THE LATJKENTIAN ICE-BODY 651 



cut through by the Turpee Brook. 55 Far up Styles Brook there are a 

 series of them, greatly modified by present stream work. These are given 

 only as examples, as many more have been seen and others will undoubt- 

 edly be discovered as future work is undertaken. 



Possible local moraines. — Lateral moraines, sometimes of rather per- 

 plexing character, are encountered in the brook valleys. In the Slide 

 Brook Valley, in the center of the Mount Marcy sheet, and in some other 

 of the brook valleys, occur apparently morainal ridges on either wall of 

 the valley that are very like lateral moraines of local glaciers. It is 

 possible, however, that these are remnants of bisected crescent-shaped 

 recessional moraines, either of local glaciers (and therefore convex down- 

 stream) or of the main ice-body (convex upstream), the present streams 

 having destroyed their original form. Two miles north of Keene coarse 

 material, which some observers have considered as moraine, overlies strati- 

 fied sand. These instances are mentioned as having a possible bearing on 

 the problem of local glaciation in the Aclirondacks. 9 The studies of J, L. 

 Rich in the Catskill Mountains suggest that local glaciers prevailed there 

 as well. 10 



Eslcers. — Eskers are very uncommon. A long, narrow ridge of gravel 

 and coarse sand was found in the Johns Brook Valley that was believed 

 to be one. A very perplexing ridge with the appearance of an "eskerette" 

 is responsible for the existence of Clear Pond, near the center of the 

 Ausable quadrangle. Others will, undoubtedly, be found when more 

 thoroughly sought. 



Karnes. — Karnes are likewise rather rare. In the vicinity of the south- 

 western end of the Middle Kiln fault pass a number of irregular hills 

 are strongly suggestive of this class of moraine. 



Outwash plains. — Outwash plains can generally be distinguished from 

 deltas and glacial lake bottoms by ice-block kettle-holes. Frequently, in 

 the field, such distinctions are difficult, if not impossible, to make unless 

 accompanied by other positive evidence. Such is the problem that is met 

 in the South Meadows country, in the northern portion of the Mount 

 Marcy sheet. Several kettle-holes dimple the somewhat level surface of 

 this great sand plain. A possible correlating outlet channel, described 

 later on, would incline the writer to regard it as a glacial lake bottom. 

 Our present knowledge is not conclusive, and a difference of opinion 

 exists among several geologists, whose experience has led them to take 

 opposing views on the matter. 



8 J. F. Kemp : N. Y. State Mus. Bull., No. 138, p. 19. 



9 I. H. Ogilvie : Jour. Geol., vol. 10, 1902, p. 405. 



10 J. L. Rich : Am. Jour. Sci., vol. xxxix, Feb., 1915, p. 154. 



XLVII — Bull. Geol. Soc. Am., Vol. 27, 1915 



