GEOLOGIC MAP OF THE BUFFALO QUADRANGLE 23 



tites, lamellibranchs and gastropods appeared in great numbers 

 and in species characteristic of the later Naples fauna. Dr Clarke 

 has for this reason designated the fauna of the Genundewah lime- 

 stone as a prenuncial fauria.^ Among the most interesting mem- 

 bers of this fauna are the following: 



Dinichthys newberryi Clarke Bellerophon koeneni Clarke 



Spathiocaris emersoni Clarke B. denckmanni Clarke 



Tentaculites gracilistriatus Hall Macrochilina pygmaea Clarke 



Protospirialis minutissima Clarke M. seneca Clarke 

 Manticoceras pattersoni var. stylio- Lunulicardium hemicardioides 



philum Clarke Clarke 



M. contractum Clarke L. encrinitum Clarke 



M. fasciculatum Clarke Honeoyea styliophila Clarke 



M, nodiferum Clarke Pterochaenia fragilis Hall 



O-ephyroceras genundewa Clarke P. sinuosa Clarke 



Tomoceras uniangulare {Conrad) Buchiola? livoniae Clarke 



Loxonema noe Clarke B. scabrosa Clarke 



Pleurotomaria gentindewa Clarke Paracardium. dons Hall 



Protocalyptraea styliophila Clarke P. delicatulum Clarke 



Phragmostoma natator Hall Melocrinus clarkii {Hall) Williams 



P. incisum Clarke Aulopora annectens Clarke 



West river shale 



Professor Hall separated the Genesee slate in order to indicate 

 its bituminous character by a distinct name. Subsequently the for- 

 mation here described as West River shale was incorporated into 

 the Genesee shale as upper Genesee shale, but the different litholo- 

 gic characters of the two, the absence of the bituminous character 

 in the upper shales and the intercalation of a distinct limestone 

 between the two have demonstrated the necessity of subdivision 

 and of separate designations. The term West River shale has been 

 proposed for these lighter shales, overlying the Genundewah lime- 

 stone [see N. Y. State Mus. Bui. 63. 1904. p. 59]. 



This formation consists mainly of fine dark gray or bluish black 

 shales, thinly laminated and highly fissile. They are slightly cal- 

 careous and become lighter colored on exposure. Layers of bitu- 

 minous black shale and thin limestone occur in the lower part. 

 Concretions and the septaria known as "turtle stones" are com- 

 mon in these beds farther east and also thin sandy flags occur, 

 though rarely. 



The West River shale is 12 feet thick, where exposed on the 

 -south branch of Smoke's creek above the upper railroad bridge at 

 Windom. 



iState Geol. An. Rep't 1896. 1899. p. 38; N. Y. State Mus. Mem. 6. 1904. p. 203. 



