77. N. Eaton— Orishany Sandstone Faunide. 427 



Aet. XXX. — The Oriskany Sandstone Faimule at Oris- 

 kany Falls, New York;^ by Harky N. Eaton. 



During the course of f aunal studies of the Oriskany of 

 central New York it seemed advisable to visit the type - 

 locality at Oriskany Falls whence the f ormational name 

 was derived. As the result of several days' collecting in 

 July, 1919 a faunule was found which is probably repre- 

 sentative, and is enumerated below. 



Extent and Stratigraphy. 



The sandstone outcrops in a bold ledge on the hillside 

 on the northern outskirts of the tillage of Oriskany Falls 

 at an elevation of about 1080 feet. This hill is a plateau 

 spur pointed southward, broadening out to the north in 

 the southern part of Oneida County; bounded on the 

 east by the valley of Oriskany Creek, and on the west by 

 the valley of Sconondoa Creek. The outcrop is nearly 

 unbroken for a mile northward of the village in the Oris- 

 kany Creek valle}^, and thence northward there are no 

 further exposures owing to the drift cover. On the 

 western side of the hill it can be traced by a line of 

 bowlders, rising gradually to an altitude of 1260 feet to a 

 point about 1% miles north of the village of Augusta, in 

 harmony with the gentle southerly dip of the region. 

 On account of the drift cover, the northern boundary of 

 the formation is uncertain, but probably does not lie more 

 than 3% miles north of Oriskany Falls. The greatest 

 breadth east and west is about 1% miles. 



The thickness was given by Vanuxem- as ^ ' about twenty 

 feet," but Brigham's^ estimate of ''about ten feef is 

 more in accord with the writer's measurements. Van- 

 uxem 's error was a natural one to make at the outcrop 

 nearest the village, as at this place a row of large sand- 

 stone blocks has been plucked away from the parent ledge 

 and moved a few feet downward so as to give the forma- 

 tion a double apparent thickness. 



The Oriskany sandstone at this locality lies directly 

 upon the Helderberg limestone, — or Manlius according 



^ The above paper was read before Section E, A. A. A. S., at St. Louis, 

 Dee. 30, 1919. An abstract was published in Science, new ser,, 51, 493, 1920. 



2 L. Vanuxem, Third Ann. Eept. Geol. Survey, Third Dist. N. Y., p. 273, 

 1839. 



^ A. P. Brigham, The Geology of Oneida County, Oneida Hist. Soc, Trans., 

 1887-1889, p. 109, 1889. 



