DELAWARE COUNTY. 289 
No. 22. Limestone in thin or slaty beds, so contorted and yet ag- 
glomerated by chert: (which forms nearly one-half of the 
mass) that the whole seems massive; the chert is dark.. 3 ft. 6 in. 
“ 93. Beds of blue limestone of four to ten inches, alternating 
with chert beds of one to four inches; these limestone 
layers weather into beds of one to two inches............... 4“ 
‘‘ 94, Thin slaty beds, with alternating chert beds, the latter 
about an inch thick; where this number forms the bed 
of the creek it does not appear slaty, but massive and 
smooth, like a very promising building stone; the creek, 
where it enters the river bottoms, is on this number, 
AMG STO’ MMEPMOREHSISCEM crew a sae tabate an enon ee consencncr Gey 
STR tell Merete ere NA TAC NE ile ne Wile had san ia AS oe rd 0) Be 
These limestone beds have been quarried for the building of Mr. 
Bartholomew’s residence. They are none of them conspicuously fossil- 
iferous. 
Hamilton and Upper Oorniferous.—These names are here associated, be- 
cause whatever Hamilton fossils have been found in the county have 
been detected in that formation that has been described in reports on 
other counties as Upper Corniferous, and because it seems impossible to 
set any limit to the downward extension of the Hamilton, unless the 
whole of the blue limestone be Hamilton. ‘he shale which has,been 
descri}.d as Olentangy shale was at one time rezarded as the only equiv- 
alent of the Hamilton, from the occurrence of H. milton fossils in a shaly 
outcrop at Prout’s Station, in Hrie county. But after the survey of the 
county revealed no fossils in that shale, it became evident that it could 
not be the equivalent of the very fossiliferous outcrop at Prout’s Station, 
and should not bear the name of Hamilton. That shale partakes much 
more largely of the nature of the Huron than cf the Hamilton. The 
name Corniferous is made by Dr. Newberry to cover the whole interval 
between the Oriskany and that shale, the Hamilton being regarded as 
running out into the Corniferous, its fossils mingling with typical Corn- 
iferous fossils. In the State of Michigan, however, the term Hamilton 
has been freely applied to these beds, the Corniferous, if either, being 
regarded as reduced. The lithological characters of the Michigan Ham- 
ilton are the same as those of the Upper Corniferous in Ohio, and it is 
hardly susceptible of doubt that they are stratigraphically identical. In 
Ohio there is a very noticeable lower horizon that should limit the Ham- 
ilton, if that name be applicable to these beds, and if paleontological 
evidence will not limit it.* 
* A few words of explanation are necessury in connection with the remarks of 
Prof. Winchell, which follow: 
Ist. The shale bed, which is described above u:.der the name of Olentangy shale, 
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