114°00’ 2

60000mE 2

8 2 50 000 FEET (EAST) 9

43°00’

R 21 E R 22 E R 23 E R 24 E R 25 E R 26 E R 27 E R 28 E R 29 E

T 5 S

T 6 S

T 7 S

T 5 S

550 45’ 100 600 30’ 150 15’ 3

0 3 650 1 700 250

250

450 000 FEET

(CENTRAL)

113°00’

43°00’

42°45’00”

3

2 3

3

475

474

476

200 750 000 FEET (CENTRAL)

400

400

T 6 S

450

450 000 FEET

(EAST)

475

474

T 7 S

42°45’00”

4760000mN

400

114°00’ 2

6 2

8 2 550 000 FEET (CENTRAL) 9 R 21 E R 22 E R 23 E R 24 E R 25 E R 26 E R 27 E R 28 E R 29 E 50 45’ 100 600 30’ 150 15’ 3

0 3 650 1 700 3 250 000 (EAST) 113°00’ 20000mE 3 200 3 750

1500

1500

1550

1550

1500

1500

1450

1450

1450

1450

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1400

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1550

Digital orthophotograph of the Craters of the Moon, Kings Bowl, and Wapi lava fields showing the 

location of the Craters of the Moon 30'×60' quadrangle and the north half of the Lake Walcott 30'×60' 

quadrangle. Yellow arrows indicate the locations of photographs of selected features: 1, Split Butte; 

2, Higgins Blowout; 3, Wapi Park; 4, Kings Bowl; 5, Pillar Butte; 6, Cottrells Blowout; 7, Bear Trap 

cave. This is figure 3 in the accompanying pamphlet.

114°00' 113°00'

43°30'

43°00'

Lake Walcott

Snake River

Snake

River

Big Southern Butte

Carey

Arco

CRATERS OF THE MOON

NATIONAL PRESERVE

North half of the Lake Walcott 30’x60’quadrangle

Craters of the Moon 30 x60’ quadrangle

CRATERS OF

THE MOON

NATIONAL

MONUMENT

WAPI

LAVA FIELD

CRATERS OF THE MOON

LAVA FIELD

Big Southern Butte

KINGS BOWL

LAVA FIELD

Carey

Arco

CRATERS OF THE MOON

NATIONAL PRESERVE

North half of the Lake Walcott 30’x60’quadrangle

Craters of the Moon 30’x60’ quadrangle

CRATERS OF

THE MOON

NATIONAL

MONUMENT

0 5 10 KILOMETERS

0 5 10 MILES

86

93

20

93

26

20

93

20

1

2

3

4

7 6

5

117° 116° 115° 114° 113° 112° 111°

45°

44°

43°

42°

0 50 100 KILOMETERS

0 50 100 MILES

OREGON

WESTERN

 SNAKE

 RIVER

 PLAIN

WAPI LAVA FIELD

MONTANA

CRATERS OF THE MOON

LAVA FIELD

EASTERN

SNAKE RIVER

PLAIN

STUDY AREA 

IDAHO

WYOMING

GREAT

RIFT

KINGS BOWL

LAVA FIELD

NEVADA UTAH

CRATERS OF THE MOON

NATIONAL MONUMENT

AND PRESERVE

MAP

LOCATION

IDAHO

Regional index map showing the location of the study area prominent features. 

Modified from Kuntz and others (2007). Yellow area is the Snake River Plain. This is 

figure 1 in the accompanying pamphlet.

Boise

Pocatello

Idaho

Falls

Twin Falls

Base from U.S. Department of Agriculture, National Agriculture Imagery Program (NAIP), accessed in 2015 Universal Transverse Mercator (UTM) zone 12. 

North American Datum 1983 (NAD 83). Craters of the Moon National Monument and Preserve boundaries from the National Park Service accessed on October 

25, 2017, at https://catalog.data.gov/dataset/administrative-boundaries-of-national-park-system-units-9-30-2017-national-geospatial-data.

