[D.B.B. - Devils Back Bone] Thursday June 2-1910 Left Martinsburg at 6.30 A.M. for Great Cacapon. Crossed over the Potomac to the Maryland side. The first in the study involved up on Crisling with many Spirifera arenaria. The base of the Crisling here seems to be derive of the black chert nature as at Cumberland but in a finer sandstone than at the M.C. The fossils also are scarce. Thickness estimated at 35-4 feet at 12 depth. Then follows helps a whitish mottled oilgreen shale and brown decidus chert bands with Spirifer incrustulens, Lap chebrideli, Estoma medali, more Lap Kobelti? Strigoderma welleri etc. Thickness less than 30 feet and probably means 25 feet. Together about 27 feet. Then comes in at once the heavy bedded Coeyman as at the D.B.B., going into them bedded zones with orthid deformin common near the M.C. and T. syngeantia, which lie goes down to first modular zone which is 50 feet here with top. Meristella (large), Tarbaculite from the Carson belt of the D.B.B. Slyoe spathes and many Syngrea here. The modules with dark beds interrupted beeme mine are more prominent below. This a zone about 50 feet thick. Then a solid module dark blue beds with the modules in the layers for 25 feet