Directly overlying Middle Jurassic rocks, including Carmel Formation,

 Page Sandstone, Entrada Sandstone, Sundance Formation, Piper Formation, Twin Creek Limestone, Sawtooth Formation, and Rierdon Formation

Navajo

Sandstone

Kayenta

Formation

Wingate

Sandstone

GlenCanyonGroup(LowerJurassic)

Triassic rocks, including Chinle Formation and equivalent

Paleozoic rocks

Precambrian rocks

Temple Cap Sandstone

(Middle Jurassic)

Gypsum Spring Fm.

(Middle Jurassic)

Nugget Sandstone

(Lower Jurassic)

Figure 7. Schematic diagram illustrating relationship of underlying strata, which are source for clasts, to the J-2 unconformity. 

Triangles denote chert pebbles. Not to scale. Not oriented.

Figure 6. Small fossiliferous clast on J-2 unconformity, 

probably a piece of a bryozoan derived from Paleozoic rocks. Clast measures 6.8 mm in longest dimension; collected at Klondike basin, Colorado [C103].

Figure 5. Clasts on J-2 unconformity derived from Gypsum Spring Formation. Collection localities: 

A, Douglas, Wyoming [W47]; 

B and 

C, Beaver Creek, Wyoming [W42]; 

D, Red Dome, Montana [M6]; 

E, Red Creek, Wyoming [W22].

A

B

C

D

E

Figure 4. Grit and small pebbles associated with the J-2 unconformity. Collection localities: 

A, Four Mile 

Canyon, Colorado [C23]; 

B, Sage Creek Basin, Wyoming [W67]; 

C, Justensen Flats, Utah [U10]; 

D, Bell 

Springs, Wyoming [W62]; 

E, Redwater Creek, South Dakota [SD1]; 

F, State Bridge, Colorado [C28].

A

B

C

D

E

F

Figure 3. Unusual clasts on J-2 unconformity. 

A, chertified wood, probably derived from Triassic rocks; collected at Radium Trail [C81]; 

B and 

C, pink chert pebbles derived from Navajo Sandstone; collected at Brush Creek, Utah [U4]. 

D and 

E, pink chert pebbles derived from 

Nugget Sandstone; 

D is unweathered, 

E is weathered; collected at Ferris Mountain, west, Wyoming [W52].

A

B

C

D

E

Figure 2. Large clast on J-2 unconformity, about natural size, derived from cherty 

limestone bed in Navajo Sandstone. Collected at Ruby Canyon, Colorado [C37].

Figure 1. Clasts on J-2 unconformity derived from cherty limestone beds in Navajo Sandstone. Collection 

localities: 

A, Butler Wash, Utah [U99]; 

B, Spotted Wolf Canyon, Utah [U11]; 

C, Smith Cabin, Utah [U9]; 

D, Blue Creek, Colorado [C68].

A

B

C

D

16

37

27

28

25

26

29 54 57 58 59

66

67

55 56

68 65

31

30

23 22

17

19 20

21

38 40 41 39

43

42 44

45 46

47

49 52

51 50 53

54 56

55 57

58 59

62 63 64

67

69

68 70

71

72

74

75

80

82

81

83

99 98

73

65 66

99

61

60

48

75

74

79 80

85

86

81

76

83 82 84

87

88

90 91

89

93

96 97 94

98

103

24

UTAH

COLORADO

Green River

Desert

Moab

Salt anticline

region

Colorado

River

0 50 KILOMETERS 100

MAP B. CLAST LOCALITIES IN THE SALT ANTICLINE REGION OF COLORADO AND UTAH

[Letter prefixes denoting State name have been deleted from locality numbers for clarity]

GEOLOGIC INVESTIGATIONS SERIES

I–2622

HOWING DISTRIBUTION OF EROSIONAL CLASTS ON THE MIDDLE JURASSIC J-2 UNCONFORMITY IN THE WESTERN INTERIOR OF THE UNITED STATES

By

Robert B. O’Sullivan and George N. Pipiringos

1998

Manuscript approved for publication December 3, 1997

Editing and digital cartography by Alessandro J. DonatichAny use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Geological SurveyFor sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 80225This map is also available as a PDF at http://greenwood.cr.usgs.gov

Table 1. Clast data

[Symbols used: Location: un, unsurveyed. Maximum size of clast found: LFNF, pebbles or granules were looked for but not found; ONM, pebble was observed but not measured. 

Lithologic type: C, chert; Cl, clay; Ge, gneiss; Ls, limestone; ND, not described; S, sandstone or siltstone; Sc, schist; Q, quartz; Q3, quartzite. Source rock: G, Gypsum Spring Formation; K, Kayenta Formation; N, Navajo or Nugget Sandstone; 

g, Paleozoic rocks; pe, Precambrian; SU, source uncertain; 

d, Triassic rocks. Remarks: B-, pebbles or granules 

were noted, measured, or collected by person cited]

Locality Locality name Location Maximum size Lithologic Source Remarks

(Sec., T., R., or of clast found type rocklong W., lat N.) 

ARIZONA

A1 Cedar Mountain NE 1/4 SW 1/4 4, 41 N., 6 E. (un) 6 mm C N B-Fred Peterson.

A2 Ferry Swale NE 1/4 SW 1/4 21, 41 N., 8 E. 8 mm C N Do.

A3 Page SW 1/4 NW 1/4 19, 41 N., 9 E. (un) 5 mm C N Do.

A4 Garnet Ridge 109°45'13", 36°55'41" 16X10X9 mm C N

A5 Mexican Water 109°35'58", 36°59'20" 33X22X17 mm C N

A6 West Red Mesa NW 1/4 NE 1/4 SE 1/4 4, 41 N., 28 E. (un) 64X37X29 mm C N

A7 East Red Mesa NW 1/4 SE 1/4 NE 1/4 6, 41 N., 29 E. (un) 22X14X11 mm C N

A8 Leche-e Rock 111°16'37", 36°52'17" 4 mm C N

A9 Tsai Skizzi Rock 111°06'43", 36°49'20" 3 mm C N B-Fred Peterson.

A10 West Toh Acon Mesa 109°31'50", 36°47'38" 67X47X28 mm C N

A11 Antelope Pass 111°33'57", 36°40'16" 6 mm C N B-Fred Peterson.

A12 Klethla Valley 110°29'10", 36°34'02" 8 mm C N Do.

A13 Carson Mesa 109°45'36", 36°31'21" 39X15X5 mm C N

A14 East Toh Acon Mesa 109°22'30", 36°39'12" 50X28X15 mm C N

A15 Cove Mesa 109°17'15", 36°38'40" 22X18X10 mm C N

A16 Horse Mesa 109°03'07", 36°41'45" Grit to 2.2 mm Q, C SU

A17 Cove School 109°14'18", 36°32'22" 13X10X6.3 mm C N

A18 Many Farms 109°44'10", 36°23'40" 21X13X11 mm C N

A19 Lukachukai 109°10'27", 36°27' Grit Q, C SU

A20 Cow Springs 110°48'09", 36°24'49" 17X13X10 mm C N

A21 Middle Mesa 111°01'03", 36°14'13" Grit to 3 mm Q, C SU B-Fred Peterson.