Holocene

Late Pleistocene

Late middle Pleistocene

Early middle Pleistocene

Early Pleistocene

QUATERNARY

HOLOCENE AND PLEISTOCENE BASALTIC LAVA FLOWS AND RELATED NEAR-VENT

PYROCLASTIC AND ERUPTIVE-FISSURE DEPOSITS OF THE SNAKE RIVER GROUP

UNCONSOLIDATED

SURFICIAL DEPOSITS

CORRELATION OF MAP UNITS

Flow names Eruptive

period

Radiocarbon

ages (yr B.P.)

40Ar/39Ar and K-Ar ages

Kings Bowl

Wapi

Minidoka

Larkspur Park

Laidlaw Lake

Kimama

Shale Butte

Vent 4319

Grandview Crater

Broken Top

Sand Butte

West Wildhorse Butte

Wapi Park

Vent 4901

Kimama Butte

Black Ridge Crater

A

H

B

E

E

D

[R, in the lower left of the unit box, indicates measured reversed polarity. Yr B.P., years before present (before A.D. 1950); ka, thousand years;

n.d., not determined; *, precise location of sample is unknown. Arrows show inferred age range of units]

C

Qwfd8

2,130±130*

2,270±50

3,590±70

7,470±80

15,100±160

19±2 ka

n.d. 

38±12 ka

<50 ka

34±29 ka

<50 ka

87±9 ka

n.d.

87±11 ka

~120 ka

475±38

CLAASEN

VENT COMPLEX

FLAT TOP

VENT COMPLEX

INFERNO CHASM

VENT COMPLEX

68±8 ka

73±8 ka

290±50 ka

Vent 4659

Adelaide Butte

The Crater

Vent 4401

Vent 4429

Vent 4371

Vent 4559

Vent 4267

Knoll Vent

Sid Butte

n.d.

n.d.

n.d.

n.d.

n.d.

n.d.

n.d.

n.d.

778±8

B

n.d.

Split Butte

~210 Vent 5329

138±6 ka

289±5 ka

265±30 ka Mosby Butte

Higgins Blowout

Qsbc60

Qwfc12

Qsbb5

Qwfb3

Qsbb6

Qsbb8

Qwfb4 Qwfb5

Qwfa1

Qcfb5

Qwfc9

Qwfc10

Qwfc7 Qwfc8

Qwfd1

Qwfd2

Qwfd3

Qwfd4

Qwfd5

Qwfd6

Qwfe1

Qwfe2 Qwfe4

Qwfd7

Qwfd9

Qwfc11

Vent 4373

Vent 4373

Vent 4753 Vent 4754 Vent 4705

Vent 4644 Vent 4539 Vent 4811

Vent 4354 Vent 4384 Vent 5270

R

R

Qwfc5 Qwfc6

Qsbc53

Qwfc4

Qsbc59

Flat Top Vent 5026 Vent 4822

Vent 5083 Streifling

? ?

