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 fauna. 1 Among the most interesting mem- 

 bers of this fauna are the following: 



Dinichthys newbenyi Clarke 

 Spathiocaris emersoni Clarke 

 Tentaculites gracilistriatus Hall 

 Protospirialis minutissima Clarke 

 Manticoceras pattersoni var. stylio- 



philum Clarke 

 M. contractum Clarke 

 M. fasciculatum Clarke 

 M. nodiferum Clarke 

 Gephyroceras genundewa Clarke 

 Tornoceras uniangulare {Conrad) 

 Loxonema noe Clarke 

 Pleurotomaria genundewa Clarke 

 Protocalyptraea styliophila Clarke 

 Phragmostoma natator Hall 

 P. incisum Clarke 



Bellerophon koeneni Clarke 

 B. denckmanni Clarke 

 Macrochilina pygmaea Clarke 

 M. seneca Clarke 

 Lunulicardium hemicardioides 



Clarke 

 L. encrinitum Clarke 

 Honeoyea styliophila Clarke 

 Pterochaenia fragilis Hall 

 P. sinuosa Clarke 

 Buchiola? livoniae Clarke 

 B. scabrosa Clarke 

 Paracardium doris Hall 

 P. delicatulum Clarke 

 Melocrinus clarkii {Hall) Williams 

 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. 



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