A22 Lohali Point 109°44'48", 36°06'12" Grit Q, C SU

A23 Lupton, south NW 1/4 NE 1/4 9, 22 N., 31 E. Grit Q, C SU

COLORADO

C1 Sand Creek SW 1/4 NW 1/4 8, 11 N., 69 W. Grit Q, C SU

C2 Table Mountain NE 1/4 NE 1/4 13, 11 N., 70 W. Grit Q, C SU

C3 Boxelder, north C E 1/2 E 1/2 30, 11 N., 69 W. Grit Q, C SU

C4 Irish Lake SW 1/4 SW 1/4 SW 1/4 34, 11 N., 101 W. 18X17X12 mm C

g Other pebbles are a mixture derived 

 from G and 

g.

C5 Sheep Mountain SE 1/4 SE 1/4 NE 1/4 4, 9 N., 81 W. 6 mm C

g

C6 Boxelder, south SE 1/4 SW 1/4 NW 1/4 8, 10 N., 69 W. 45 mm S

d

C7 Owl Canyon SW 1/4 NE 1/4 NW 1/4 5, 9 N., 69 W. 15 mm C

g

C8 Ditch Creek SW 1/4 NW 1/4 NE 1/4 25, 8 N., 85 W. 6.6 mm C

g

C9 Bellvue SE 1/4 NW 1/4 NE 1/4 31, 8 N., 69 W. Grit Q, C SU

C10 Little Snake River S 1/2 SW 1/4 29, 7 N., 98 W. Grit Q, C SU

C11 Cameron Pass C E 1/2 W 1/2 NE 1/4 11, 6 N., 76 W. (un) Grit Q, C SU

C12 Loveland SE 1/4 SW 1/4 SW 1/4 8, 5 N., 69 W. Grit to 2 mm Q, C SU

C13 Dry Creek C W 1/2 NE 1/4 NW 1/4 24, 5 N., 70 W. 68X35X20 mm C

g

C14 Deerlodge Park NE 1/4 NE 1/4 NW 1/4 28, 6 N., 99 W. 17X9X6 mm C

g

C15 Calico Draw SE 1/4 SE 1/4 SW 1/4 4, 5 N., 99 W. 18X13X13 mm C G

C16 Miller Creek SE 1/4 SW 1/4 27, 4 N., 101 W. 17X14X12mm C

g

C17 Skull Creek SE 1/4 NE 1/4 36, 4 N., 101 W. 18 mm C N

C18 Frantz Creek SE 1/4 NW 1/4 SE 1/4 32, 4 N., 82 W. Grit Q, C SU

C19 Little Thompson C NE 1/4 NE 1/4 4, 3 N., 70 W. Grit Q, C SU

C20 Muddy Slide NE 1/4 14, 2 N., 84 W. 5 mm Q3 d or p

e

C21 Kremmling NE 1/4 NE 1/4 NW 1/4 21, 1 N., 81 W. 18 mm Sc, Q3 pe

C22 Tabernash SW 1/4 SE 1/4 NE 1/4 32, 1 N., 76 W. Grit ND SU

C23 Four Mile Canyon NW 1/4 NW 1/4 SW 1/4 12, 1 N., 71 W. Grit ND SU

C24 Elk Creek NE 1/4 NE 1/4 SW 1/4 33, 1 S., 84 W. 88X77X37 mm Sc p

e

C25 Radium, southwest SW 1/4 NW 1/4 27, 1 S., 82 W. 24 mm Sc p

e

C26 Radium, southeast SW 1/4 NE 1/4 26, 1 S., 82 W. 12 mm ND

d

C27 Burns NW 1/4 NW 1/4 NW 1/4 28, 2 S., 85 W. 32.2X25.4X15.3 mm Sc p

e

C28 State Bridge SW 1/4 24, 2 S., 83 W. 26X20X16 mm C

g

C29 Ralston Reservoir NE 1/4 NW 1/4 SW 1/4 5, 3 S., 70 W. Grit ND SU

C30 Wolcott NE 1/4 SW 1/4 SE 1/4 8, 4 S., 83 W. 10X8.3X4.6 mm Sc p

e

C31 Harris Reservoir SW 1/4 NE 1/4 NE 1/4 18, 4 S., 93 W. 6.1X4.6X3.2 mm C

g

C32 Middle Rifle Creek SW 1/4 SW 1/4 NE 1/4 36, 4 S., 93 W. 14.2X8.6X6.4 mm C

g

C33 Main Elk Creek NE 1/4 NE 1/4 NE 1/4 22, 5 S., 91 W. Grit to 1 mm Q, C SU

C34 Edwards NW 1/4 NW 1/4 SW 1/4 25, 4 S., 83 W. Grit to 3.4 mm Q, C

d, g

C35 Chacra SE 1/4 NE 1/4 SE 1/4 35, 5 S., 90 W. 9.2X6.4X6.3 mm C

g

C36 South Canyon Creek C W 1/2 SE 1/4 2, 6 S., 90 W. 6 mm C SU

C37 Ruby Canyon SE 1/4 lot 2, 5, 11 S., 104 W. 15.6X11.8X7.1 cm C N

C38 Loma NE 1/4 NE 1/4 SW 1/4 8, 1 N., 3 W. 45.3X29.9X20 mm Q3 g

C39 Black Ridge SE 1/4 SE 1/4 NW 1/4 20, 1 N., 3 W. 11.6X10X4.9 cm C N

C40 Fruita Reservoir NW 1/4 NW 1/4 NW 1/4 32, 1 N., 2 W. 73X62X44 mm C

g

C41 Redstone NE 1/4 SW 1/4 NW 1/4 20, 10 S., 88 W. 9.2X5.2X5.4 mm Q

g

C42 Capital Creek 107°04'37", 39°12'3" Grit to 3.2 mm Q. p

e B-B.H. Bryant.

C43 East Snowmass Creek SW 1/4, SE 1/4 SW 1/4 10, 10 S., 86 W. Grit to 1.8 mm Q, C

d

C44 Aspen 106°58'11", 39°09'23" Grit to 2 mm Q, C SU B-B.H. Bryant.

C45 Aspen, south N 1/2 S 1/2 NE 1/4 24, 10 S., 86 W. (un) Grit to 1.4 mm Q, C SU B-B.H. Bryant.

C46 Willow Creek 106°54'05", 39°10'18" Grit Q, C

d, g, p

e Do.

