O NEW YORK STATE MUSEUM 



The formations in this State which may be expected to yield rock 

 of good quality and which have been studied with that particular 

 purpose in view, are : 



a The Poughqiiag quartzite^ fringing the northeastern border of 

 Fishkill mountains, in Dutchess county ; another smaller outcrop lies 

 about three-fourths of a mile northwest of Peekskill, along Peekskill 

 creek, in Westchester county. 



b The Shawangimk conglomerate, which forms a prominent range 

 of mountains running southwesterly through Ulster and Sullivan 

 counties, and into Pennsylvania. 



c The Oriskany sandstone, at Oriskany Falls, Oneida county, the 

 type locality in the State of New York. 



d The Potsdam sandstone, which in general forms part of the 

 Paleozoic fringe around the Adirondacks ; and outliers of the same 

 formation in the Mohawk valley. 



e The Oneida glass sands, at the east end and on the north side 

 of Lake Oneida in Oneida and Oswego counties ; these sands at one 

 time were the source of supply for flourishing local glass industries 

 in the vicinity of the lake. There are other formations in this State 

 which might possibly furnish material of fairly good quality; these 

 are: 



/ The Whirlpool sandstone, at Lewiston, Niagara Falls, Niagara 

 county. 



g The Oswego sandstone, at the falls of the Salmon river, in 

 Oswego county. 



h The Oneida conglomerate, at Washington Mills, Oneida county. 



i A sandstone which lies at the base of the Lowville limestone, 

 scantily exposed at Little Falls, and which may possibly be seen at 

 Lowville. 



These formations were not studied in the field, however, partly 

 because of the time limit involved, and partly because either their 

 lithologic character is such, or the probable quantity of high-grade 

 material so questionable, as not to warrant investigation at this time. 



The discussion will be limited to the first five formations named 

 and will be divided in two parts : 



1 A general description of the rock and its structural habit ; the 

 lithologic character, chemical analyses, and locality for each forma- 

 tion individually, with suggestions as to operating facilities and 

 transportation. 



2 The various specific industries in which rock from the different 

 formations might be used, and whatever physical tests have been 

 made during the course of the investigation. 



