Marylaxd Geological Survey 433 



disjunctus fauna has not been noted in a corresponding position in any of 

 the studied sections, where the stratigraphic relations are clear. These 

 facts suggest a possible lower range of Spirifer disjunctus in the western 

 sections of Maryland analogous to the lower range of that species in 

 eastern New York described by Clarke. 



The middle shale and sandstone beds occupy a position similar to that 

 of the Wellsburg member of the Chemung of Xew York, which they also 

 resemble in being more arenaceous than the underlying strata in the 

 eastern and central sections, and in containing fewer fossils. They are, 

 however, more fossiliferous in the Oakland area (15 species having been 

 observed in this division east of the Oakland area 3 of which are new). 

 All but one of the previously described species occur in the Wellsburg 

 member in Xew York. Most of these species have a considerable strati- 

 grai^hic range so that they have little value for exact correlation and the 

 equivalency of these horizons is not necessarily established. 



The upper conglomerate occupies a position suggesting that of the con- 

 glomerate terminating the Wellsburg member in New York. It is, how- 

 ever, not possible to correlate them by faunal features and their identity 

 is not established. 



The upper shale and sandstone beds are replaced by Catskill sediments 

 in central and eastern New York so that it is not possible to institute com- 

 parison between the upper shale and sandstone bed and the strata of that 

 region. Aihyris angelica occurs near the top of the Jennings in ]\larvland 

 and is also found in New York in the Cuba sandstone and overlying beds 

 of the Olean quadrangle* in western New York where it appears to be 

 high in tlie Chemung. Species of Palceanatina also occur in the fer- 

 i-uginous u])per beds of the Ciienuuig in New York as in Mai7land. 



The following table shows the relation of the marine Upper Devonian 

 strata of eastern Allegany County, [Maryland, to those of central New 

 York. 



■ BulL of the N. Y. State Museum, No. 69, 1903, p. 992. 



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