330 J. J. Stevenson — Use of the Name "CatskillP 



while the eastern border was all the time gaining in ice, or 

 was making only a short retreat. 



The actual facts correspond with these views. The distance 

 in the Upper Mississippi basin between the farthest southern 

 limit of the ice and the line of the great moraine, or that of 

 the so called "second Glacial epoch," is over 500 miles ; but to 

 the eastward it narrows through Indiana, Ohio, Pennsylvania 

 and New Jersey ; and in New England a corresponding moraine 

 interval cannot be certainly made out, and nothing exists that 

 could not be better explained by reference to short retreats in 

 a single glacier. 



I leave the subject here for the consideration of geologists of 

 the east and west. The cause appealed to explains at least 

 why the geologists of the east and west are divided on the 

 subject ; and, also, why the grand display of terminal and re- 

 treat moraines characterizing the west, produces there the 

 stronger opinions and the stronger expressions of opinions ; 

 and why also a complete survey of the facts will probably lead 

 to a general agreement in favor of a single Glacial epoch only. 



Art. XLVIL— On the Use of the Name "Catskill"; by 

 John J. Stevenson. 



Two years ago, the writer* urged that the series of beds 

 included within the Catskill and Chemung periods, should be 

 rouped into one period, the Chemung, with three epochs, the 

 ortage, the Chemung and the Catskill. Since that time 

 Prof. Hallf has presented in detail the results of his later 

 studies in the Catskill region, and Mr. 1ST. H. Darton^: has pub- 

 lished a brief synopsis of work done by him for Prof. Hall 

 in the same region. These papers supplement and confirm the 

 previous notices of work done by Prof. Hall, as given by him§ 

 from time to time in his official reports and elsewhere. In 

 closing his paper, Mr. Darton suggests that " Catskill " be 

 applied to the Upper Devonian as the name for the whole 



* Stevenson, The Chemung and Catskill (Upper Devonian) on the eastern side 

 of the Appalachian basin. Vice-President's address before Amer. Assoc. Adv. 

 Sci., vol. xl. 



f Hall, Bulletin Geol. Soc. of Amer., vol. iv, p. 8. Unfortunately only a refer- 

 ence to the paper is given with a brief statement respecting the discussion. The 

 paper has not been published. 



% This Journal, vol. xlv, 203-209. 



§ Hall, 28th Ann. Rep. of Regents on the State Museum, 1876, p. 15; Science, 

 1880, p. 290 ; Fifth Ann. Rep. of State Geologist, Assembly Doc. No. 105, 1886, 

 p. 11. In this last the true relation of the Oneonta sandstone to the underlying 

 Hamilton and the overlying Chemung was stated and illustrated by a section. 



