Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
First Ss Dakota (exposed) = 33' platey
at top to shaley. Underlain by
26" Silty sly with sandy lools.
Latter - Sample 492 B H'/1
Below this Hard ripple marked
ss in thin irregular beds 4" to 1" thick.