C47 Coke Ovens Trail NE 1/4 NW 1/4 NW 1/4 30, 11 S., 101 W. (un) 15X8X6 mm C N Pebbles from g also present.

C48 Rough Canyon NW 1/4 SW 1/4 30, 12 S., 100 W. (un) 69.3X40.7X38.2 mm C N

C49 Little Park Road NW 1/4 NW 1/4 NW 1/4 30, 12 S., 100 W. (un) 27.6X21.9X21.7 mm C N

C50 Cactus Park NE 1/4 SE 1/4 SE 1/4 36, 13 S., 100 W. 4.8X4.2X2.3mm C

g

C51 Bridgeport NW 1/4 NE 1/4 NE 1/4 18, 14 S., 98 W. Grit to 2 mm Q, C SU

C52 Little Dominguez SW 1/4 SW 1/4 NW 1/4 29, 14 S., 98 W. Grit to 1.6 mm Q, C SU

C53 Dominguez N 1/2 Lot 8, 30, 4 S., 3 E. Grit to 1.8 mm Q, C SU

C54 Lumsden Canyon NW 1/4 SE 1/4 25, 51 N., 20 W. (un) 13.7X11.3X8.5 mm C N

C55 John Brown Canyon SW 1/4 SW 1/4 32, 51 N., 19 W. (un) 28X16.7X15.3 mm C N

C56 Cave Canyon NW 1/4 SE 1/4 34, 51 N., 19 W. (un) 77.3X64X41 mm C N

C57 Tenderfoot Mesa B SE 1/4 NW 1/4 NE 1/4 36, 51 N., 19 W. 11.4X9.6X8.5 mm C N

C58 Tenderfoot Mesa A NE 1/4 SW 1/4 SE 1/4 31, 51 N., 18 W. 28.2X21.6X14.7 mm C N Small quartzite pebble from 

g also

 present. 

C59 Maverick Canyon B NE 1/4 SE 1/4 NE 1/4 32, 51 N., 18 W. 16X9X2 mm S K

C60 Escalante Forks SW 1/4 NE 1/4 NW 1/4 36, 51 N., 14 W. 3.6X3X1.4 mm C SU

C61 Escalante Creek #3 SE 1/4 SW 1/4 NW 1/4 21, 51 N., 13 W. Grit to 2.8 mm Q, C SU

C62 Escalante Creek #2 SE 1/4 SE 1/4 SW 1/4 36, 15 S., 98 W. Grit to 2 mm Q, C SU

C63 Duncan Trail 107°51'47" 38°39'40" 39.9X37.8X24.8 mm Q p

e

C64 Red Canyon 107°48'29", 38°40'08" 24.6X19.4X11.7 mm Q p

e

C65 Sinbad Valley NW 1/4 NW 1/4 31, 50 N., 19 W. 25.4 mm C N Cater (1970, p. 29).

C66 Flat Top Mesa SW 1/4 SW 1/4 17, 50 N., 18 W. 25.4X15.2X7.6 cm Ls N

C67 Calamity Mesa, southwest NW 1/4 SE 1/4 SE 1/4 32, 50 N., 18 W. 6.4X3.2X1.6 mm C N

C68 Blue Creek NW 1/4 SE 1/4 SE 1/4 3, 49 N., 18 W. 86.5X45.4X35.5 mm C N

C69 Escalante Forks A NE 1/4 SW 1/4 NE 1/4 14, 50 N., 14 W. Grit to 1 mm Q, C SU

C70 Dry Fork NW 1/4 SE 1/4 NE 1/4 20, 50 N., 13 W. Grit to 1.2 mm Q, C SU

C71 Monitor Creek 1 SW 1/4 NW 1/4 NW 1/4 30, 50 N., 12 W. Grit Q, C SU

C72 Roubideau Creek A SW 1/4 NE 1/4 SW 1/4 26, 50 N., 12 W. Grit, sparse Q, C SU

C73 Chukar Trail 107°50'32", 38°36'40" 42.1X15.5X5.3 mm Ge p

e

C74 Carpenter Ridge NW 1/4 SW1/4 NE 1/4 16, 48 N., 19 W. 11.9X10X6.8 mm C

g

 Truck Road.

C75 Beehive Canyon SE 1/4 NW 1/4 SW 1/4 11, 48 N., 18 W. 31X21.5X10 mm C N

C76 Atkinson Mesa SW 1/4 NE 1/4 NE 1/4 23, 48 N., 18 W. Grit to 4 mm Q, C SU

C77 Roubideau B NW 1/4 NW 1/4 NE 1/4 21, 49 N., 12 W. Grit to 1 mm Q, C SU

C78 Roubideau C SE 1/4 SE 1/4 SW 1/4 27, 49 N., 12 W. Grit Q, C SU

C79 West Paradox Creek SE 1/4 SW 1/4 NE 1/4 30, 48 N., 19 W. 20.3X12.7X10.2 cm Q3 g

C80 Sunrise Canyon NW 1/4 SE 1/4 NW 1/4 24, 48 N., 19 W. 6.4 mm C SU

C81 Radium Trail SW 1/4 SE 1/4 NE 1/4 29, 48 N., 18 W. 64.6X41X24 mm C

g Pebble is chertified wood; also pebbles 

 as much as 20 mm across of silicified  limestone derived from 

d.

C82 Martin Mesa SE 1/4 SE 1/4 NE 1/4 27, 48 N., 18 W. 9.1X8X7.7 mm C N

C83 Uravan Near C SE 1/4 SE 1/4 34, 48 N., 17 W. 31X22X20.7 mm Q3 g Also includes pebbles as wide as 21 mm 

 derived from N. There is a piece of  bryozoan in one pebble and a fusulinid  in another (D.A. Myers, oral commun.,  1987); both pebbles are from 

g.

C84 Tabeguache Creek 108°33'52", 38°21'39" Grit Q, C

g

C85 Lion Creek SE 1/4 SW 1/4 SW 1/4 12, 47 N., 20 W. 13 mm Q3 g Also abundant chert pebbles as wide as 

 6 mm from N.

C86 La Sal Creek SE 1/4 SW 1/4 NW 1/4 17, 47 N., 19 W. 15 mm C N B-Fred Peterson.

C87 Saucer Basin SW 1/4 SE 1/4 NE 1/4 1, 47 N., 18 W. 9.5X3.2X3.2 mm S K

C88 Long Park A NW 1/4 SW 1/4 NW 1/4 2, 46 N., 17 W. 20.3X10.2X3.8 cm S K Also milky quartz pebbles as wide as

 12.5 mm from 

g.

