Image from the Biodiversity Heritage Library.
Contributed by Smithsonian Institution Archives.
| www.biodiversitylibrary.org
Transcription
Sandstone
Irongray Calc. S.S.
Subcrystalline st.
Ophileta Beds.
Trilobite bed +
Conglomerate
Rhynchonellids
+ Striped Stratum
Sparry Limestone
Great Central States
Potsdam.
Up. Potsdam.
Low. Calc.
Calajeras.
Quebec
Chazy.
Trenton.
Huda Riv.