284 Forty-sixth Report on the State Museum. 



A little higher than 505 B, capping the top of that hill and forming 

 all the high land between Butternut creek and the Susquehanna river 

 are red shales and sandstones alternating with gray shales and sand- 

 stones. 



At Oneonta, in the Susquehanna river valley, is an excellent oppor- 

 tunity to study the transition from the f ossilif erous rocks up into the 

 barren reds and grays of the Oneonta sandstone formation. A short 

 distance west of the village is the Anthony White quarry, which 

 exposes 15' of bluish sandstone separated by shaly layers into three 

 strata. 



Fauna of No. 507 B^. 



1 . Spirifer mesastrialis, Hall (a).* 



A good many specimens show fine striae very distinctly, and also 

 irregular perforations in the shell substance, which are probably 

 the borings of some parasite. 



2. Spirifer mucronatus, Conrad (rr). 



A single ventral valve, with quite long mucronate extremities, 

 seventeen plications on each side, and a distinct fold in the bottom 

 of the sinus. 



3 . Chonetes deflecta^ Hall (aa). 



About 26 striae, cardinal angles flattened and smooth, quite 

 gibbous. 



4. Mhynchonella Stephani, Hall (c). 



5. Spirifer ziczac, Hall (?) (rr). 



Impression of dorsal valve showing about six plications, with 

 mesial depression in the fold. 



6. Rhynchonella Sappho, Hall (rr). 



7. Tropidoleptu8 carinatus, Conrad (rr). 



8. Nucula hellistriata, Con. var. (a). 



The specimens are all smaller than those figured in the Palaeon- 

 tology of New York; but they have the fine striae and general 

 form of this species. 



9. Palceoneilo maxivna, Con. (c). 



10. Microdon (Cypricardella) hellistriatus, Con. (r). 



The striae are finer than those of the typical Hamilton specimens, 

 but similar to those from Ithaca and Port Crane, Broome county. 

 New York. 



11. Goniophora cariiiata, Conrad (rr). 



12. JVyassa arguta, Hall (r). 



* a = abundant, c = coraraon. r = rare, aa = very abundant, cc = very common, rr = 

 very rare. 



