Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
G-493 C - Taken about 100 yds west of 493 C
and pierced for bentonite layers.
several exposures. From top unit G-493B
to up.
a 18 Siltstone ledge, fragments
b - Covered area to first bentonite above
ledge. Interval is made up of
platy siltstone with intercal shale
increasing upward in quantity.
Thickness can be det. from following
Distance - 19'7" horiz