C89 Leach Creek SW 1/4 SW 1/4 SW 1/4 29, 46 N., 18 W. 44.5X43.4X20.7 mm C N

C90 Indian Henrys Cabin SW 1/4 NE 1/4 NW 1/4 2, 45 N., 18 W. (un) 54.7X40.9X24.7 mm C

g

C91 Sawtooth Ridge SE 1/4 SE 1/4 NW 1/4 18, 46 N., 16 W. Grit to 1 mm Q, C SU

C92 Horsefly Creek SE 1/4 SW 1/4 SW 1/4 13, 46 N., 13 W. Grit Q, C SU

C93 Peters Knob 108°51'38", 38°10'13" 9.5X6.4X4.8 mm C N

C94 Hamm Canyon NE 1/4 NW 1/4 NW 1/4 35, 45 N., 18 W. 11.5X10.6X9.3 mm C N

C95 Ouray SW 1/4 NE 1/4 NW 1/4 35, 45 N., 8 W. Grit to 4.4 mm Q

g, d

C96 McIntyre Canyon SW 1/4 NE 1/4 NW 1/4 17, 44 N., 19 W. 24X15.6X12.8 mm C N

C97 Cape Horn SE 1/4 NW 1/4 NW 1/4 8, 44 N., 18 W. 62.3X49.6X43.8 mm C N

C98 Poverty Flat SW 1/4 SE 1/4 NW 1/4 25, 44 N., 19 W. 46X41X30 mm C N

C99 Slick Rock NW 1/4 NW 1/4 NE 1/4 36, 44 N., 19 W. 75.8X61X51.2 mm C N

C100 San Miguel Canyon 108°10'41", 38°05'06" Grit to 0.6 mm Q SU

C101 Leopard Creek SW 1/4 NW 1/4 NW 1/4 24, 44 N., 11 W. Grit C, Q SU

C102 Beulah NW 1/4 SE 1/4 SE 1/4 2, 23 S., 68 W. 35X25X22 mm C

g

C103 Klondike Basin SE 1/4 SW 1/4 SE 1/4 9, 43 N., 16 W. 23X19.2X13.5 mm C

g Also includes chert pebbles from 

d and 

 a piece of a bryozoan from 

g.

C104 Specie Creek 108°07'08", 38°00'47" Grit to 1 mm Q SU

C105 Fall Creek NW 1/4 SW 1/4 NW 1/4 25, 43 N., 11 W. Grit to 1.4 mm Q, C SU

C106 Big Bear Creek NW 1/4 SW 1/4 SE 1/4 33, 43 N., 10 W. Grit to 1 mm Q, C SU

C107 Bilk Creek SE 1/4 NE 1/4 SE 1/4 26, 43 N., 10 W. Grit Q, C SU

C108 Telluride 107°48'03", 37°56'22" LFNF

C109 Barlow Creek south 107°59'37", 37°45'56" Grit to 1 mm Q, C SU

C110 Pass Creek SW 1/4 NE 1/4 NE 1/4 18, 27 S., 70 W. Grit Q, C SU

C111 Stoner NE 1/4 SW 1/4 SE 1/4 36, 39 N., 14 W. Grit to 1 mm Q, C SU

C112 McElmo Dome SE 1/4 31, 36 N., 17 W. 4.4X13.2X1 mm C N

C113 Durango NW 1/4 NW 1/4 NW 1/4 4, 35 N., 9 W. Grit Q, C SU

C114 Piedra River SE 1/4 SW 1/4 NW 1/4 5, 34 N., 4 W. Grit Q, C SU

C115 Weminuche 107°14'04", 37°23'49" 20.3 cm Q3 pe B-K.J. Franczyk.

C116 La Veta SW 1/4 SE 1/4 SW 1/4 26, 30 S., 69 W. Grit Q, C SU

MONTANA

M1 R. G. Parrent 1 McAlpine NW 1/4 SE 1/4 25, 37, N., 3 W. ONM C SU Described by Cobban (1945, p. 1302, 1303).

M2 Carter Oil Co. 25 Tribal SE 1/4 NW 1/4 27, 36 N., 6 W. ONM C SU Cobban (1945, p. 1301).

M3 Hannah-Porter Co. 1 Marceau SE 1/4 NW 1/4 3, 31 N., 6 W. ONM C SU Cobban (1945, p. 1300).

M4 Heath SW 1/4 SW 1/4 SW 1/4 1, 14 N., 19 E. 59X36X21 mm C

g

M5 Suction Creek Dome SW 1/4 SW 1/4 SW 1/4 12, 8 N., 20 E. 42X35X32 mm C

g

M6 Red Dome NE 1/4 NE 1/4 19, 7 S., 24 E. 60X32X12 mm C G

M7 Gardiner SW 1/4 19, 9 S., 9 E. ONM C SU Fraser and others (1969, p. 21).

M8 Gypsum Creek SE 1/4 33, 9 S., 27 E. 58X28X29 mm C G, 

g

M9 Lodge Grass Creek NW 1/4 SW 1/4 SW 1/4 8, 9 S., 33 E. 85X47X30 mm C G

NEW MEXICO

NM1 Ricardo Creek 105°09'30", 36°59'09" Grit Q, C SU B-C.L. Pillmore.

NM2 Valley SW 1/4 NE 1/4 SE 1/4 32 32 N., 33 E. 5 mm Ls

d B-W.I. Finch.

NM3 Battleship Mountain SE 1/4 NW 1/4 SE 1/4 28, 32 N., 35 E. 8 mm C

g Do.

NM4 Toadlena 108°53'34", 36°14'48" Grit Q, C SU

NM5 Mesa Alta NE 1/4 NW 1/4 NW 1/4 23, 23 N., 1 E. Grit to 4 mm Q, C SU B-W.W. Green.

NM6 Gallina SW 1/4 SW 1/4 NW 1/4 18, 23 N., 2 E. Grit to 0.6 mm Q, C SU B-J.L. Ridgley.

NM7 Ghost Ranch NW 1/4 NW 1/4 4, 24 N., 4 E. Grit Q, C SU

NM8 Gonzales Hill NE 1/4 2, 20 N., 30 E. Grit Q, C SU B-W.I. Finch.

NM9 Todilto Park 108°58'15", 35°57'15" LFNF

NM10 Navajo 109°01'45", 35°49'50" Grit Q, C SU

NM11 Cachana Spring NW 1/4 SW 1/4 SE 1/4 36, 17 N., 1 W. (un) 7 mm C

d B-M.W. Green.

NM12 San Ysidro NE 1/4 SW 1/4 NE 1/4 25, 16 N., 1 W. (un) Grit to 3 mm Q, C SU Do.

NM13 Mesa del Carro 105°02'27", 35°22'30" Grit to 2 mm Q, C SU Do.

NM14 Montoya SE 1/4 SE 1/4 NE 1/4 10, 17 N., 26 E. (un) 10 mm Cl

d B-W.I. Finch.