Qes Qp

Qsbb14

Qsbb25

Qsbb34 Qwfb18

Qsbb24 Qwfb13

Qwfb14

Qwfb15

Qwfb16

Qwfb17

Qwfc1 Qwfc2

Qwfc3

Qsbc52

Qwfb12

Vent 5094

Vent 4645 Vent 4757

East Inferno

Chasm

Inferno

Chasm

Horse Butte Cottrells

Blowout

Rattlesnake

Butte

Qsbc22

Qcfb4

Qcfe2

Qcfh1

Qwfb1

Qwfb10

Qwfb6 Qwfb7

Qwfb8 Qwfb9

Claasen Vent 4829 Vent 4801

Vent 4862 Vent 4835 Vent 4569

Winters

Blowout

Qwfb2

Qwfa2

Vent 4645

Qwfc13 Qwfc14

Qwfb19 Qwfb20

Qwfe3

690±50 Vent 4640

Qes

Qp

Qwfa2

Qwfa1

Qcfb4

Qcfb5

Qcfe2

Qcfh1

Qwfb2

Qwfb1

Qwfb3

Qsbb6

Qsbb5

Qsbb8

Qsbb25

Qwfb5

Qwfb6

Qwfb7

Qwfb8

Qwfb9

Qwfb10

Qsbb24

Qwfb12

Qwfb13

Qwfb14

Qwfb15

Qwfb16

Qwfb17

Qwfb18

Qwfb19

Qwfb4

Qsbb14

Qsbb34

Qwfc7

Qwfc8

Qwfc9

Qwfc10

Qwfc11

Qwfc1

Qwfc2

Qwfc12

Qsbc52

Qsbc53

Qwfc4

Qwfc6

Qwfb20

Qwfc13

Qwfc14

Qwfd1

Qwfd2

Qwfd3

Qwfd4

Qwfd5

Qwfd6

Qwfd7

Qwfd8

Qwfd9

Qwfe1

Qwfe2

Qwfe3

Qwfe4

R

R

Qwfc5

Qsbc59

Qwfc3

Qsbc60

Qsbc22

LIST OF MAP UNITS

[More detailed descriptions of these units are available in the accompanying pamphlet. R, in 

the lower left of the unit box, indicates reversed polarity. Due to the addition of a shaded 

relief base, colors in the Correlation of Map Units and the Description of Map Units may not 

exactly match unit colors on the map]

UNCONSOLIDATED SURFICIAL DEPOSITS

Eolian sand (Holocene to early middle Pleistocene)

Playa deposits (Holocene to early middle Pleistocene)

HOLOCENE AND PLEISTOCENE BASALTIC LAVA FLOWS

AND RELATED NEAR-VENT PYROCLASTIC AND ERUPTIVE-FISSURE

DEPOSITS OF THE SNAKE RIVER GROUP

Surface- and fountain-fed, proximal, medial, and distal basaltic pahoehoe 

lava flows of the Kings Bowl lava field (Holocene)

Proximal, medial, and distal, chiefly tube-fed, basaltic pahoehoe lava flows 

and near-vent deposits of the Wapi lava field (Holocene)

Distal pahoehoe basalt lava flows of the Minidoka lava field (Holocene)

Distal pahoehoe basalt lava flows of the Larkspur Park lava field (Holocene)

Distal pahoehoe and a’a basalt lava flows of the Laidlaw Lake lava field 

(Holocene)

Distal pahoehoe basalt lava flows of the Kimama lava field (late Pleistocene)

Near-vent pyroclastic deposits and proximal, medial, and distal pahoehoe and 

a’a basaltic lava flows of the Shale Butte lava field (late Pleistocene)

Near-vent, basaltic pahoehoe lava flows of the Vent 4319 lava field (late 

Pleistocene)

Pahoehoe basaltic lava flows of the Grandview Crater lava field (late 

Pleistocene)

Distal pahoehoe basaltic lava flows of the Broken Top lava field (late 

Pleistocene)

Distal pahoehoe basaltic lava flows of the Sand Butte lava field (late 

Pleistocene)

Basaltic pahoehoe lava flows and near-vent pyroclastic deposits of West 

Wildhorse Butte lava field (late Pleistocene)

CLAASEN VENT COMPLEX (LATE PLEISTOCENE)

Basaltic, near-vent, pyroclastic deposits and proximal and medial pahoehoe 

lava flows of Claasen lava field

Basaltic pahoehoe lava flows of the Winters Blowout lava field

Basaltic pahoehoe lava flows and near-vent pyroclastic deposits of the Vent 4829 

lava field

Basaltic near-vent pyroclastic deposits and medial and distal pahoehoe lava 

flows of the Vent 4801 lava field

Basaltic near-vent pyroclastic deposits and medial and distal pahoehoe lava 

flows of the Vent 4862 lava field

Basaltic near-vent pyroclastic deposits and medial and distal pahoehoe lava 

flows of the Vent 4835 lava field

Basaltic near-vent pyroclastic deposits and proximal pahoehoe lava flows of 

the Vent 4569 lava field

INFERNO CHASM VENT COMPLEX (LATE PLEISTOCENE)

Basaltic pahoehoe lava flows and minor near-vent pyroclastic deposits of the 

Vent 5094 lava field

Basaltic, pahoehoe lava flows and near-vent deposits of the Inferno Chasm 

lava field

Basaltic pahoehoe lava flows and near-vent pyroclastic deposits of the East 

Inferno Chasm lava field

Basaltic pahoehoe lava flows and near-vent pyroclastic deposits of the Horse 

Butte lava field

Near-vent pyroclastic deposits and proximal pahoehoe lava flows of the 

Cottrells Blowout lava field

The following five map units are not part of

the Inferno Chasm vent complex

Basaltic, near-vent and proximal, medial, and distal pahoehoe lava flows 

of the Wapi Park lava field (late Pleistocene)

