294 .m;\v yuuk state museum 



(liniciilt to (listiiiji^uish the line of divisiou be- 

 tween this forninvion and tlie Ilaniilton. At the 

 jioint wliei'o the division Ims been made the 

 shales suddenly become more arenaceous in 

 character though they still retain their black 

 color, except that when ex|iosed thev weather 

 bro>\n. The fossils are: 



1 Chonotos nuicronatus //. a 



2 (Jlyptocardia s])oclosa IT. a 



3 Coleolus tonuicinctiiiii //. v 



4 Goiiiatites discoideus //. c 



Feet Total 



On()n(ht(j(i liiiicstoiic 85^71 



A massive gray limestone in which lari>e quan- 

 tities of chert may be found in tliin layers. 

 According to the statement of Mr H. Ingraham, 

 who drilled a Avell through this formation about 

 a quarter of a mile south of Clarksville, the 

 upper nine feet are entirely clear of chert, below 

 this are 15 feet in which the chert is very abun- 

 dant. In the lower part of the formation chert 

 was encountered but in rather small quantities. 

 There is an outlier of this formation which 

 forms the top of the ridge east of the village, 

 and w^hen the Oniskethau creek cut through this 

 ridge the outlying area was cut off from the rest 

 of the formation. This outlier was mentioned 

 by Mr Darton who noted the infrequency of 

 such outliers in this formation.^ The measure- 

 ment of this formation was taken at the foot of 

 Bennett rather than Wolf hill, because the ex- 

 posure there ])ermitted it to be more accurately 

 done. The fossils are : 



1 Meristella iinisiilcata (Con.) H. r 



2 Leptaena rliomboidalis {Wild-.) If. d- C. r 



3 Atrypa reticularis (Lin.) Dal. aa 



4 A. spinosa H. a a 



5 Pciitaniorolla arata (Cod.) U. q 

 Stro])licodoiita coiicava //. r 



7 S. text i lis //. rr 



8 S|)ii-ifci- (hiodenariiis H. a 



9 S. inacnis If. (Y) rr 



10 Dalniaiiitos (Coroiinra) asiiectans {Con.) II. rr 



11 Phacops cristata vnr. i)ipa //. rr 



12 Platyceras dnniosnni Con. c 



13 C'.yrtocoras .s/>. rr 



14 Zai»lin-iilis -iirmitca (LrSucHr) Edw. d- H. rr 



15 Z. corniculum (LeSneur) Edir. d' H. rr 

 10 FoncslcUa bisoriata H. rr 



^N. Y. Stato (Jcol. l.'Mli An. \W\)'{, p. 242. 



