GEOLOGY OF THE HONEOYE-WAYLAND QUADRANGLES 15 



Diaphorostoma lineatum (Conrad) 

 Lyriopecten orbiculatus Hall 

 Spirifer mucronatus Conrad 

 Sp. granulosus (Conrad) 

 Heliophyllum halli Edwards & Haime 

 Favosites argus Hall 

 F. arbusculus Hall 

 Eridophyllum sp. 



Heads of Megistocrinus and other crinoids are sometimes found 

 in the soft shale that immediately overlies the limestone. 



MOSCOW SHALE 



Succeeding the Tichenor limestones there are 147 feet of shale, 

 in which calcareous concretions and thin calcareous lenses, com- 

 posed largely of crinoid and other fossils, are common. The 

 principal part of the shale is light bluish gray and quite calcareous, 

 but at some horizons it is quite dark. Iron pyrite in nodules 

 is common, specially in the upper beds and occasionally occurs in 

 the shape of casts of small fossils. 



East of Canandaigua lake the upper limit of this formation 

 is the base of the Tully limestone which does not extend west of 

 the town of Gorham, Ontario county, but in its place there is found 

 at some exposures a thin layer of iron pyrite separating the blue 

 Moscow shale from the black Genesee. 



The upper part of the Moscow shale, with overlying pyrite layer 

 and Genesee shale, is exposed along Hemlock creek south of Rich- 

 mond Mills, and the base of the formation on Gates creek (some- 

 times called Beebe brook). Its place in the Livonia shaft section 

 is 280 to 427 feet from the top. 



This formation is very rich in fossils. For lists of species see 

 1 3th Report of the State Geologist, volume i, 1893, and State 

 Museum Bulletin 63. 



PYRITE LAYER. HORIZON OF TULLY LIMESTONE 



The formation ot hard limestone, named from its best develop- 

 ment at Tully, Onondaga county, where it has a thickness of 28 

 feet, thins out toward the west and disappears on the east side of 

 Canandaigua lake. Westward across the Canandaigua and Honeoye 

 quadrangles lentils of iron pyrites from one to four inches thick and 



