GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 283 



Feet Total 



measurement of Ashburuer^ from the L>elaware 

 and Hudson Railroad station to the base of the 

 Rondont Avaterlime belong in the Lorraine beds. 

 This thickness, added to the 2(SS0 feet of shales 

 and thin sandstones passed through in the Alta- 

 mont well before reaching the top of the Trenton 

 limestone, gives a thickness of 3475 feet for the 

 Lorraine and Utica formations at this locality. 

 Along the small brook in which the gas well is 

 located there are exposures of the Lorraine beds, 

 consisting of bluish to grayish argillaceous shales, 

 with an occasional sandstone stratum; but the 

 upper part of the zone is covered around the slope 

 of High Point 646-646 



About d^ miles southwest of Altamont, on the road from Alta- 

 mont to Knox, is a conspicuous ledge of the Pentamerus [Coey- 

 mans] limestone ... to the east of the road, which at this 

 locality is very fossiliferous, and the weathering and fires have 

 so decomposed parts of the massive cliff that it makes an excel- 

 lent place for collecting. Along the road from Altamont there 

 are alternating exposures of sandstones and shales, sandstones 

 predominating, with a thickness of 635 feet by the barometer 

 without allowing for the dip, which would increase the amount; 

 then 210 feet are covered when this Pentamerus [Coeymans] 

 ledge is reached, 845 feet higher than Altamont. It is not clear 

 whether the base of the Pentamerus [Coeymans] is shown or not, 

 but the Tentaculite [Manlius] is covered, and only 30 feet of the 

 Pentamerus [Coeymans] is exposed. The following species were 

 collected at this place. 



1 Sieberella galeata (Dal.) H. <& C. aa 



2 Atrypa reticularis {Lin.) Dal. a 



3 Strophonella pimctulifera (Con.) Hall c " 



4 Stropheodonta varistriata (Con.) Hall v 

 .5 Spirifer perlamellosus Hall r 



6 Unciniilus miitabilis (Hall) H. & C. r 



7 U. pyramidatus (Hall) H. cC- C. rr 



21 Indian Ladder section 



Prosser 



Near the northern end of the Helderberg mountains, about 

 south of Meadowdale, on the Susquehanna division of the Dela- 

 ware and Hudson railroad, is the highway known as the Indian 



^Tlie railroad station (formerly Knowersville) is 459 feet A. T., and 

 Ashburner gave the altitude of the gas well's mouth as 510 A. T., and the 

 base of the LoAver Helderberg limestones as 595 feet vertically above the 

 mouth of the well [Am. Inst. Min. Eng. Trans. 16:951]. 



