T74 NEW YOEK STATE MUSEUM 



occur under tliem at several points. Borings were made by the 

 writer across the swamp at a point two miles north of Union 

 Springs but no marl was found. 



Chautauqua county^ 



The only lime deposits are a few scattered beds of marl. The 

 most important is on Cassadaga lake, and a Portland cement plant 

 was erected at this point several years ago, but is now closed 

 down. 



Clinton county ^ 



Calciferous. Rocks of this age are abundantly exposed in 

 Champlain, Beekmantown and Peru townships. The rocks are 

 usually blue gray, massive, sandy dolomites. Owing to their 

 sandiness they have little value for the manufacture of lime or 

 cement. 



The Trenton and Chazy limestones occupy a broad belt which 

 extends along the western side of Lake Champlain from Peru 

 northward to the Canadian boundary, the western edge passing 

 close to West Chazy, Chazy and Coopersville. 



Chazy limestone. This limestone is well exposed at the village 

 of Chazy as well as in other parts of Chazy township, specially 

 just north of Plattsburg, and on Bluff point two miles south of 

 the latter place, whence it extends south into Peru, where the 

 lower portion of the formation is well shown. The aggregate 

 thickness of the Chazy limestone at Chazy village is T40 feet, 

 while at Yalcour it is said to be 890 feet. The rock is quarried at 

 a number of points for obtaining marble, rough building stone 

 or stone for lime. 



Blach river limestone. The rocks of this group occur as mas- 

 sive dark colored beds, but are well exposed at numerous points in 



iHall, James, {see Geol. 4th dist. N. Y. p. 493) 



2 Gushing, H. P. Geology of Clinton county, {see 13th an. rep't N. Y. state 

 geol. p. 513) 



Faults of Chazy township, Clinton co. {see Bui. geol. soe. Am. 6: 28.5) 



• Geology of Rand Hill and vicinity, Clinton county, {see 19th an. 



rep't N. Y. state geol. p. 39) 



Emmons, Ebenezer. Geol. 2d dist. N. Y. 1842. 



