J. J. Stevenson — Use of the Name " Catskill" 333 



Holoptychius beds of Tioga County, Penn., as Catskill, where- 

 as they lie but little above the Lower Chemung Conglomerate 

 (Allegrippus of White), which, in Susquehanna County of 

 Pennsylvania is at 1000 feet below the Montrose sandstone 

 (Honesdale Sandstone of White), while in south central Penn- 

 sylvania along the easterly outcrop, the bed is fully 2000 feet 

 below the Montrose sandstone. And the use of this lithologic 

 test has been the cause of confusion and annoyance ever since. 



The objections to the use of the name Catskill for the whole 

 series are so strong as to render it certainly unwise if not alto- 

 gether wrong; and they apply equally to the proposed disuse 

 of the term to distinguish a subordinate formation. 



That the Catskill Mountain region is not the typical area of 

 the Catskill Group has been mentioned. It was there that 

 Mather* found his " Catskill Mountain Series," which included 

 all the rocks of the Catskill region from the Lower Carbon- 

 iferous Sandstone of H. D Rogers down to the bottom of the 

 Marcellus, so that .it comprehended the Hamilton, Chemung 

 and Catskill as well as part of the Pocono. Vanuxemf used 

 the term " Catskill Group " in his final report to designate the 

 summit rocks of the Devonian, the group to which he had 

 given the name of Montrose sandstone in the fourth annual 

 report.;); The distribution of the group as given in the final 

 report differs little from that given in the annual report, but 

 in the former the Oneonta sandstone is taken as the equivalent 

 of the Montrose sandstone. The series was taken to be the 

 same with the Old Red Sandstone of Prof. Hall§ which rests 

 in the Chemung Group. 



In spite of Yanuxem's error in the final report, that of 

 identifying the Oneonta with the Montrose sandstone, it is 

 doubtful whether any geological term has ever been applied to 

 a better defined group than that made by Yanuxem in the 

 fourth annual report, to which he gave the name of Catskill in 

 his final report. The Montrose sandstone is a thoroughly well 

 marked horizon, obscure only in the exceedingly restricted 

 area of southern Xew York: it is traceable without difficulty 

 in the sections along the eastern outcrop from northeastern 

 Pennsylvania to many miles beyond New River in Yirginia. 

 Its variations in northern Pennsylvania westward are well 

 shown in the sections obtained by I. C. White and in southern 

 Pennsylvania westward in the sections obtained by Stevenson. 



The Catskill of Yanuxem is distinct also in its history ; its 

 distribution is very different from that of the Chemung ; it is 



* Mather, Assembly Doc. No. 150. 1841, pp 77-82. 

 f Yanuxem, Geology of New York, Part III, 1842, p. 12. 

 % Vanuxem, Assembly Doc., No. 50. 1840, p. 381. 

 JJHall, Assembly Doc, No. 50, 1840, p. 452. 



