Maryland Geological Survey 167 



treated according to their geographic occurrence beginning with tlie 

 westernmost exposures in tlie Cumberland area and proceeding thence 

 eastward. 



I. Section at Keyser, West Virginia 

 An excellent exposure of the entire Helderberg is seen in the quarry of 

 the Standard Lime and Stone Company, east of Keyser, West Virginia. 

 The following section' is continuous with the beds of the Keyser member 

 described on a preceding page. 



Oriskaxy Formatiox 



Vertical 



Shriver Chert Member ^''^pet"''' 



Siliceous shale containing numerous chert nodules. 



Helderi'.erg Formation 

 New Scotland Member 



Fissile drab shale 14.0 



Gray limestone and interbedded white chert. The chert is in layers 

 6 to 9 inches thick and forms almost the entire unit. 4.6 feet and 3.6 feet 

 above the base of the unit occurs Spirifer macropleurus, at 1.6 feet Meri- 



Stella arcuata 21.5 



Medium-bedded gray limestone with some chert layers. 4.5 feet above 

 the base of the unit occur Phacops logani, Dalmanella perelegans, Schu- 



chertella woolivorthana. Spirifer macropleurus 5.1 



Shale much weathered 0.2 



Black speckled crinoidal limestone, rather coarse grained with one 

 chert layer 1.1 



Thickness of New Scotland member 41.9 



Coeymans Member 

 Thin-bedded gray crinoidal limestone, with one chert band. At middle 



of unit occurs Strophonella leavenworthana 2.5 



Shaly limestone, with a chert layer 1.0 



Shale weathered to clay 0.5 



Massive gray crinoidal bed with one 6-inch bed of chert 3.5 



Massive gray crystalline limestone. Between 2 and 2.7 feet above base 



of unit are a number of bands of sand which weather out as brown ridges. 



At base of the unit occur Atrypa reticularis, Gypidula coeymanensis (a), 



Schuchertella woolworthana, Stropheodonta sp., Lioclema subramosum. . 6.8 



Thickness of Coeymans member 14.3 



' Measured by C. K. Swartz, assisted by J. B. Reeside, Jr. 



