Maryland Geological Survey 179 



In the quarry and on the talus slopes above are blocks of chert with 

 Oriskany fossils, large blocks of conglomeratic sandstone that must have 

 come from the top of the Oriskany, and some boulders of limestone with 

 Oriskany fossils. 



There is scarcely room for more than 25 feet of Oriskany here. None is 

 seen in place and the Komney shale occurs in such proximity that the 

 Oriskany cannot be very thick. 



X. Section at Cherry Run, West Yirginia 

 A much greater section of the Lower Devonian is exposed on the south 

 side of the river on the Baltimore and Ohio Eailroad about f of a mile 

 west of Cherry Eun. Here the river and railroad have both tended to 

 strip the rocks of their covering. Tlie most conspicuous part of this sec- 

 tion is its lower member which forms a cliff 40 to 60 feet high, directly 

 along the railroad track. The fossils are not plentiful and are difficult 

 to obtain. The following section was measured by Charles Schuchert. 



Oriskany FOUMATION thickness vertical 



feet thicliiiess 



Light gray limestone. Spirifer arenosus (c), S. murcMsoni 

 (aa.) , Anoplotheca flabellites (aa) , Rensselwria marylandica (r) 10.0 160.0 



Hexdebberg Formation 

 Becraft Memier 

 Dark blue arenaceous limestone with lumps of black chert. 

 The fauna is most abundant in the upper half. Rensselwria 

 subglobosa, Anoplotheca flabellites, Spirifer cyclopterus, S. 

 concinnus, Cyrtina rostrata, Eatonia medialis, E. peculiaris (r), 

 Unciniilus vellicatus, Rhipidomella assimilis 85.0 150.0 



Thickness of Becraft member 85.0 



New Scotland Memhcr 

 Gray heavy bedded limestone with chert. Mostly covered ... . 50.0 65.0 



Light gray cherty limestone. Spirifer macropleurus (aa), 

 S. cyclopterus (aa), S. perlamellosus (a), Trematospira equi- 

 striata (rr), Anoplotheca concava (r), A. flabellites (r), Rhi- 

 pidomella oblata (r), Dalmanclla perelegans (r), D. eminens 

 (r), Streptelasma (?), Atrypina imbricata (rr), Eatonia singu- 

 laris (?), Leptana rhomboidalis (r), Uncinulus vellicatus (c), 

 Camarotcechia altiplicata (r) 15.0 .... 



Thickness of New Scotland member exposed 65.0 



