36 Bulletin of Laboratories of Denison University [Voi. xi. 
at the present time. It is burned for lime, and is used for foun- 
dation purposes. 
About 3 feet above the bottom of the quarry is an irregu- 
lar band of chert a few inches in thickness. This is almost as 
white as chalk, and when wet is very soft, so that it works al- 
most as easily as chalk. It is highly fossiliferous, as is shown 
by the fact that of the following species all but 6 came from 
this band : 
Anthozoa. Zaphrentis prolifica. Bill. 
BraeJiiopoda, Atrypa aspera. Schloth., Atrypa reticularis. 
Linn. , Chonetes acutiradiatus. H. , Chonetes mucronatus. M. & 
H. , Crytina hamiltonensis. H., Orbiculoidea. sp., Pholidostro- 
pliia nacrea. H., Rhipidomella livia. Bill., Rhynchonella Caro- 
lina. H., Rhynchonella tethys. Bill., Schizoporia propinqua. 
H., Spirifera acuminata. Con., Spirifera mucronata. (?), Spiri- 
fera oweni. (?) H., Stropheodonta hemispherica. H., Strophe- 
odonta perplana. Con. 
LaniellibraneJiiata. Conocardium cuneus. Con., Glypto- 
desma erecta. Con. 
Gastropoda. Bellerophon pelops. H., Platyceras cari- 
natum. H. 
Crustacea. Proetus crassimarginatus. H. 
The most characteristic fossil at this point is Glyptodesma 
eiccta. It occurs in large numbers in the chert band already re- 
ferred to, but is rare or absent elsewhere. It is found in larger 
numbers for corresponding thickness of stratum than any other 
lamellibranch in the Corniferous beds. The genera PJiolidos- 
trop/iia and Orthis are also common. Of the former the species 
P. nacrea is of special interest since the only other place in the 
state where it is common is White House. The form .S', perplana 
is relatively more abundant here than elsewhere. Of the genus 
Ort/ds, the species livia is by far the most common. This is 
the only place found where this species is more abundant than 
O. propinqua. The form found is nearly always the dorsal valve, 
and is smaller than those which occur elsewhere. The Spirifera 
are of considerable interest. The species S: acuminata is found 
and with it a closely related form which has been referred doubt- 