NM15 Wingate NE 1/4 NE 1/4 17, 15 N., 16 W. 5 mm Q, C SU

NM16 Thoreau NE 1/4 NE 1/4 19, 14 N., 12 W. 31X23X15 mm C

d

NM17 Cheechilgeetho SW 1/4 NE 1/4 SE 1/4 13, 12 N., 20 W. Grit Q, C SU

NM18 Nutria SW 1/4 NE 1/4 7, 12 N., 16 W. Grit Q, C SU

NM19 Acoma SW 1/4 NE 1/4 NW 1/4 2, 7 N., 7 W. 10.2 cm Q

d B-M.W. Green.

NM20 Petoch Butte NE 1/4 NW 1/4 32, 8 N., 6 W. 83 mm Q

d Stewart and others (1972, p. 213), and 

 Moench and Schlee (1967, p. 7).

NM21 Lasatar Ranch SW 1/4 SE 1/4 SW 1/4 32, 9 N., 26 E. 8.7X5.6X3.8 mm C

d B-J.L. Ridgley.

NM22 Luciano Mesa NE 1/4 NE 1/4 SW 1/4 8, 8N., 27 E. 5 mm Q, C

d B-M.W. Green.

OKLAHOMA

OK1 Carrizozo Creek NE 1/4 NW 1/4 SW 1/4 18, 5 N., 1 E. Grit to 3 mm C, Q SU B-W.I. Finch.OK2 Picket House Draw SW 1/4 NE 1/4 NW 1/4 36, 5 N., 5 E. Grit to 3 mm C, Q SU Do.

SOUTH DAKOTA

SD1 Redwater Creek NW 1/4 SW 1/4 NE 1/4 11, 7 N., 1 E. 5.6 mm C GSD2 Dewey SE 1/4 NW 1/4 NE 1/4 10, 6 S., 1 E. 50 mm C GSD3 Edgemont SE 1/4 NE 1/4 NE 1/4 7, 7 S., 3 E. 74X58X34 mm C G Pebbles derived from metamorphic rocks 

 also present.

SD4 Minnekahta Near C SE 1/4 NE 1/4 10, 7 S., 3 E. 25X16X9 mm C GSD5 Sheps Canyon NW 1/4 NE 1/4 15, 8 S., 5 E. 25 mm C G

UTAH

U1 Sheep Creek Gap NW 1/4 NW 1/4 NW 1/4 7, 2 N., 20 E. 53X20X19 mm C GU2 Hanna NE 1/4 SE 1/4 SE 1/4 4, 1 S., 8 W. ONM ND SUU3 Steinaker Draw NW 1/4 NW 1/4 26, 3 S., 21 E. 33X33X13 mm C NU4 Brush Creek SE 1/4 NW 1/4 NW 1/4 2, 3 S., 22 E. 55X42X26 mm C NU5 Red Wash SE 1/4 NE 1/4 SW 1/4 25, 4 S., 23 E. 6 mm ND SUU6 Cliff Ridge SW 1/4 NW 1/4 SW 1/4 3, 6 S., 24 E. 6 mm ND SUU7 Buckhorn Wash NW 1/4 SE 1/4 SW 1/4 18, 19 S., 11 E. 28X16X6 mm C NU8 Smith Cabin, north NW 1/4 NW 1/4 NE 1/4 36, 20 S., 13 E. 68.4X65X31.4 mm C NU9 Smith Cabin C N 1/2 N 1/2 5, 21 S., 14 E. 94X76X60 mm C NU10 Justensen Flats SE 1/4 NW 1/4 3, 23 S., 9 E. 23.5X18.3X9.8 mm C NU11 Spotted Wolf Canyon NE 1/4 SW 1/4 NE 1/4 12, 22 S., 13 E. 98.2X48.5X30.5 mm C NU12 Straight Wash E 1/2 SW 1/4 NE 1/4 28, 23 S., 13 E. ONM C NU13 Bull Bottom SE 1/4 NW 1/4 NW 1/4 12, 24 S., 16 E. 21.4X12.6X9.7 mm C NU14 North Temple Wash SE 1/4 SW 1/4 SE 1/4 1, 25 S., 11 E. (un) 9x6X6 mm C NU15 Temple Mountain SE 1/4 NE 1/4 SW 1/4 11, 25 S., 11 E. 63.5X50.8X12.7 mm C NU16 Westwater Canyon SW 1/4 SW 1/4 NE 1/4 16, 20 S., 25 E. 65.8X50X37.3 mm C NU17 Salt Valley NE 1/4 SW 1/4 NW 1/4 32, 22 S., 20 E. 11.9X6.8X4.5 cm C N Also includes a pebble, 91X61X21 mm, 

 containing bits of bryozoan from 

g

 (D.A. Myers, oral commun., 1987).

U18 Red Wash SE 1/4 SE 1/4 NW 1/4 3, 24 S., 17 E. 10.5X8.2X2.7 cm C NU19 Tenmile Butte NW 1/4 NW 1/4 SE 1/4 27, 24 S., 18 E. 14.9X7.5X6 cm C NU20 Jug Rock Flat SW 1/4 NW 1/4 NE 1/4 5, 25 S., 19 E. (un) 16.1X13.4X12.1 mm C NU21 Sevenmile Canyon NW 1/4 SW 1/4 12, 25 S., 19 E. (un) ONM C NU22 Mill Canyon NW 1/4 NE 1/4 NW 1/4 29, 24 S., 20 E. 13.1X10.5X4.7 cm C NU23 Arches National Park C SW 1/4 SE 1/4 24, 24 S., 21 E. 10 cm C NU24 Squaw Park NW 1/4 SE 1/4 NW 1/4 10, 23 S., 23 E. 12.4X6.5X4.3 cm C NU25 Dewey Bridge NW 1/4 SW 1/4 7, 23 S., 24 E. ONM C NU26 Dewey Bridge, south NE 1/4 SW 1/4 NW 1/4 17, 23 S., 24 E. 59X23X17.9 mm C NU27 Granite Creek SE 1/4 NE 1/4 SE 1/4 9, 23 S., 25 E. 10.4X6X4 mm C NU28 Cottonwood Canyon SE 1/4 SW 1/4 SE 1/4 23, 23 S., 24 E. 7.6X7.1X5.6 mm C

g

U29 Bridge Canyon NE 1/4 SE 1/4 SW 1/4 5, 24 S., 25 E. 12.7X9.4X7.5 mm C NU30 Polar Mesa 2 SW 1/4 SE 1/4 NE 1/4 11, 25 S., 25 E. (un) 51.8X35X22 mm C

