DELAWARE COUNTY. 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 Olentangy 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 shew so dark a color, but varies to 
a biue. It occurs there in even, thick courses, that would be extremely 
difficult te 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 
halffeet. 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 bard 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 limestone 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—Oyrtia Hamiltonensis, Spirifera 
mucronata, Strophomena (rhomboidalis ?), Strophomena demissa —and one or 
two species of Descena, 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 Hamitton at DELAWARE, On1o—QUARRY or C. W. LitTLE. 
No. 1. Beds thin (because weathered) and faded, showing rather 
gray than blue, fossiliferous with bivalves, specially with 
Strophomena (rhomboidalis ? ), SHOWN .......6 see ceeseesee sesescess 2 feet. 
“ 2. Thin, irregular beds, consisting mostly of chert nodules... 2 “ 
