760 NEW YOIIK STATE MUSEUM 



the neigliborliood of Chittenango Falls, Madison co.;' and the 

 statements in the text shonld be correspondingly qnalified. 



The members of this formation enter the state at the south- 

 eastern corner just east of Port Jervis (]^. Y.) following up 

 the southeastern side of the ^eversink river, Bashers kill, and 

 Rondout creek, throughout this Avhole distance resting on the 

 Shawangunk grit which forms the crest of the Shawangunk 

 mountain. From Kingston the same formation extends north- 

 ward past Catskill to l^ew Baltimore, where it then swings to 

 the northw^est, extending as far as ^ew Salem in Albany county. 

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

 a somewhat broad belt just w^est of Meadowdale in the same 

 county 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 w^estward to I^iagara Falls. Up to Dennisons Corners the 

 formation, though of considerable thickness, does not cover a 

 very broad belt, owdng to the perpendicular escarpment which it 

 forms, but its thickness remains about the same from Syracuse 

 westward to Buffalo, and the elevation of the escarpment de- 

 creases. 



The Tentaculite limestone forms the low^er 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. 



As the Helderberg limestones are of considerable thickness in 

 !N^ew York state, it may be well to mention them in detail. This 

 can best be done by quoting from the report of E^. H. Darton.-"- 



The Helderberg limestones attain their greatest development 

 in eastern l^ew York, and the thickness reported by Davis of 

 about 300' feet in the Catskill region is the maximum. & They 

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

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



1 Report on the relations of the Helderberg limestones and associated forma- 

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



