Maryland Geological Survey 133 



The species not restricted to Maryland have the following range in the 

 formations of New York : 



No. 



Coeymans 2 



New Scotland 19 



Becraft G 



Lower Oriskany 27 



Upper Oriskany 31 



This member closely resembles the tyj^ical Oriskany of New York in 

 its lithology and its fauna. The f aunal relations are shown not only by the 

 large number of species common to both, but also by the occurrence of 

 Spirifer arenosus, the guide fossil of the Oriskany, in profusion associated 

 with many other species diagnostic of that formation, including Spirifer 

 murchisoni, and various members of the genera Renssel^ria and Ealonia. 

 The presence of many species of the Lower Oriskany of New York is also 

 to be noted. The restriction of so large a number of species to Maryland 

 is due to the fact that a longer time is represented here than in New York. 



GrEOLOGICAL AND GeOGIUPIIICAL DISTRIBUTION OF SpECIES.* 



The geological and geographical distribution of the species obtained 

 from the Maryland Lower Devonian has already been partly indicated 

 in the discussion of the various zones. A more complete presentation of 

 the occurrence of these forms is shown in the following tables as well as 

 in the chapters on correlation and on the systematic paleontology : 



' Contributed by C. K. Swartz. 



