GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 313 



bur there are not much over 1 feet. At one point 

 near Binnewater the thickness decreases to I feet, 

 though its maximum here is 15 feet [see ante, fig. 

 331. In age this formation is approximately 

 equivalent to the Drayman shales of Schoharie, 

 and the Bertie of Western New York. 



Wilbur limestone 



Fossiliferous lime sandrock like the Cobleskill. 

 H a 1 y s i t e s eaten nlatus, Leptaena 

 r h o m b o i d a 1 i s and A t r y p a reticu- 

 laris characterize it. On Rondout creek the 

 Wilbur rests directly on the Binnewater quartzites, 

 but at Whiteport and Binnewater itself this lime- 

 stone is wanting. It thus appears to be only a 

 local phase of the base of the Rosendale cement, 

 the argillaceous lime niudrocks being deposited in 

 portions of the region, while in others Silurie 

 organisms were able to gain a foothold and flourish 

 for a time, adding their debris as lime sandrock 

 to form the Wilbur limestone. At the Wilbur 

 bridge section, a foot or two of the Wilbur lime- 

 stone underlies the Rosendale cement bed, and 

 grades downward into the Binnewater. 



Binnewater sandstone 



Light gray to buff and brown quartz sandrocks often 

 becoming quartzitic and generally in thin layers. 

 Minute cross-bedding is found in many of the beds. 

 At Binnewater and northward to Rondout the 

 Binnewater sandstones rest directly on the Hudson 

 river shales and sandstones while southward the 

 Shawangunk conglomerate and the red shales in- 

 tervene between them. 



High Falls shale 0-25 



In the vicinity of Rosendale and westward red shales 

 lie just below the Binnewater sandstone and above 

 the conglomerate. At Rosendale Darton records 

 25 feet of the red shales and 22 feet of the quartz 

 ites above the conglomerate. These shales were 

 called by Darton and others the Medina shales, but 

 Hartnagel has shown them to be of Salina age. and 

 used i lie term High Falls shale, from their expos- 

 ure at that locality. 1 



Feet 



0-8? 



0-22 



1 N. Y. State Palcontol. An. Kept. 100.",. 



