THE DELAWARE LIMESTONE 439 



The remaining part of the quarry has thicker-bedded layers, up to 

 eighteen inches in thickness, although there are thinner ones used 

 for flagging. The thicker layers which are used for building stone 

 are brownish on fresh fracture, but, according to Mr. Wagner, weather 

 to a bluish tint, and do not contain iron. In the lower part of the 

 quarry is quite a massive layer, in which Chonetes sp. is common; 

 but above this layer there are comparatively few fossils. In the upper 

 layers, however, which are somewhat crinoidal, occasional specimens 

 of Stropheodonta demissa (Con.) Hall, PhoUdostrophia iowaensis 

 (Owen) Schuchert, Liorhynchus laura Billings ( ?), and Paracyclas 

 elliptica Hall ( ?) were seen. Much of this upper rock is marked 

 with lines of bedding, and it is apparently quite an impure limestone. 

 To the west of the Wagner quarry, and just south of the Soldiers' 

 Home, is the Hartman quarry, in which eighteen feet of rather even- 

 bedded brownish rock is shown. This quarry extends stratigraphic- 

 ally about seven feet deeper than that of the Wagner Stone Co., and 

 the rock is used largely for building. Fossils occur with about the 

 same frequency as in the Wagner quarry, and the upper part of the 

 rock is slightly crinoidal, similar to the upper layers in the former 

 quarry. Both quarries show very little chert in any of the layers or 

 partings. 



CORRELATION OF LIMESTONE IN AND NEAR SANDUSKY 



The Wagner and Hartman quarries just south of the Soldiers' 

 Home and outside of Sandusky are correlated with the Delaware 

 limestone of central Ohio. 



The limestone in the Schoepfle and adjacent quarries in the city 

 of Sandusky was named the "Sandusky limestone" in 1873 by Dr. 

 Newberry, 1 who gave the localities at which it is quarried as Sandusky 

 and Delaware. It has already been stated in this paper that at the 

 time of Dr. Newberry's investigations the Schoepfle quarry was 

 opened and studied by him ; but the present quarries in the Delaware 

 limestone to the south of the Soldiers' Home had not been opened. 

 In Dr. Newberry's "Review of the Geological Structure of Ohio," 

 published in the last strictly geological report issued under his direc- 

 tion, the name " Sandusky limestone " is retained for the upper division 



1 Report of the Geological Survey of Ohio, Vol. I, Part I, p. 143. 



