122 The Lower Devonian Deposits of Maryland 



after a station on the West Shore Railway not far from Kingston. Sub- 

 sequently Grabau ' discovered that the greater part of the original Kings- 

 ton consisted of the Helderberg series repeated by overthrust faulting, and 

 terminated by an " impure schistose limestone " more than 100 feet thick, 

 having a Lower Oriskany fauna like that of Becraf t Mountain, jSTew York. 

 The fauna of the Lower Oriskany was described by Clarke.^ 



The following table shows the relations of the fauna of the Shriver Chert 

 member to the Helderberg and Oriskany of New York and Maryland : 



No. 



Species previously described 12 



New species 17 



Total 29 



The range of the previously described species in other formations is as 

 follows : 



No. 



New Scotland of New York 4 



Becraft of New York 7 



Lower Oriskany of New York 11 



Upper Oriskany of New York 5 



Ridgely sandstone member of Oriskany of Maryland 10 



The Lower Oriskany age of these beds is shown by the above table. 

 The Shriver Chert resembles the Camden Chert of Tennessee litho- 

 logically. The faunal resemblance is but slight.' 



Ridgely Sandstone Mernber 



The Eidgely sandstone member contains a fauna rich in species and 

 individuals. The following table shows their range: 



No. 



Species restricted to Maryland 54 



Species occurring elsewhere 66 



Total 120 



^ N. Y. State Mus., Bull. No. 49, 1903, p. 1063. See also Van Ingen and Clarke 

 ibidem^, pp. 1193-1197; Shimer, N. Y. State Mus. No. 80, 1905, p. 184. 

 ^N. Y. State Mus., Mem. No. 3, 1900. 

 ° See Schuchert, Amer. Jour. Sci., vol. vii, 1889, p. 184. 



