316 



NEW YORK STATE MUSEUM 



Unconformity (covering the interval from about Middle Cham- 

 plainic to Upper Siluric (Salina). 



Hudson river strata ranging in age from Normanskill (Middle 

 Trenton) or earlier to Lorraine, and of unknown thickness. 



In structure the cement region is a series of symmetric anti- 

 clines and synclines of the Appalachian type [fig. 206-7]. This 

 has been described by Lindsley 1 , Dale 2 , Davis 3 , Darton 4 , and for 

 the northern region by van Tngen and Clark"'. Tn the Kingston 

 region the structure is further complicated by faults which have 

 been worked out with much care by van Ingen and Clark. One 

 of the most important of the faults is the great overthrust on 

 North hill, Kingston, by which many of the strata are repeated, 

 the Eondout waterlime resting on the lower Port Ewen beds 

 [fig. 208]. 



1 Poughkeepsie Proc. Soc. Nat. Sci. 2 : 44-48. 



2 Am. Jour. Sci. ser. 3. 16 :293-95. 



3Mus. Comp. Zool. Bui. 7:311-29; and Am. Jour. Sci. ser. 3. 26:389-95. 

 4 N. Y. State Geol. 13th An. Rep't. 1:291-372. 



5 N. Y. State Paleontol. An. Rep't .1902; N. Y. State Mus. Bui. G9. p. 1176- 

 1227. 190a 



