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Contributed by Yale Peabody Museum of Natural History.
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Transcription
OGALLALA
25.6-25.8 Loess exposed in roadcut.
26.5-26.7 Loess exposed in roadcut on right. McAllaster Buttes
on horizon at 11:30.
37
27.1-27.3 Sharon Springs Shale Member of Pierre Shale, over-
lain by loess, exposed in roadcut. Excellent ex-
posure of the Sharon Springs in pasture north of
highway.
20
27.6 Crossing North Fork of Smoky Hill River.
WESKAN SHALE MEMBER
10
28.3-28.5 Stratified Pleistocene sand and gravel (Crete Forma-
tion) overlain by loess (Loveland Formation) in
roadcut. McAllaster Buttes at 1 o'clock.
0
Feet
29.9 Entering McAllaster, Kansas.
30.2 Dirt road on right. Turn right.
30.3 Junction, dirt road and abandoned U.S. Highway 40.
Turn right on old U.S. 40.
31.3 Gate leading into pasture on north side of McAllaster
Buttes. STOP 6.
PIERRE SHALE
35
Proceed eastward on old U.S. 40.
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34
33
32
31
26
19
16
10
9
8
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31.9 Crossroad. Turn right (south) on county road.
32.8 Junction county road and U.S. Highway 40. Cross U.S.
40 and proceed south on Logan County Highway 391.
Sharon Springs Shale Member
33.1 Pierre Shale exposed in low roadcut on right.
33.3-33.5 Loess exposed in roadbank on left. For next several
miles route crosses upland surface of High Plains.
6
36.5-36.7 Loess exposed in roadcut on left.
36.8 Loess exposed in roadbank on right.
5
38.0 Valley of Smoky Hill River marked by line of trees
ahead.
38.5 Margin of low alluvial terrace.
4
39.2 Crossing Smoky Hill River, which is an intermittent
stream in this area.
39.4 Upper part of Smoky Hill Chalk Member of Niobrara
Chalk exposed in roadcuts. Chalk is overlain by
sand, gravel and loess of alluvial terrace. Note
exposures of weathered Smoky Hill in bluffs on right
at 2:30.
39.5 Smoky Hill overlain by thin loess veneer exposed in
low roadcut.
3
39.9 Junction Logan County Highway 391 and Kansas Highway
25. Turn left (east) on K-25.
2
40.1 Pierre Shale exposed in small fault block and over-
lain by loess.
Figure 14.- Graphic column of rocks exposed at McAllaster Buttes
(Stop 6), SE sec. 13, T 12 S, R 37 W, Logan County,
Kansas. Section measured by James E. Gill, U. S.
Geological Survey.
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