Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
distance of Catretin schist. First across the Catretin
Mnt. and then the valley beyond. Finally we saw the
crest of the Blue Mts. made of Lower Cambria quartz-
itc. These ridges are probably 500 feet above
Frederick and Hagerstown.
The Lower Cambrian is nearly 4000 feet thick.