THE SUNBURY SHALE OF OHIO 275 
the bank and in the bed of the creek are magnificent examples 
of ripple marks in the fairly thin layers of Berea sandstone. 
Just above the highway bridge is an old quarry in the upper 
part of the Berea grit, some of the layers of which are bluish in 
color. Capping the sandstone is the lower two feet or more of 
Fic. 1.— Contact of Berea sandstone and Sunbury shale on Rocky Fork, two 
miles northeast of Gahanna. The thin bedded Sunbury shale is shown in the upper 
part of the cliff resting on a thick sandstone layer at the top of the Berea. 
the black argillaceous Sunbury shale, and at this locality the 
clearly shown contact of the two formations may be closely 
examined. The black shale splits into thin layers, and one of 
these, a few inches above its base, contains abundant specimens 
of Lingula mele Hall and Orbiculoidea Newberryt (Hall), Herrick,’ 
together with fragments of fish bones and teeth. Farther up the 
creek, on the same bank, 8 feet or more of the shale is shown. 
On the eastern bank of the creek, not far above the highway 
«Mr. Schuchert refers this species to Whitfield’s genus of Liwgzlodiscina (Bull. 
U.S. Geol. Surv., No. 87, p. 261). 
