7G0 NEW TOES STATE MTJ8EUM 



the neighborhood of Chittenango Falls, Madison co.; and the 

 statements in the text Bhould be correspondingly qualified. 



Tin- members of t.his formation enter the state at the south- 



stern corner just of Port Jervia (X. Y.) following up 



the southeastern tide of the Neversink river. Bashers kill, and 

 Rondoul creek, throughout this whole distance resting on the 

 wangunk grit which forms the crest of the Shawangunk 

 mtain. From Kingston the same formation extend- north- 

 ward i -• CatskiU to New Baltimore, where it then swings to 

 the north standing as far as New Salem in Albany county. 



At this point it becomes very narrow; it however appears again as 

 a somewhat broad belt just west of Meadowdale in the same 

 count v and then extends westward as far as Central Bridge in 

 Schoharie county, and from there in a slightly northwest direc- 

 tion past Sharon Springs, Dennisons Corners, Oneida, Syracuse, 

 and westward to Niagara Falls. Up to Dennisons Corners the 

 formation, though of considerable thickness, does not cover a 

 very broad belt, owing to the perpendicular escarpment which it 

 forms, but its thickness remains about the same from Syracuse 



3tward to Buffalo, and the elevation of the escarpment de- 

 creases. 



The Tentaculite limestone forms the lower member of the 

 series and is generally a dark colored, thin to thick bedded, at 

 times argillaceous limestone. It seldom reaches a condition of 

 great purity and aside from the cement beds which are worked 

 separately its chief use has been for building purposes. 



Aj the Helderberg limestones are of considerable thickness in 

 New York state, it may be well to mention them in detail. This 

 can best be done by quoting from the report of N. IT. Darton. 1 



The Helderberg limestones attain their greatest development 

 in eastern New York, and the thickness reported by Davis of 

 about 300 feet in the CatskiU region is the maximum. They 

 thin gradually southward in New York, but expand again in New 

 Jersey. In the Helderberg mountains there are 200 feet and at 



i Report on the relations of the JJelderberg limestones and associated forma- 

 tions in eastern New York, {ace 13th an. rep't N. Y. state geol. p. 204) 



