OF DENISON UNIVERSITY. 
75 
of the 26 in. layer in the other quarry; and the 3^ in. and 2^ in. 
layers might be combined so as to correspond to the 7 in. layer. 
Above this point comparisons would perhaps prove treacherous. 
Above the Dayton stone proper are found shaly layers, 50 in. and 9 in. 
thick, which do not sufficiently approach the crystalline character of 
the Dayton stone to be classed with it. 
MISCELLANEOUS QUARRIES. 
In addition to the quarries just mentioned, one or two others are 
worthy of at least a slight reference in this paper. 
Fauver's Quarry. 
About two miles north of Dayton, some distance west of the Cov- 
ington pike, is a quarry which displays both the Clinton and Niagara 
groups. The quarry presents some peculiar features which will be 
made a special object of investigation for the next paper. The Clin- 
ton ends above in a layer of blue clay, succeeded by a number of 
courses of Dayton limestone, none of which attain any great thickness. 
The blue clay layer, besides the usual fossils of the Clinton Group, 
has also furnished a specimen of Eichwaldia reticulata, Mr. E. M. 
Thresher being the collector. 
Fair Haven Quarry. - 
In Preble county, half a mile north of the village of Fair Haven, 
in a stream entering Four Mile Creek, a quarry has been opened, giv- 
ing an exposure of the Clinton. Here there have been found numer- 
ous corals so far not known elsewhere in this State, and also the usual 
Clinton forms. Among others, a form of Clathropora Clintonensis , 
with unusually large oval openings (passing entirely through the bryo- 
zoum and thus forming the branches of the reticulations, ) deserves spe- 
cial mention. A species of Ptychophyllum, in a fine state of preser- 
vation, occurs here; a similar, if not identical form, being found at 
Allen’s Quarry. The exposure does not give a complete section, 
but over four feet of the Clinton Group are exposed. 
About two miles north, along Four Mile Creek, another quarry has 
exposed the higher strata of the Niagara group. Its peculiar feature 
is a seam of cherty limestone, about nine inches thick, containing 
Atrypa reticularis in well preserved specimens. No other fossils have 
so far been noticed. 
