BUFFALO SOCIF/TY OF NATURAE SCIENCES 41 



The Cashaqua shale is exposed in the lake cliffs at and above 

 the mouth of Pike creek. It is well shown in the cliffs of 

 Eighteen Mile gorge at and above the railway bridges where its 

 contact with both Middlesex and Rhinestreet is visible. It 

 forms a cliff and a long horizontal section in the south branch of 

 Smoke's creek at the dynamite storehouses. It is exposed in 

 Cazenovia creek about two miles above Springbrook and at East 

 Elma on Buffalo creek. The characteristics exhibited in all these 

 exposures are identical. 



Fossils are fairly abundant. A list given by Luther of 

 forms abundant in this vicinity follows: 



Goniatites: 



Probeloceras lutheri Clarke. 

 Gephyroceras holzapfeli Clarke. 

 G. cf. domanicense Holzapfel. 



Lamellibranchs: 



Lunulicardium pilosum Clarke. 

 Pterochaenia fragilis Hall. 

 P. elmensis Clarke. 

 Buchiola retrostriata v. Buch. 

 B. lupina Clarke. 



Gastropod: 



Loxonema noe Clarke. 



Rhinestreet Shale. 



The Rhinestreet shale comprises a thick mass of dark, 

 bituminous shales lying between the gray Cashaqua below and 

 the gray Angola shale above. Originally it was included in the 

 Gardeau shales. Later these were separated and the name Black 

 Naples shale was applied to this black band to distinquish it from 

 the underlying Gray Naples shale, now called the Cashaqua. 

 Its present name was given to it because of its exposure at 

 Rhinestreet near Naples. At its most eastward exposure at 

 Seneca lake it is but two feet thick. 



In Erie county it is a succession of fissile black shales, 185 

 feet thick, in thick beds alternating with thickly bedded, dense, 

 hard, black, slaty shale. The shale is highly bituminous and 

 emits a strong odor of petroleum when newly fractured. All the 



