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NEW YORK STATE MUSEUM 



The collector may expect to find the following species in the Cardiff 

 beds south of Union Springs : 



Phacops rana Green 

 Cryphaeus boothi Green 

 Homalonotus dekayi Green 

 Orthoceras subulatum Hall 

 Tornoceras discoideum (Conrad) 

 Tentaculites gracilistriatus Hall 

 Styliolina fissurella {Hall) 

 Pleurotomaria rugulata Hall 

 P. itys Hall 

 P. capillaria Conrad 



P. sulcomarginata Conrad 

 Camarotoechia sappho Hall 

 Spirifer audaculus Conrad 

 Strophalosia truncata Hall 

 Productella spinuHcosta Hall 

 Chonetes mucronatus Hall 

 C. scitulus Hall 



Liorhynchus Hmitare (Vanuxeni) 

 Ambocoelia umbonata (Conrad) 

 Orbiculoidea minuta Hall 



Skaneateles shale 



This name was applied to the beds next above the Cardiff as they 

 appear near the foot of Skaneateles lake, by Vanuxem in his annual 

 report for 1839; and in his final report on the Third District, 1842, it 

 is mentioned as the first or lowest member of the Hamilton group. 



It is a mass of dark soft clayey shale with some beds of black shale 

 interbedded but gradually assuming on the whole a lighter color 

 toward the top and contains some thin calcareous lenses composed of 

 fossils and occasional concretions. The lines of contact with the ad- 

 jacent formations are not clearly defined but on this quadrangle the 

 Skaneateles beds have an estimated thickness of 200 feet. They are 

 well exposed along the railroad between Aurora and Levanna and in 

 the ravines of Glen creek, Criss creek and in Great Gully brook, 

 also slightly just east of Fleming. 



Fossils are not so abundant in the Skaneateles shale as in the suc- 

 ceeding Ludlowville beds. The following is a partial list of the species 

 that may be found in this formation on these quadrangles : 



Ambocoelia umbonata (Conrad) 

 Tropidoleptus coronatus (Conrad) 

 Athyris spiriferoides (Eaton) 

 Leptostrophia perplana (Conrad) 

 Orbiculoidea media Hall 

 Chonetes coronatus Hall 

 C. mucronatus Hall 

 Spirifer audaculus Conrad 

 Productella splnulicosta Hall 

 Grammysia arcuata Conrad 



Plerochaenia fragilis [Hall) 

 Actinopteria boydi Hall 

 Modiomorpha subalata (Conrad) 

 Buchiola retrostriata (von Buck) 

 Nuculites corbuliformis Hall 

 Styliolina fissurella (Half) 

 Tornoceras discoideum' (Conrad) 

 Orthoceras subulatum Hall 

 Cryphaeus boothi Green 

 Phacops rana Green 