Near-vent, basaltic pyroclastic deposits of the Vent 4901 lava field (late 

Pleistocene)

Basaltic near-vent pyroclastic deposits and pahoehoe lava flows of the 

Kimama Butte lava field (late Pleistocene)

Basaltic medial and distal pahoehoe lava flows of the Black Ridge Crater 

lava field (late Pleistocene)

Basaltic near-vent pyroclastic deposits and medial and distal pahoehoe 

lava flows of the Vent 5329 lava field (late Pleistocene)

ERUPTIVE PERIOD C

Near-vent pyroclastic deposits and distal pahoehoe lava flows of the Split 

Butte lava field (late middle Pleistocene)

Basaltic, distal pahoehoe flows (late middle Pleistocene)

Basaltic pahoehoe flows of the Vent 4645 lava field (late middle 

Pleistocene)

Distal pahoehoe flows of the Mosby Butte lava field (late middle 

Pleistocene)

Basaltic, near-vent pyroclastic deposits and proximal and medial pahoehoe 

lava flows of Higgins Blowout lava field (late middle Pleistocene)

FLAT TOP VENT COMPLEX (LATE MIDDLE PLEISTOCENE)

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

flows of the Flat Top lava field

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Vent 5026 lava field

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Vent 4822 lava field

Distal basaltic pahoehoe flows of the Vent 5083 lava field

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Streifling lava field 

The following five map units may be part of a vent complex, but this has not been 

verified by paleomagnetic studies. Supposition of vent complex status is supported by close 

proximity of vents and similar thickness of loess cover, suggesting close or similar ages for 

the five map units

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Vent 4753 lava field (late middle Pleistocene)

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Vent 4754 lava field (late middle Pleistocene)

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Vent 4705 lava field (late middle Pleistocene)

Basaltic, near-vent pyroclastic and proximal, medial, and distal pahoehoe 

lava flows of the Vent 4644 lava field (late middle Pleistocene)

Basaltic, near-vent pyroclastic deposits and proximal, medial, and distal 

pahoehoe lava flows of the Vent 4539 lava field (late middle Pleistocene)

ERUPTIVE PERIOD D

Basaltic near-vent pyroclastic deposits, proximal, medial and distal 

pahoehoe lava flows of the Adelaide Butte lava field (early middle 

Pleistocene)

Basaltic proximal, medial and distal pahoehoe lava flows of the Vent 4659 

lava field (early middle Pleistocene)

 Basaltic proximal, medial and distal pahoehoe lava flows of the Vent 

4640 lava field (early middle Pleistocene)

Basaltic near-vent pyroclastic deposits and proximal pahoehoe lava flows 

of The Crater lava field (early middle Pleistocene)

Basaltic near-vent pyroclastic deposits and proximal pahoehoe lava flows 

of the Vent 4401 lava field (early middle Pleistocene)

Near-vent pyroclastic deposits and proximal and medial pahoehoe lava 

flows of the Vent 4429 lava field (early middle Pleistocene)

Basaltic near-vent pyroclastic deposits and proximal pahoehoe lava flows 

of the vent 4371 lava field (early middle Pleistocene)

Basaltic, near-vent pyroclastic deposits and proximal pahoehoe lava flows 

of the Vent 4267 lava field (early middle Pleistocene)

Basaltic, near-vent pyroclastic and proximal and medial pahoehoe lava 

flows of the Knoll Vent lava field (early middle Pleistocene)

ERUPTIVE PERIOD E

Near-vent pyroclastic deposits and proximal, medial, and distal pahoehoe 

lava flows of the Sid Butte lava field (early Pleistocene)

Near-vent pyroclastic deposits and proximal pahoehoe lava flows of the 

Vent 4559 lava field (early Pleistocene)

Near-vent pyroclastic deposits and proximal pahoehoe lava flows of the 

Vent 4373 lava field (early Pleistocene)

Proximal pahoehoe lava flows of the Vent 4373 lava field (early 

Pleistocene)

