Handbook of Paleontology 399 



by the Naples fauna ; in central New York by the Naples- 

 Ithaca fauna (the latter in Sherburne and Ithaca beds). 

 In eastern New York the marine Sherburne and Ithaca 

 beds carry the Ithaca fauna (marine), the Oneonta beds 

 are nonmarine. The term Naples beds (Clarke '85) has 

 been applied to the formations carrying the Naples fauna, 

 an alien fauna with Manticoceras (intumescens) pat- 

 tersoni. The Portage beds have an aggregate thickness 

 of 1000 to 1500 feet, and as here denned begin with the 

 Genundewa limestone. The Genundewa limestone 

 (Clarke '03; Luther) is a thin band of impure limestone 

 described as the "Styliola band" and also "Styliolina lime- 

 stone" because of the immense numbers of the pteropod 

 Styliolina fissurella occurring in it. It received its pres- 

 ent name from the exposure at Genundewa point, Can- 

 andaigua lake. This limestone band has a thickness of 

 eight feet more or less and is found from Cayuga lake 

 valley westward to Lake Erie. Fossils are abundant in 

 this formation, and besides those found in the Genesee 

 black shale there occur other species characteristic of the 

 later Naples beds. This limestone has also afforded many 

 conodonts. Succeeding the Genundewa limestone are 

 dark gray shales (12 to about 100 feet) with interstrati- 

 fied beds of black shales. This is the West River shale 

 (Clarke and Luther '04) named from the West River 

 valley section, Yates county. Calcareous concretions are 

 common in these shales and a few thin flags of calcareous 

 sandstones occur. In the Cayuga and Seneca lakes region 

 the term has been used to embrace the beds between the 

 Genundewa limestone and Cashaqua shale, that is, includ- 

 ing the Middlesex (Portage) shale. Fossils are rare in 

 the West River beds. Most of the fossils already listed 



