324 C. SCHUCH^RT — LOWER HELD ERBERG-ORISK ANY FORMATIONS 



In 1895 the present writer spent two days in collecting Oriskany fos- 

 sils for the United States National Museum, at localities about 6 miles 

 northwest of Cayuga. It is from these outcrops that all the Ontario 

 Oriskany fossils are derived which were collected through man) 7 years 

 by Mr John De Cew, furnishing Professor Hall his collections. These 

 the writer worked out when assistant to the New York State geologist, 

 and a list of them was published on pages 51-55 of the u Eighth Annual 

 Report of the State Geologist of New York, for the year 1888," issued in 

 1889. When this work was in hand, it was apparent that there had been 

 some mixing of Corniferous corals with those of the Oriskany fauna, 

 and a number of species were then eliminated. It now appears that 

 more of these corals must be removed from Professor Hall's Oriskany 

 collection, and a number are not included in the list given below. 



The unconformity between the Oriskany and the Waterlime groups 

 is not a marked one. A short distance east of Mr David Fleming's farm, 

 the Oriskany is 16 feet thick and rests on the evenly bedded or domed 

 Waterlime group. The contact is well shown, with the bottom of the 

 Oriskany somewhat uneven and filling the fissures in the Waterlime 

 group. On the farms of Mr Fleming and Mr Anderson, the sandstone 

 is not more than 6 feet thick and is abundantly fossiliferous. In other 

 closely adjacent places, the upper layers of the Oriskanj' are thin bedded, 

 containing rarely a Coral of Corniferous age. Above these layers is the 

 Onondaga chert. 



North of the quarry east of Mr Anderson's, the Oriskany is seen in 

 low domes, and in some of the depressions between them thin bedded 

 cherty limestones occur, preserving Biyozoa, trilobites, or an occasional 

 coral of Onondaga age. 



Upper Oriskany Fauna of Ontario. — The following forms were obtained 

 in Oneida and North Cayuga townships, Ontario, Canada : 



Favosites conicus Hall. Hall collection 



gothlandicus Lamarck. Geological Survey of Canada. 



herrmphericus Troost. Geological Survey of Canada. . 

 " turbinatus Billings. Geological Survey of Canada. . . 



sp. undet. 28054 



sp. undet. 28055 



HeliophyUum exiguum Billings. Geological Survey of Canada. . 

 Cystiphyllum sulcatum Billings. Geological Survey of Canada. 



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