.0

-20.0

-20.1

-20.0

-20.0

-20.0

-20.1

-20.1

-20.2

-20.2

Cooling

Susceptibility

(corrected)

123.4836

123.2469

123.4410

123.2652

123.1293

122.8835

122.8284

122.9002

122.7143

122.6893

122.4734

122.2476

122.3225

122.5067

122.5916

122.3666

122.3507

122.2433

122.4182

122.1732

121.9981

121.8347

121.6096

121.3846

121.6420

121.8386

121.6659

121.7633

121.8023

121.4421

121.6887

121.3985

121.3075

121.3773

121.3087

121.2577

121.2851

121.2333

121.2123

121.1521

121.0635

121.0373

120.9612

36