April 29-1913. Tuesday. Martinsburg Started out in the large limestone gorges to the east of town. The contact between the light blue (or rather white) Mass River and the Chambersburg limestone is very sharp. The former is heavy bedded enormously fracturing while the latter is dark blue and nodular. About 25 feet above here is a good zone for Cyclocrinus (globular and pyriform in shape), Streptelasma corniculum, and Echinolampas, Orthonoma and other Montien- lipridae. Also Orthus tricensaria and ? Christiania. Ive called Cryptogron in Balmantown near North Mountain Station. About 3/4 mile east of North Mt. jelly sand (sometimes clay) mud <1-1/2> mud oolite kinds light yellow mud, In this cut there are many Cryptogron to be seen and while at first draws distorted to beyond the phenomena as inorganic still I finally concluded that Cryptogron must be organic and perhaps algae. In places the material is not in hemispheric masses but in sheets that are plain or flat or hemmoroly (=???).