Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
silty
2.5 var. clays: red, gray & greenish:
silty clay: 2 1/2 -> 3' thick (argill
siltstone and sandy siltstone
2.3 <- gently fracturing; weathers light gray)
underlain by more ves. clay.
stup here Break in section: Dak-Granerus transition
beds:
6'+ from top of massive first ss of Dakota.
obscured by slopewash lower 8'
15.0 argill so interlidd with shale ->
thin beds platy sandstone fine grained
gray, weathering to light gray FC-
staining on joint places and some
bedding surfaces. Beds up to .5' thick
average about .2' thick. Centruncated
partings of sandy shale and calcary
sandstone.
upper 7' similar to lower 8'
but increasingly shaly upward
with sandstones becoming finely lam-
nated and grading upwards into
siltstones. Resistable argill. siltstone
bed .5' thick cape interval.
5.71 dark gray clayey shale, weathers a
light gray with rust staining on
surface. No fossils observed.
0.3' Bentonit
[0.8 hard gray, light gray weatherin
argill siltston.