438 The Upper Devonian Deposits of Maryland 



The Catskill Formation 



The Catskill formation of ^Marvlaiid is nearly barren, no fossils other 

 than underterminable vegetable fragments and a few poorly preserved 

 pelecypods having been found in it. It closely resembles the Catskill of 

 New York in its lithological character, in the absence of marine fossils, 

 and in its increasing thickness eastward, where it replaces the upper 

 Chemung sediments. 



The similarity in lithological character, conditions of sedimentation, 

 geographical distribution, and its continuity with the Catskill of Penn- 

 sylvania and New York fully justify its correlation with them. 



The range of the fossils of the Upper Devonian of Maryland is given 

 in the subjoined table which also shows their occurrence in the Ithaca 

 fauna at Catawissa, Pa.,' and in the Upper Devonian of central New 

 York." The range of the species in Maryland is also shown in greater 

 detail upon the chart of columnar sections (contained in pocket) in which 

 the species are indicated bv the numerals prefixed to their names in the 

 table. 



• Kindle and Williams, Bull. U. S. Geol. Survey, No. 244, 1905, p. 78. 



' The occurrence of species in the Liorhynchus glohuliforvie zone and in 

 the Ithaca of Central N. Y. cited in columns referred to Williams, is from 

 Folio of the U. S. Geol. Survey, No. 169, 1909, p. 6. The occurrence in Ithaca 

 fauna of Central N. Y. cited in column referred to Clarke is from Bull., N. Y. 

 State Museum, No. 82, 1905, p. 55. 



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