Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
G 492-A
Bentonite 1" (same as that 48" above base G-492, field correlation)
silty gr. sh
with interc siltstone 48"
see G-492
As above with
leng. siltst + 24"
limby siltst at
anonal fringe; streaks
grpe bone; st bore
Bentonite 4-6" (5)
Gray shale 18" (6)
Dk. gr. sh. wi ib silty sh. + low. of silt.
30"
rusty
7H
rusty
34"
7B
rusty
26"
Dk. gr. cl. sh.
(8)
white compact, bentonite?
Black shale 10" (9)
18" covered by
slope
wash
Graneros
Dakota
Sandstone, plates
to shaley 33"
Silty gray to
sandy beds 26" G492 B H 1
Hard, ripple
m'd ss in
thin irreg. body
1" to 4" thick