' 22 NEW YORK STATE MUSEUM 



dack region into the edge of the Appalachian plateau south of the 

 Mohawk river. It does not, however, include any uplands belonging 

 to the Helderberg or Catskill regions, although these are near at 

 hand and conspicuously viewed from the southern boundary of the 

 area. The principal drainage of the area is through the Mohawk 

 river, with several of its affluents, principally the Schoharie, while 

 ^ the Sacandaga controls the drainage of a part of the northern border. 



The northern limit is nearly marked by the village of Northville, 

 while Duanesburg and Esperance villages are close to the southern 

 border. On the west the area extends just beyond the Big Nose 

 or west of Yosts Station. 

 ' Glacial lobes. Perhaps the most salient features brought out by 



I the investigation of the territory are two glacial lobes, one a part 



j of the great Mohawk glacier, which is now demonstrated to have 



j moved westwardly for a short distance up the Mohawk valley and 



I what may be called a Sacandaga glacier^ moving southerly about 



I the region of Northville, swinging toward the southwest in the 



neighborhood of Mayfield, filling into affluent westward flow with 

 the Mohawk glacier about Gloversville. The existence of such a 

 westward Mohawk flow was postulated by Chamberlin on the evi- 

 dence which was at hand many years ago. Further advent of this 

 westward movement has been given by Professor Brigham. 



Conspicuous evidence of this movement is found in the glacial 



striae which are well distributed throughout nearly the entire area. 



About 60 localities of such striae have been found and recorded. 



j The direction is not on the average greatly variant from westward, 



i but north and south of the Mohawk river in the neighborhood of 



the Big Nose there are interesting divergences. On the north of 



! the river to the west-north^yest and on the south of the river toward 



, the west-southwest, illustrating the axiradiant flow of Chamberlin, 



a still more interesting and somewhat puzzling divergence is found 



I in the neighborhood of Galway village west and northward where 



some of the striae point distinctly toward the northwest and 



even branch toward the north-northwest. As the glacier apparently 



came around into the ]\Iohawk valley from the Hudson-Champlain 



\ depression, this seems a curious condition. What possible effects, 



if any, of local glaciation in the Berkshires and Catskills may have 



produced results here, remain to be determined. It may be asked 



I whether this postulated western flow might not have been a flow to 



the eastward as the striae themselves do not ordinarily give special 



S evidence as to whether the flow was in one direction or the other, 



1 



