CANANDAIGUA AND NAPLES QUADRANGLES 



35 



Ambocoelia, Leptostrophia mucronata, etc.; the 

 first appearance of this fauna in this section and to be re- 

 garded as an incursive appearance of the Ithaca fauna lying 

 farther to the east. This formation lies 599 feet above the 

 base of the Middlesex black shale and this is the thick- 

 ness to be ascribed to the Portage formation in this merid- 

 ian as formerly defined. In the Tannery gully on the 

 east side of the Naples valley the upper beds have afforded a 

 number of singular organisms associated together but not con- 

 curring with species of the characteristic Naples fauna. These 

 are specially noted elsewhere and consist of the fossil Parop- 

 sonenia, believed to be an aberrant echinoid, some forms of 

 annelids described as Protonympha and Palaeochaeta, also a large 

 Orbiculoidea, some strange and undescribed linguloids, etc. The 

 division occurs also at the Naples reservoir, in the escarpment on 

 Hatch hill, in the Caulkins gully and the quarry near it, at the 

 top of the dngway on the Hunts hollow road, in the road near 

 Freeds and along the hillside northward to Rhinestreet, also 

 near the Muck place on Seaman hill and in the small ravine near 

 the Gardner property, 2 miles north of Bristol Springs. In 

 Bristol hollow it appears in the upper parts of the Randall and 

 Reed gullies and on the north side of Worden hill; in the 

 Honeoye valley on the hillside above E. Alger's property and 

 northward to the upper part of the Briggs gully. 



"West Hill flags and shale 



Light bluish gray sandstones or flags from 2 to 12 inches thick, 

 separated by beds of dark blue, olive or black shale. The sand- 

 stones are -sometimes quite calcareous owing to the presence of 

 crinoid stems and other fossils usually in fragmentary condition. 

 Thickness 550 feet. This heavy mass of arenaceous deposits like 

 the Hatch beds below is partially equivalent to the Gardeau 

 series of Hall as developed in the Genesee valley. It has however 

 undergone a change faunistically, and remains of the Naples 

 fauna are now no longer seen, though the rocks contain fossils 

 in some measure; but these are largely brachiopodous and indi- 

 cate continued presence of the Ithaca fauna. The sandstones are 