g

U31 Polar Mesa 1 NW 1/4 SW 1/4 NW 1/4 12, 25 S., 25 E. (un) 17.7X13.9X15.2 mm C

g

U32 Black Ridge NW 1/4 SW 1/4 SE 1/4 17, 29 S., 4 E. Grit to 3 mm C SU B-Fred Peterson.U33 Fremont River C SW 1/4 NE 1/4 6, 29 S., 7 E. 8 mm ND SU Do.U34 Boulder NE 1/4 SW 1/4 SE 1/4 34, 33 S., 4 E. 6 mm ND SU Do.U35 The Post SW 1/4 SW 1/4 25, 34 S., 8 E. 50 mm C N Do.U36 Pine Creek NE 1/4 SW 1/4 SW 1/4 29, 34 S., 3 E. 10 mm C N Do.U37 Escalante SE 1/4 NW 1/4 SW 1/4 22, 35 S., 4 E. 20.5X12.6X6.4 mm C N Do.U38 Behind the Rocks 1 SE 1/4 NE 1/4 NE 1/4 17, 27 S., 22 E. 32X26X17 mm C NU39 Behind the Rocks 2 SE 1/4 NE 1/4 SW 1/4 21, 27 S., 22 E. 21X14X5.5 cm C NU40 Mill Creek NE 1/4 SE 1/4 SE 1/4 5, 27 S., 23 E. 14.9X14.6X10.1 mm C NU41 Spanish Valley, south NW 1/4 SW 1/4 SE 1/4 9, 27 S., 23 E. 69.1X58.7X32.6 mm C NU42 Behind the Rocks 5 SW 1/4 SE 1/4 SE 1/4 33, 27 S., 22 E. 64X34X51 mm C NU43 Behind the Rocks 6 SW 1/4 SE 1/4 NE 1/4 25, 27 S., 22 E. 19.5X11.3X6.2 cm C NU44 Behind the Rocks 4 SE 1/4 SE 1/4 NE 1/4 3, 28 S., 22 E. 56X35X30 mm C NU45 Kane Springs 1 NW 1/4 NW 1/4 NE 1/4 11, 28 S. 22 E. 42.1X24.3X23.5 mm C NU46 Kane Springs 2 NE 1/4 SW 1/4 SW 1/4 12, 28 S., 22 E. 81.5X42.9X30.6 mm C NU47 Flat Iron Mesa C SW 1/4 NW 1/4 25, 28 S., 22 E. 38.9X26.5X18.3 mm C NU48 La Sal Creek NE 1/4 SE 1/4 NE 1/4 32, 28 S., 26 E. 9.5 mm C N Includes clear quartzite pebbles from 

g.

U49 Hatch Point 1 SW 1/4 NW 1/4 SW 1/4 6, 29 S., 22 E. 50.8X38.1X12.7 mm C NU50 Hatch Point 2 NE 1/4 NE 1/4 SW 1/4 31, 29 S., 22 E. 25.4X15.8X9.5 mm C NU51 Hatch Rock SW 1/4 SE 1/4 SE 1/4 35, 29 S., 22 E. 83.9X41.3X28.7 mm C NU52 Wilson Arch SE 1/4 SE 1/4 SW 1/4 15, 29 S., 23 E. 20.1X17.2X12.5 mm C NU53 Hook and Ladder NW 1/4 SW 1/4 NE 1/4 25, 29 S., 23 E. 23.8X23X13.4 mm C NU54 Wind Whistle SE 1/4 NW 1/4 NW 1/4 13, 30 S., 22 E. (un) 56.7X54.4X29.7 mm C NU55 Wind Whistle Rock C NE 1/4 NE 1/4 23, 30 S., 22 E. (un). 58.3X49.5X35.2 mm C NU56 Rone Bailey C NW 1/4 SE 1/4 24, 30 S., 22 E. (un) 32.5X20.5X25.6 mm C NU57 Dry Valley 2 NE 1/4 NE 1/4 SE 1/4 36, 30 S., 22 E. 44X18.6X18.1 mm C NU58 Lopez Gulch SE 1/4 NW 1/4 NE 1/4 12, 30 S., 23 E. 46X41X21 mm C N Includes pebbles as wide as 41 mm from 

g. 

