DELAWAKE COUNTY. 1 291 



the shale outcropping there, under the head of the Huron Shale, and is 

 described as a black limestone, hard and crystalline. (No. 11, p. 90, of 

 the section at Delaware covering the Olcntangy shale.) It is also in- 

 cluded in No. 20 of the "section in the Olentangy shale, in Liberty 

 township." 



The exposure near Norton does not show so dark a color, but varies to 

 a biue. It occurs there in even, thick courses, that would be extremely 

 difficult to quarry except for the natural joints by which the layers are 

 divided into blocks. The same is true of its outcrop near Waldo. In 

 both places it is-a hard, ringing, apparently silicious, tough, and refrac- 

 tory limestone, some of the blocks being over two feet thick. It is a 

 very reliable building stone, but the abundance of pyrites that is scat- 

 tered through it makes it very undesirable for conspicuous walls. It is 

 exceedingly fine-grained, and but slightly fossiliferous. At these places 

 not more than four or five feet of this stone can be seen, but it has an ob- 

 served thickness in the southern part of the county of about nine and a 

 half feet. It seems to retain a persistent character, for the same stratum 

 is seen to form the top of the Upper Corniferous in Defiance county, on 

 the west side of the great anticlinal axis. It is believed to be the equiv- 

 alent of the Tully limestone of New York. 



Below these very hard and heavy layers comes the stone qUarried ex- 

 tensively at Delaware. The quarry of Mr. G. W. Little shows about 

 eighteen feet of bedding, in courses three to fifteen inches thick. It is 

 for the most part in a very handsome, evenly -bedded blue Hmestone that 

 shows some coarse chert, and, in places, considerable argillaceous matter, 

 which renders the walls built of it liable to the attacks of the weather. 

 The features of the Hamilton here seem very conspicuously blended 

 with those that have been designated more distinctively as belonging to 

 the Corniferous. The fossils are not abundant throughout the whole, but 

 between certain thin beds many bivalves — Cyrtia HamUtonensis, Spirifera 

 mucronata, Strophomena (rhomboidalis?), Strophomena demissa — and one or 

 two species of Discina, and various vermicular markings, are common. 

 In some of the heavier beds the fish remains that have been described by 

 Dr. Newberry, from the Corniferous at Sandusky, are met with, as well 

 as the large coils of Cyrtoceras undulatum. 



Mr. Little's section is as follows, in descending order, dip east : 



Section in the Hamilton at Delaware, Ohio — Quarry of C. W. Little. 



No. 1. Beds thin (because weathered) and faded, showing rather 

 gray than blue, fossiliferous with bivalves, specially with 



Strophomena (rlwmboidalis ?), shown 2 feet. 



" 2. Thin, irregular beds, consisting mostly of chert nodules 2 " 