None of the following map units have radiometric ages that would determine their 

absolute age. Some of the units have stratigraphic relations with dated lava fields; thus, their 

relative ages can be inferred. Where applicable, depth of loess and eolian sand has been used 

to determine relative age. Arrows in Correlation of Map Units show inferred age range of units

Basaltic near-vent deposits of the Rattlesnake Butte lava field (late 

Pleistocene)

Basaltic near-vent deposits and proximal pahoehoe lava flows of the Vent 

4645 lava field (late Pleistocene)

Near-vent pyroclastic deposits and pahoehoe lava flows of the Vent 4757 

lava field (late Pleistocene)

Basaltic, near-vent pyroclastic deposits of the Vent 4811 lava field (late 

middle Pleistocene)

Basaltic near-vent pyroclastic deposits of the Vent 4354 lava field (late 

middle and early middle Pleistocene)

Basaltic near-vent pyroclastic deposits of the Vent 4384 lava field (late 

middle and early middle Pleistocene)

Basaltic, near-vent pyroclastic and proximal, medial, and distal 

pahoehoe flows of the Vent 5270 lava field (late middle Pleistocene)

Photograph 3. Wapi Park. View to the southwest at 

aligned vents of the Wapi Park lava field (Qwfb15). 

Encroaching dark lava flows are of the Wapi lava field 

(Qwfa2). Distance from nearest vent to farthest vent is 

about 2 kilometers. Photograph by Susan Sakimoto 

(Space Science Institute and University at Buffalo) and 

Scott Hughes, pilot (Dept. of Geosciences Idaho State 

University). Photograph taken July 11, 2002.

Used with permission.

A

B

Photograph 7. Bear Trap cave. A, Entrance to Bear Trap cave (a skylight). 

Photograph by JF Hobbs, June 28, 2009. Accessed May 28, 2018, at

https://commons.wikimedia.org/wiki/File:Bear_Trap_Cave_-_panoramio.jpg. 

B, View looking out of Bear Trap cave. Entrance is approximately 5 meters high. 

Photograph by JF Hobbs, July 25, 2009. Accessed May 28, 2018, at

https://commons.wikimedia.org/wiki/File:In Bear_Trap_Cave_-_panoramio.jpg. 

Photograph 5. Pillar Butte and Wapi Park. Oblique view to the northeast of Pillar 

Butte, the vent area for the Wapi lava field (Qwfa2). The light-colored area to the 

north is the Wapi Park lava field (Qwfb15). Late-stage channel-fed a’a and slab 

pahoehoe cover the vent area. Pillar Butte is a mass of agglutinated spatter 

adjacent to one of the many pit craters that occur in the vent area. Photograph by 

Susan Sakimoto (Space Science Institute and University at Buffalo) and Scott 

Hughes, pilot (Dept. of Geosciences Idaho State University). Photograph taken July 

11, 2002. Used with permission.

Photograph 1. Split Butte. Split Butte (Qwfc1) is a maar volcano located near 

the northwest edge of the Holocene Wapi lava field (Qwfa2). The vent area is 

roughly circular, 600 meters in diameter, and consists of a tephra ring containing 

an inner lava pond. Photograph by Susan Sakimoto (Space Science Institute 

and University at Buffalo) and Scott Hughes, pilot (Dept. of Geosciences Idaho 

State University). Photograph taken July 15, 2004. Used with permission.

Photograph 4. Kings Bowl. View to the northeast. Kings Bowl (Qwfa1) is 

located in the Great Rift volcanic rift zone. It is an 85-meter (m)-long, 

30-m-wide, and 30-m-deep explosion pit. The Kings Bowl lava field area 

shows good examples of noneruptive fissures in older flows in Idaho (tan 

area). The slightly lighter area to the east of the fissure on the Kings Bowl 

lava field is fine-grained ejecta blown out of Kings Bowl. Note encrusted 

prominent basalt in mounds that surround the Kings Bowl. Photograph by 

Susan Sakimoto (Space Science Institute and University at Buffalo) and 

Scott Hughes, pilot (Dept. of Geosciences Idaho State University). Photograph 

taken July 11, 2002. Used with permission.