U59 Casa Colorado SW 1/4 NE 1/4 SE 1/4 17, 30 S., 24 E. 13.3X7.2X3.1 cm C NU60 Dry Valley, 3X SE 1/4 NE 1/4 NW 1/4 35, 30 S., 24 E. 16.8X21.4X12.3 mm C NU61 Big Indian Rock SE 1/4 SE 1/4 NW 1/4 36, 30 S., 24 E. 32.6X28X15.9 mm C NU62 Lone Cedar Draw NW 1/4 NW 1/4 NE 1/4 18, 31 S., 23 E. 11.9X9.8X9.1 mm C NU63 Photo Gap SW 1/4 NE 1/4 SE 1/4 29, 31 S., 23 E. 13.9X13.4X12.1 mm C NU64 East Canyon Wash C NE 1/4 SW 1/4 10, 31 S., 24 E. 68.4X40.4X49.2 mm C NU65 Three Step Hill, west NW 1/4 NW 1/4 SW 1/4 2, 31 S., 25 E. 46.9X43.4X24.1 mm C NU66 Three Step Hill, east SE 1/4 SE 1/4 SE 1/4 1, 31 S., 25 E. 58.3X32.3X20.6 mm C NU67 Harts Draw NW 1/4 NE 1/4 NW 1/4 35, 32 S., 22 E. 25.5X22.6X11.5 mm C NU68 Shay Mountain SE 1/4 SE 1/4 NE 1/4 14, 33 S., 21 E. (un) 84X49X53 mm C NU69 Indian Creek, west NW 1/4 SE 1/4 SE 1/4 7, 33 S., 22 E. (un) 14X11.7X7.8 mm C NU70 Indian Creek, east SE 1/4 SW 1/4 NE 1/4 9, 33 S., 22 E. (un) 41.1X21.7X18.3 mm C NU71 The Causeway NE 1/4 NE 1/4 16, 34 S., 21 E. (un) 53.5X31.8X23.7 mm C NU72 Dry Wash NE 1/4 NE 1/4 25, 34 S., 21 E. (un) 29.2X27.1X22 mm C NU73 Montezuma Canyon NE 1/4 NE 1/4 NW 1/4 14, 35 S., 24 E. 45X43X26 mm C N B-M.W. Green.U74 Mancos Jim Butte NE 1/4 NW 1/4 SE 1/4 21, 35 S., 21 E. 44.8X30.5X23.1 mm C NU75 Allen Canyon NW 1/4 NE 1/4 SE 1/4 29, 35 S., 21 E. 20.3 cm C NU76 Cedar City SE 1/4 SW 1/4 SE 1/4 12, 36 S., 11 W. Grit to 2 mm ND SU B-Fred Peterson.U77 Seep Flat SW 1/4 NE 1/4 6, 37 S., 5 E. (un) 23X14X12 mm C N B-H.D. Zeller.U78 Harris Wash SW 1/4 SE 1/4 SW 1/4 33, 36 S., 5 E. 8 mm ND SU B-Fred Peterson.U79 Egypt 15, 37 S., 6 E. (un) 6 mm ND SU B-Fred Peterson.U80 Indian Village SE 1/4 Lot 2, 6, 36 S., 21 E. 35.9X30.5X12 mm C NU81 Hammond Canyon SE 1/4 SW 1/4 NW 1/4 7, 36 S., 21 E. 27.7X13.6X10 mm C NU82 Cottonwood Wash SE 1/4 SE 1/4 NW 1/4 7, 36 S., 21 E. 35.4X31.9X15.1 mm C NU83 Blanding SW 1/4 NW 1/4 NW 1/4 7, 37 S., 21 E. 16X6X5 mm C NU84 Gunlock SW 1/4 SW 1/4 NE 1/4 32, 40 S., 17 W. Grit to 3 mm ND SUU85 Leeds NE 1/4 SW 1/4 NE 1/4 34, 40 S., 14 W. Grit to 3 mm ND SU B-Fred Peterson.U86 Pocket Mesa NW 1/4 NE 1/4 NE 1/4 34, 39 S., 11 W. Grit to 2 mm ND SU Do.U87 Potato Hollow NE 1/4 NE 1/4 NW 1/4 20, 40 S., 10 W. 5 mm ND SU Do.U88 Zican Lodge SW 1/4 SE 1/4 SW 1/4 16, 41 S., 9 W. Grit to 3 mm ND SU Do.U89 Mount Carmel Junction SW 1/4 SW 1/4 SE 1/4 25, 41 S., 8 W. Grit to 3 mm ND SU Do.U90 Brown Canyon NE 1/4 SE 1/4 NW 1/4 19, 41 S., 5 W. Grit to 3 mm ND SU Do.U91 Willis Creek 24, 38 S., 3 W. 6 mm ND SU Do.U92 Bull Valley Gorge SW 1/4 SW 1/4 NW 1/4 27, 38 S., 3 W. 5 mm ND SU Do.U93 Rush Beds NW 1/4 SW 1/4 SW 1/4 10, 39 S., 1 W. (un) Grit to 3 mm ND SU Do.U94 Cat Pasture C NW 1/4 NW 1/4 26, 38 S., 6 E. 6 mm ND SU Do.U95 Early Weed Bench 6, 38 S., 7 E. (un) 6 mm ND SU Do.U96 Hurricane Wash 26, 39 S., 7 E. Grit to 4 mm ND SU Do.U97 Cave Point SE 1/4 NE 1/4 SW 1/4 26, 40 S., 8 E. 25 mm ND SU Do.U98 Butler Wash 1 NE 1/4 SW 1/4 NE 1/4 18, 37 S., 21 E. 96.9X59.6X55 mm C NU99 Butler Wash 2 NE 1/4 SW 1/4 NW 1/4 20, 37 S., 21 E. 10.3X6.9X4.7 cm C NU100 Butler Wash 3 SW 1/4 NE 1/4 SW 1/4 5, 38 S., 21 E. 51.9X37.2X35 mm C NU101 Butler Wash 4 NW 1/4 NW 1/4 SW 1/4 17, 38 S., 21 E. 43.4X27.5X23.9 mm C NU102 Butler Wash 5 NW 1/4 SW 1/4 SW 1/4 5, 39 S., 21 E. 67.9X51.2X40 mm C NU103 Butler Wash 6 NW 1/4 NE 1/4 NE 1/4 31, 40 S., 21 E. 40x20.3X14.6 mm C NU104 Rock Creek 111°09'07", 37°09'40" 20 mm ND SU

U105 Sixtymile Point SE 1/4 NE 1/4 SW 1/4 6, 42 S., 9 E. Grit to 4 mm ND SUU106 Paria River SE 1/4 NW 1/4 15, 43 S., 1 W. 10 mm C N B-Fred Peterson.U107 Jacobs Tanks C SW 1/4 15, 43 S., 2 E. 5 mm ND SU Do.U108 Gunsight Canyon SE 1/4 SE 1/4 SE 1/4 34, 43 S., 5 E. 6 mm ND SU Do.

WYOMING

W1 Clarks Fork Canyon C W 1/2 NW 1/4 5, 56 N., 103 W. 13X8X5 mm Ls GW2 Sykes Mountain SE 1/4 SE 1/4 SW 1/4 7, 57 N., 94 W. 54X35X17 mm C G Also pebbles from 

g.

W3 Beaver Creek SW 1/4 1, 55 N., 64 W. 45.6 cm C, Ls G Mapel and Bergendahl (1956, p. 88).W4 Hulett SW 1/4 NW 1/4 SW 1/4 2, 54 N., 64 W. 12 mm C GW5 Sundance Mountain NE 1/4 25, 51 N., 63 W. 50 mm C GW6 Crystal Creek NE 1/4 NW 1/4 NE 1/4 18, 54 N., 93 W. 80X53X35 mm C GW7 Cody NE 1/4 3, 52 N., 102 W. 35X26X17 mm C GW8 Shell C E 1/2 3, 51 N., 91 W. 64X44X18 mm C GW9 North Fork Sayles Creek SE 1/4 SW 1/4 SE 1/4 6, 51 N., 83 W. 63X43X14 mm C GW10 Elgin Creek SW 1/4 NE 1/4 NW 1/4 14, 49 N., 83 W. 77X43X26 mm C GW11 Dry Muddy Creek NE 1/4 SW 1/4 2, 48 N., 83 W. 10.5X8.3X3.4 cm C GW12 Tensleep NE 1/4 10, 47 N., 89 W. 88X46X37 mm C GW13 Ramsbottom Ranch SW 1/4 NE 1/4 SW 1/4 23, 46 N., 83 W. 5 mm C GW14 Otter Creek SW 1/4 9, 45 N., 87 W. 57X38X16 mm C GW15 Mayoworth SW 1/4 SW 1/4 NW 1/4 3, 44 N., 83 W. 46X34X33 mm C G Also includes pebbles from 

g.

W16 South Fork Owl Creek C N 1/2 NW 1/4 1, 8 N., 1 E. LFNFW17 Thermopolis SE 1/4 NW 1/4 SW 1/4 19, 43 N., 94 W. 50X25X5 mm C GW18 Thermopolis, northwest SW 1/4 NE 1/4 NW 1/4 24, 43 N., 95 W. Grit C, Q SUW19 Wild Horse Butte SE 1/4 NW 1/4 NW 1/4 34, 43 N., 93 W. 53X47X17 mm C GW20 Redbank School E 1/2 18, 43 N., 87 W. ONM C GW21 Minecke Draw NW 1/4 NW 1/4 36, 43 N., 84 W. 43X35X13 mm C GW22 Red Creek SE 1/4 SE 1/4 SE 1/4 6, 6 N., 3 W. 33X27X15 mm C GW23 Nowood NE 1/4 2, 41 N., 89 W. 51X31X19 mm C GW24 Deadman Butte SE 1/4 NW 1/4 NE 1/4 24, 38 N., 87 W. 18X15X6 mm C GW25 Bull Lake SW 1/4 NE 1/4 SE 1/4 36, 3 N., 4 W. ONM ND SUW26 North Fork Sage Creek SE 1/4 SW 1/4 NE 1/4 17, 2 N., 3 W. 18X16X9 mm Q3 G

