68 NEW YORK STATE MUSEUM 



There are many small exposures of this part of the Chemung group 

 along the roadsides and in small gullies on these quadrangles, but 

 none that show more than a fraction of the rock section. It is 

 well displayed, however, along Caneadea creek and in other ravines 

 on the next quadrangle south of the Portage. 



At 1700' A. T. on the Allegany road 4 miles southwest of Pike 

 there is manifest a considerable change in the conditions of sedi- 

 mentation, soft shales no longer predominating, but a series of 

 flags and sandstones, many of which contain brachiopods in large 

 numbers, appears and is exposed along the roadside showing a 

 thickness of 150 feet or more, above which the rocks are covered 

 by drift, but blocks of compact quartzitic gray sandstone, very 

 coarse in structure and in some parts having the composition of a 

 fine conglomerate, are scattered over the fields or built into the 

 fences in such quantities as to make it evident that it is the bed 

 rock in the vicinity of the crossing of the Allegany road and the 

 east and west road near the south line of the quadrangle. There 

 is no other favorable exposure of these sandstones on these quad- 

 rangles but they are amply displayed in the Belfast quadrangle. 



Fossils are not abundant in the strata succeeding the Wiscoy 

 shales for 400 feet except in a few thin seams in the lightest shales 

 and in the heavier of the sandstones. The following species have 

 been collected from the stratum succeeding the Wiscoy shale as 

 Long Beards Riffs and Wiscoy: 



Spirifer disjunctus Sowerby Atrypa aspera Hall 



S. mesacostalis Hall Camarotoechia sp. 



Liorhynchus multicosta Hall Orbiculoidea alleghania Hall 



Productella lachrymosa Conrad Orbiculoidea cf. media Hall 



P. speciosa Hall Ambocoelia umbonata (Conrad) 



P. hirsuta Hall Lingula cf. melie 



and several unidentified species. These are the prevailing forms 

 that appear in the lower Chemung beds on these quadrangles and 

 most of them continue up into the heavy sandstones where they are 

 much more abundant and where other species are added to the 

 fauna. 



Dip 



The rocks of these quadrangles show very little evidence of dis- 

 turbance except in an even gentle dipping toward the south-south- 

 west. The line of contact between the Moscow shales and Genesee 

 slate has a westward declination of about 10 feet in the 55 miles 



