Handbook of Paleontology 401 



Rhinestreet shale (Clarke '03; Luther), the fauna is cur- 

 tailed again. These shales, named from the section along 

 Rhinestreet north of Naples, Ontario county, have a 

 thickness of about 200 feet in the Lake Erie region, but 

 thin eastward to Seneca lake valley where the thickness 

 is two feet. This is the "Upper black band" of the Por- 

 tage in older literature (Clarke '85). The Hatch flags 

 and shales (Clarke '03 ; Luther) following are arenaceous 

 beds (150 to 400 feet thick, more or less) named from the 

 abundant exposures on Hatch hill at Naples, Ontario 

 county. They are blue and olive shales with frequent thin 

 layers of black shale and thin sandstone. There is a par- 

 tial return to the conditions in the Cashaqua beds below, 

 but fossils occur in very decreased numbers. There is 

 an increase in the proportion of sand in the sedimenta- 

 tion eastward, and here there is evidence of alternations 

 of the normal Naples fauna with the Ithaca fauna of cen- 

 tral New York. The Angola shale (Clarke '03; Luther) 

 and Hanover shales (Hartnagel '12; formerly Silver 

 creek) farther west in Erie county have been considered 

 as equivalents of the lower and upper parts of the Hatch 

 shales. More recently (Chadwick '19) they have been 

 traced continuously into the higher horizon of the Wis- 

 coy shale. The Grimes sandstone (Luther '02) is a well- 

 defined arenaceous band, with a thickness of 25 to 75 feet, 

 composed of even layers of sandstone, some rather soft 

 and shaly, others hard and calcareous. The name is de- 

 rived from the exposure in Grimes gully near Naples, 

 and the formation extends from Cayuga county to not 

 far west of the Genesee valley. The eastern part of the 

 formation (to Naples) shows an invasion of a brachio- 

 pod (Ithaca) fauna from the east. This formation marks 