W27 South Fork Sage Creek SE 1/4 SE 1/4 NE 1/4 3, 1 N., 3 W. 30X26X7 mm C GW28 Peevah Creek SW 1/4 NW 1/4 SW 1/4 13, 1 N., 3 W. 17X18X13 mm C GW29 Juniper Butte C S 1/2 S 1/2 SE 1/4 17, 1 N., 1 W. 38X20X12 mm C GW30 Sage Creek anticline, north NE 1/4 NE 1/4 SE 1/4 16, 1 N., 1 W. 96X82X18 mm C GW31 South Fork Little Wind River SE 14/ SE 1/4 NE 1/4 4, 1 S., 2 W. 55X47X32 mm C GW32 Sage Creek anticline, south C N 1/2 NW 1/4 NE 1/4 7, 1 S., 1 E. 80X35X33 mm C GW33 Mill Creek SE 1/4 SE 1/4 NW 1/4 5, 2 S., 1 W. 33X21X16 mm C GW34 Baldwin Creek SE 1/4 SE 1/4 SE 1/4 8, 33 N., 100 W. 38X24X20 mm C GW35 Lander SE 1/4 SW 1/4 NE 1/4 13, 2 S., 1 E. 37X26X15 mm C GW36 Connant Creek SW 1/4 SW 1/4 NE 1/4 26, 33 N., 94 W. 25X21X15 mm C. GW37 Gas Hills SW 1/4 NW 1/4 NW 1/4 14, 33 N., 90 W. 5 mm Q, C SUW38 J E Ranch NE 1/4 SE 1/4 SE 1/4 30, 34 N., 88 W. Grit Q, C SUW39 Dallas anticline NW 1/4 NE 1/4 SW 1/4 12, 32 N., 99 W. 19 mm C GW40 Derby dome SW 1/4 NE 1/4 NW 1/4 33, 32 N., 98 W. 76 mm C GW41 Sheep Mountain NE 1/4 NE 1/4 NW 1/4 29, 31 N., 97 W. 15X10X9 mm C GW42 Beaver Creek (Halley) NE 1/4 NE 1/4 NE 1/4 2, 30 N., 97 W. 56X39X15 mm C GW43 Bessemer Mountain NE 1/4 SE 1/4 SE 1/4 16, 32 N., 81 W. 25.4 mm C GW44 Alcova, northwest NE 1/4 NW 1/4 SW 1/4 10, 30 N., 83 W. 18X17X5 mm C GW45 Alcova, southeast SE 1/4 SW 1/4 NW 1/4 29, 30 N., 82 W. Grit to 4 mm Q, C GW46 Garrett Ranch C N 1/2 NE 1/4 NW 1/4 12, 30 N., 80 W. ONM ND SUW47 Douglas C N 1/2 7, 31 N., 71 W. 53X36X9 mm C GW48 Sage Hen anticline NW 1/4 SE 1/4 SE 1/4 20, 31 N., 72 W. Grit Cl

d

W49 Sheep Creek anticline SE 1/4 SE1/4 NE 1/4 15, 28 N., 92 W. Grit ND SUW50 Green Mountain NE 1/4 SE 1/4 SW 1/4 18, 28 N., 91 W. Grit ND GW51 Horseshoe Creek SE 1/4 SE 1/4 SE 1/4 33, 29 N., 69 W. 6 mm ND SUW52 Ferris Mountain, west C E 1/2 NW 1/4 SW 1/4 18, 27 N., 88 W. 16X11X6 mm C SU Includes pink pebbles from N.W53 Ferris Mountain, east N 1/2 SW 1/4 9, 26 N., 87 W. 28X18X5 mm C GW54 Freezeout Hills, northeast C N 1/2 S 1/2 SW 1/4 33, 26 N., 79 W. Grit C SUW55 Sheep Creek NW 1/4 SW 1/4 NE 1/4 35, 26 N., 76 W. LFNFW56 Hurt Creek NE 1/4 NW 1/4 NW 1/4 24, 25 N., 85 W. Grit C SUW57 Sips Creek NE 1/4 NE 1/4 NW 1/4 24, 25 N., 84 W. ONM ND SUW58 Troublesome Creek W 1/2 NE 1/4 29, 25 N., 81 W. Grit C SUW59 Mud Spring N 1/2 N 1/2 SE 1/4 34, 25 N., 81 W. Grit C SUW60 Freezeout Hills, east NE 1/4 NE 1/4 SE 1/4 30, 25 N., 78 W. ONM C SUW61 Freezeout Hills, southwest SE 1/4 NE 1/4 NE 1/4 26, 24 N., 80 W. ONM C SUW62 Bell Springs C W 1/2 NW 1/4 SE 1/4 9, 23 N., 88 W. Grit to 4 mm C GW63 Rawlins, northeast NW 1/4 NE 1/4 NE 1/4 36, 22 N., 87 W. ONM C SUW64 Rattlesnake Creek SW 1/4 SE 1/4 26, 20 N., 82 W. LFNFW65 Farthing NW 1/4 NE 1/4 SW 1/4 3, 18 N., 70 W. ONM ND SUW66 Littlefield Creek C W 1/2 NE 1/4 NW 1/4 11, 17 N., 89 W. (un) ONM ND SUW67 Sage Creek Basin SW 1/4 NE 1/4 NE 1/4 27, 17 N., 88 W. Grit Q, C SUW68 Horse Creek SW 1/4 NE 1/4 SE 1/4 34, 17 N., 70 W. 12 mm C SUW69 Mesa Mountain SW 1/4 NE 1/4 SW 1/4 35, 16 N., 70 W. 7X4X3.5 mm C GW70 Big Sandstone Creek E 1/2 SE 1/4 NE 1/4 19, 14 N., 87 W. Grit C SUW71 Roaring Fork SW 1/4 SE 1/4 NE 1/4 8, 12 N., 86 W. Grit ND SUW72 Red Mountain NE 1/4 SW 1/4 NW 1/4 16, 12 N., 76 W. 10 mm C GW73 Red Mountain, south NE 1/4 SE 1/4 NE 1/4 21, 12 N., 76 W. Grit ND SU

ent 

se 

m 

ross 

e 

ber 

n 

 

d is 

ine. 

nt 

sic 

hich 

 

east 

een 

le 

ian 

und 

s, 

 

 and 

ved 

on 

alt 

). 

g 

ic 

g 

J-2 

that 

g 

e 

g) is 

ssic 

ado, 

: 

 

p.

 of 

ion 

o 

onal 

 

y: 

p. 

the 

u 

 

gy 

al