Photograph 6. Cottrells Blowout. View to the southwest of Cottrells 

Blowout (Qwfb14), a slot-shaped vent located just north of the Kings 

Bowl lava field (Qwfa1). It is one of the most spectacular vents in terms 

of length and depth in the eastern Snake River Plain. Photograph by 

Susan Sakimoto (Space Science Institute and University at Buffalo) and 

Scott Hughes, pilot (Dept. of Geosciences Idaho State University). 

Photograph taken July 11, 2002. Used with permission.

Photograph 2. Higgins Blowout. View looking northeast at the slot-shaped vent 

of the Higgins Blowout (Qwfc3). The vent is 600 meters (m) long, 200 m wide, and 

as deep as 50 m. The darker pahoehoe is from the Wapi lava field (Qwfa2). 

Photograph by Susan Sakimoto (Space Science Institute and University at Buffalo) 

and Scott Hughes, pilot (Dept. of Geosciences Idaho State University). Photograph 

taken July 15, 2004. Used with permission.

Eruptive

fissure

Pillar Butte

Noneruptive

fissures

N

Qwfb15

Qwfa2

Qwfa1

Qcfb4

Qes

Qcfb4

Qcfb5

Qsbc22

Qsbb25

Qsbb25

Qwfb15

Qwfb15

Qwfb15

Qwfc1

Qwfc2

Qwfc13

Qwfc13

Qwfc14

Qwfc3

Qwfc3

Qwfb15

Qwfb15

Qwfb15

Qsbb25

Qwfa2

Qwfa2

Qwfa1

Qwfa1

Qwfa2

Qwfb16

Qwfb3

Qwfb3

Qwfd2

Qwfb6

Qwfd3

Qwfb8

Qwfb5 Qwfb20

Qwfb7

Qwfb9

Qwfb10

Qwfc7

Qwfc8

Qwfc9

Qwfc10

Qwfc11

Qwfa2

Qwfb18

Qwfb19

Qwfb4

Qsbb25

Qsbb24

Qwfb12

Qwfb12

Qwfb12

Qsbb34

Qwfb13

Qwfb13

Qwfb14

Qsbc52

Qsbc53

Qsbc59

Qsbc60

Qwfc4 Qwfc5

Qwfc5

Qwfc6

Qp

Qp

Qp

Qp

Qsbb5

Qsbb6

Qwfb1

Qwfb1

Qwfb1

Qwfb2

Qwfd7

Qwfd8

Qwfb17

Qwfb17

Qwfe1

Qwfd1

Qwfd1

Qwfd1

Qwfd5

Qwfe2

Qwfd6

Qwfd4

Qwfe3

Qwfe4

Qwfc12

Qwfd9

Qsbb14

Qsbb8

Qsbb8

Qcfe2

Qcfh1

Chasm

Sid Butte

778±8

687B4

58.5, 323.9

EXPLANATION OF MAP SYMBOLS

Contact—Where dashed indicates separate individual lava flows within the same 

map unit where the identity or existence is certain and location approximate. 

Dashed contact indicates inferred limit of a’a flows for Shale Butte lava field, 

and slab pahoehoe for Wapi lava field. Dashed contact in Horse Butte lava 

field separates flows erupted from two adjacent lava-tube systems

Eruptive fissure—Fractures in rock through which lava has erupted. Width 1–2 m

Non-eruptive fissure—Fractures in rock through which lava has not erupted. 

