Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
locally along strike shale
becomes fairly common and
siltstone beds thin 0.2 - 1.0.
In general most shale in middle
with SS at top & bzs@ locally.
SS, is fine to med. grv, commonly
has clay pellet cgh. Some
course-gr beds locally; A
distinctive unit. Bedding
surfaces show various features,
some current ripples &
worm casts. Shale zones
have silt-filled