Field Notebook: Maryland, Washington, DC 1921
Page 52
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Transcription
Typical Ordovician fossils of this section, as stated by Cruse. Saw some large spirifera on the side of D. corn- crenatus but are D. crenatus. Below no.1 it is 180' below to the new coal outcrop where the beds dip about 100 while at the next out- crop they dip about 20 to 25 degrees. This exposes shor about 30 feet of massive gray to blue impure limestone with syngenic vertical joints). In the maculiforma zone the fossils are most common in the lower half. D. maculiforma fails in the upper third where E. crenatus is most abundant. D. crenatus gets through. Left Cherry Run for Washington on the 5:42 C. M. train.