Width generally <1 m

Narrow lava channel—Less than 5 m wide. Hachures point away from channel

Wide lava channel—Greater than 5 m wide. Hachures point away from channel

Lava flowline—Arrow indicates direction of flow

AREAL FEATURES

Crater—Hachures point into crater

Skylights—Black circles outline collapsed parts of lava tubes. Mapped to scale

Lava pond—Basalt-filled depression surrounded by levees that are shown by 

hachured line. Ticks point toward lava pond

POINT FEATURES

Small cone—Small lava cone, cinder cone, or spatter cone

Rootless vent—Secondary source of lava not directly related to conduit to deep 

magma reservoir

Sample sites—40Ar/39Ar sample sites with geographic location (if named) and 

preferred age in thousands of years (ka). See table 1

Paleomagnetic sample location—Showing site label, remanent direction of 

inclination and declination

Base from U.S. Geological Survey Lake Walcott, 1:100,00-scale, 1993

1927 North American Datum (NAD 27)

Projection and 10,000-meter grid: Universal Transverse Mercator, zone 12

50,000-foot ticks, Idaho coordinate system, central and east zones

Shaded relief base from 10-meter U.S. Geological Survey National Elevation

Dataset (NED), accessed 2018 at https://lta.cr.usgs.gov/NED

Craters of the Moon National Monument boundary accessed in Dec. 2017 at

https://catalog.data.gov/dataset/craters-of-the-moon-administrativemanagement-boundary4c667/resource/a2058d58-c72c-49b6-bb49-f441644e2c25 

CONTOUR INTERVAL 10 METERS

(BASEMAP CONTOUR INTERVAL 20 METERS)

NATIONAL GEODETIC VERTICAL DATUM OF 1929

TO CONVERT FROM FEET TO METERS MULTIPLY BY 0.3048

Geologic mapping by M.A. Kuntz and D.E. Champion, 2002, 2003, and 

2004. Additional mapping in the eastern part of the map area by

H.R. Covington, 1977

GIS database and digital cartography by D. Paco VanSistine

Edit and cartographic layout by L.J. Binder

Manuscript approved for publication April 18, 2018

QUADRANGLE LOCATION

IDAHO

APPROXIMATE MEAN

DECLINATION, 2017 TRUE NORTH

MAGNETIC NORTH

12°

For more information concerning this publication, contact:

Center Director, USGS Geosciences and Environmental Change Science Center

Box 25046, Mail Stop 980

Denver, CO 80225

(303) 236-5344

Or visit the Geosciences and Environmental Change Science Center website at

https://www.usgs.gov/centers/gecsc

To learn about the USGS and its information products visit

http://www.usgs.gov/ 

1-888-ASK-USGS

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Suggested citation: Kuntz, M.A., Champion, D.E., Turrin, B.R., Gans, P.B., Covington, H.R., and 

VanSistine, D.P., 2018, Geologic map of the north half of the Lake Walcott 30'×60' quadrangle, 

Idaho: U.S. Geological Survey Scientific Investigations Report 3405, pamphlet 25 p., scale 

1:100,000, https://doi.org/10.3133/sim3405.

Report digital files available at https://doi.org/10.3133/sim3405

ISSN 2329-132X (online)

https://doi.org/10.3133/sim3405

ScienceBase data release GIS files that support this report are available at

https://doi.org/10.5066/F7VQ30VZ

Any use of trade, firm, or product names is for descriptive purposes only and does not imply 

endorsement by the U.S. Government.

This map or plate is offered as an online-only, digital publication. Users should be aware that, 

because of differences in rendering processes and pixel resolution, some slight distortion of scale 

may occur when viewing it on a computer screen or when printing it on an electronic plotter, even 

Geologic Map of the North Half of the Lake Walcott 30'×60' Quadrangle, Idaho when it is viewed or printed at its intended publication scale.

By

Mel A. Kuntz,1

 Duane E. Champion,1 Brent R. Turrin,2 Phillip B. Gans,3 Harry R. Covington1, and D. Paco VanSistine1

2018

Prepared in cooperation with 

the National Park Service and the Bureau of Land Management

International System of Units to U.S. customary units 

CONVERSION FACTORS

Multiply By To obtain

0.03937 inches (in.)

3.281 foot (ft)

0.6214 mile (mi)

0.3861

0.2399

Length

Area

Volume

millimeter (mm)

meter (m)

kilometer (km)

square mile (mi2

)

cubic mile (mi3

)

square kilometer (km2

)

cubic kilometer (km3

)

1 U.S. Geological Survey

2

Department of Earth and Planetary Sciences, Rutgers University, Piscataway, N.J.

3

Department of Earth Science, University of California, Santa Barbara, Calif.

