GEOLOGY OF THE W ATKINS AND ELMIRA QUADRANGLES 1 9 



formation is mainly a laminated sandstone and is here crowded with 

 brachiopods. So conspicuous is the development of this formation 

 in the region from Dansville eastward, and so profuse and striking 

 its development of the Chemung brachiopod fauna that on the map 

 of the Naples quadrangle [N. Y. State Mus. Bui. 63] it was deemed 

 advisable to apply to it the term Prattsburg sandstone and shale in 

 preference to employing here the name Wiscoy, inasmuch as there 

 has been this fundamental change in the nature of the fauna. In the 

 Cohocton valley near. Atlanta, the sandstones are still harder and are 

 quarried for flagging and building stone. About Corning it has 

 become softer and on the area of this map there is a return to con- 

 ditions very similar to those at Wiscoy, so far as lithologic character 

 is concerned. 



This rock is exposed in the quarry near Pine City, 11 20 feet A. T. 

 and in that 1 mile west of the village of Southport, 1080 feet A. T. ; 

 along Hendy creek, from 1 to 3 miles west of the Chemung river, 

 920 to 1 180 feet Av T. : in a ravine on the south side of Hawley 

 hill, 960 feet A. T. and another iy 2 miles farther west, 1050 to 1200 

 feet A. T. ; at the soj.th end of the bridge over the Chemung river, 

 i J / 2 miles southwest from Big Flats at 920 feet A. T. The lower beds 

 are shown in a small ravine at 1160 feet A. T. along the first road 

 leading north in the Latta brook depression and the upper part a 

 mile to the southwest by the side of the road leading from Maby 

 hill; also in an old quarry 2 miles east of Horseheads at 1015 feet 

 A. T. and in a ravine on the east side of Carr hill at 1 1 50 feet A. T. 

 There are field outcrops on the south side of Johnsons Hollow and 

 the rocks are also seen in many small ravines on the northern part of 

 the Elmira quadrangle. 



Among the fossils occurring in the shales and sandstones of this 

 division are the following: 



Plumalina plumaria Hall P. speciosa Hall 



Chonetes scittilus Hall P. hirsuta Hall 



Spirifer mucronatus posterus Hall & Tropidoleptus carinatus Conrad 



Clarke Liorhynchus mesacostalis Vanuxem 



Sp. mesastrialis Hall L. multicosta Hall 



Sp. mesacostalis Hall Atrypa reticularis Linni 



Productella lachrymosa Hall A. hystrix Hall 



