THE DELAWARE LIMESTONE 437 



Thickness Total Thick- 

 N _ (Feet) ness (Feet) 



2. Black carbonaceous layer at top, with hackle tooth f 4! 



structure. Tentaculites scalarijormis Hall is very abun- 

 dant in the lower part of this zone, but decreases toward 

 its top. 



1. Massive bluish-gray limestone for building, about 1 foot 4=b 4± 



of which is shown in this part of the quarry. Farther 

 east there is an anticline shown in this wall of the quarry, 

 and at its base beneath the crest about 4 feet of bluish- 

 gray, compact limestone is shown beneath the Tenta- 

 culite zone to water-level. There are some Tentacu- 

 lites in this lower rock, and in lithologic character it is 

 not very different from No. 3 above the Tentaculite 

 zone. 



The surface of the layer forming the floor of the quarry on the 

 northern side shows conspicuous ripple marks, which run about N. 30 

 W. and S. 30 E., with an average distance apart from crest to crest 

 of about two feet. In the main, they measured from twenty-two to 

 twenty-six inches apart, but they are not all uniform in separation, 

 and occasionally two run together. This layer with the ripple marks 

 is apparently about five feet three inches below the Tentaculite one. 

 All of the rock in the walls of this quarry is of bluish-gray color, and 

 weathers smooth until the base of the coral and crinoidal layers is 

 reached. On the southern wall of the quarry these layers are con- 

 spicuous and project over the smooth underlying bluish-gray rock. 



On the western side of Hancock Street, to the southwest of the 

 Schoepfle quarry, and not far from the Lake Erie & Western Rail- 

 road, is a small abandoned quarry which, according to Mr. Schoepfle, 

 was opened in 1874 by John Carr and Philander Craig. Near the 

 top of the old quarry wall is a massive layer of bluish-gray limestone, 

 the upper part of which contains fish bones, while its upper surface 

 is rather rough and iron-stained, similar to the top of the Columbus 

 limestone in central Ohio. Below the bone-bed the limestone con- 

 tains numerous specimens of Brachiopods and corals, although they 

 are not well preserved. The distance of this excavation from the 

 southwest corner of the Schoepfle quarry is only a few rods, and the 

 dip is apparently in that general direction, so that probably the rock 

 of the Schoepfle quarry underlies the bone-bed of the Carr & Craig 