1 0 1 2 43 5 6 7 8 9 10 KILOMETERS

SCALE 1: 100 000

1 0 1 2 3 4 5 6 7 8 MILES

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 3405

Pamphlet accompanies map

Kimama Butte

Rattlesnake

Butte

The Crater

Adelaide

Butte

Bear Trap

Lava

Tube

Cottrels

Blowout

Kings Bowl

Flat

Top

Pillar

Butte

Winters

Blowout

Inferno

NATIONAL 

MONUMENT

BOUNDARY

MONUMENT

NATIONAL

BOUNDARY

AND PRESERVE

AND PRESERVE

MONUMENT

NATIONAL

BDY

AND PRESERVE

Divisions of Quaternary, Neogene, and Paleogene time

used in this report1

Period or

subperiod

Epoch Age

Quaternary

Holocene 0–11.7 ka

late 11.7–128 ka

Pleistocene late-middle 128–400 ka

early-middle 400 ka–780 Ma

1

Ages of time boundaries are those of the U.S. Geological Survey Geologic Names 

Committee (2010) except those for the Pleistocene are as defined by the authors for 

the purposes of this report. Ages are expressed in ka for kilo-annum (thousand years) 

and Ma for mega-annum (million years).

early 780–1.8 Ma

115°

43°

42°

43°30'

113°

42°30'

114° 112°

SNAKE

RIVER

Idaho Falls

Pocatello

Twin Falls

LAKE WALCOTT

TWIN FALLS

ROGERSON OAKLEY MALAD CITY

POCATELLO

FAIRFIELD CRATERS OF THE MOON BLACKFOOT

SIM 3405

(Kuntz and others, 2017)

SIM 2969

(Kuntz and others, 2007)

Index to U.S. Geological Survey (USGS) 30'× 60' quadrangles. Map area shown in 

yellow. For the USGS publications, the publication number, author(s), and year of 

publication are shown. 

Base modified from U.S. Geological Survey 1:100,000-scale maps

100 20 30 40

100 20 30 40

50 KILOMETERS

50 MILES

93

20

93

26

86

26

26

30

30

93

20

15

15

84

84

84

Bear Trap Cave

Lake

Walcott

American Falls Reservoir

Shale Butte

19±2 ka

581B3

47.5, 0.5

939B4

48.5, 1.8

931B4

54.8, 353.4

565B3

53.3, 349.7

557B3

56.7, 19.6

549B3

51.3, 348.6

1 533B3

48.2, 0.7

717B3

48.7, 0.6

733B3

47.1, 1.4

725B3

46.4, 1.6

653B3

62.1, 345.6

645B3

61.7, 335.4

621B3

73.6, 19.8

613B3

74.0, 37.1

629B3

75.7, 17.0

637B3

72.3, 22.2

669B3

77.2, 18.9

685B3

59.5, 26.9

4460B

59.2, 27.4

4300B

64.7, 30.5

4540B

69.4, 349.9

677B3

56.8, 32.8

WapI1⁄2

62.8, 12.5 

4380B

59.7, 34.2

693B3

77.8, 340.2

661B3

49.7, 1.7

662B4

75.9, 7.5

KBII

61.9, 13.2

701B3

72.7, 335.9

709B3

56.0, 350.4

WapI3⁄4

62.8, 13.9

741B3

44.2, 3.9

525B3

47.1, 3.2

509B3

54.2, 351.6

921B4

26.2, 334.9

517B3

55.1, 351.7

703B4

54.6, 354.2

711B4

28.1, 336.8

978B4

15.6, 2.1

541B3

57.5, 331.2

695B4

52.7, 354.4

687B4

58.5, 323.9 679B4

57.2, 328.0

749B3

62.6, 331.6

Sid Butte

778±8 ka

597B3

59.2, 352.4

573B3

-65.6, 167.8

765B3

40.0, 0.3

757B3

40.0, 0.3

979B4

51.6, 9.5

Adelaide Butte

475±38 ka

Kimama Butte

87±11 ka

Split Butte

138±6 ka

63.4, 347.2

226B7

234B7

39.3, 27.8

773B3

-51.3, 176.5

971B4

-57.6, 175.9

995B4

36.9, 25.6

605B3

62.4, 18.7

589B3

48.7, 2.2

Grandview Crater

38±12 ka

Wapi Park

87±9 ka

Claasen vent

complex

68±8

Higgins

Blowout

289±5

Vent 4640

690±50