260 



NEW YORK STATE MUSEUM 



Feet Inches 



4 Verv thin bedded lime mudrocks, in layers often a 

 quarter of an inch or less in thickness. They are 



finely stratified and contain much clay, and oc- 

 casionally lenslike masses, a few inches thick, of 

 lime sandrock. Weathers gray and brown. No 



fossils. About 10 



3 Cement bed.' Lime mudrocks with fragments of 

 Favosites, also small heads in the lower portion. 

 The rock has a conchoidal fracture, is bluish gray 

 when fresh but weathers brownish 6 



Total Kondout 48 



2 Cobleskill 6 



1 Brayman shales exposed 30 



Total 126 1) 



11 Section of north end of Moheganter hill 



Prosser 



On the eastern side of the river one mile south of Middleburg 

 and about east of the prominent hill on the western side of the 

 river known as Vroman's Nose, are ledges of sandstone and shales 

 along the lower slope of the northern part of the Moheganter hill. 

 The base of these rocks is approximately 160 feet above the Scho- 

 harie river at Middleburg and 200 feet of the section was studied, 

 the upper ledge being a heavy sandstone stratum. The dip is 

 heavy, being 2^° s. 85° w. in one place thai was measured and 

 on another ledge 2J° s. 50° w. The lowest rocks are not very 

 coarse but rather argillaceous shales in which fossils are rare. 

 Then the shales change to a coarse texture, are more arenaceous, 

 Spirifer g r a n u 1 o s u s (Con.) Hall is common and a few 

 other species occur. Above is a bluish, blocky sandstone suc- 

 ceeded by arenaceous shales in which Chonetes coro- 

 natus (Con.) Hall is common. And so the slope of the hill is 

 terraced by ledges of sandstone and coarse shales which dip quite 

 rapidly to the south. In the lower arenaceous shales and blocky 

 sandstones fine specimens of S p i r o p li y 1 o n v e 1 n m (Van.) 

 Hall are common. These rocks are all in the Hamilton forma- 

 tion and probably in its lower half. The fossils are: 



