182 The Lower Devoxian Deposits of Maryland 



Helderbero Formation 

 New Scotland Member 



Cherty limestone. 



In a cut on the Georges Creek and Cumberland Eailroad, just east of 

 Winchester Eoad Station, the black chert beds of the Shriver Chert mem- 

 ber of the Oriskany are exposed. The chief features of this exposure are 

 the weathered condition in which the chert is found and the ease with 

 which the fossils may be obtained from it. It is the best locality for Lower 

 Oriskany fossils in this region. The chert is found at the east end of the 

 cut, weathered into arenaceous beds which are highly colored, alternating 

 in thin bands of various shades of brownish-red and pink. It is said that 

 when the cut was first made these colors appeared on the surface. Now 

 one generally has to break a fresh surface to see them. Not a great deal of 

 the section is shown here and the fossils are best obtained from the loose 

 blocks in the cut. 



The fauna consists of: Pholidops tumida (aa), Chonetes hudsonius 

 (aa), Anoplia nudeata (r), Beachia suessana var. immatura (r), Spirifer 

 trib^dis (a), 8. trihularius (r), Anoplotheca fiahellites (aa), Meristella 

 lentijormis (rr), Tentaculites acus (rr), T. elongatus (rr), Plaiijceras 

 small species, ostracods and a fish spine. 



A few yards to the west of the exposure of the Helderberg at Cash 

 Valley near Cumberland the black chert of the Shriver Chert member is 

 taken out for road metal. It is weathered to a yellowish or brownish 

 mixture of clay and sand. This is one of the best places to secure the 

 fossils of this member, but the specimens and species are few in number. 

 They include: Pholidops multilamdlosa, Chonetes hwdsonicus, Beachia 

 suessana var. immatura, Spirifer paucicostatus, S. tribidis, S. trihuarius, 

 Anoplotheca fiahellites (c), and Tentaculites acus. 



III. Section at Devil's Backbone 

 The remarkable section of the Helderberg at the Devil's Backbone has 

 been described on preceding pages. An excellent exposure of the Oriskany 

 is also to be seen at this place. The section is as follows, according to the 

 measurements of Schuchert: 



