356 FRANK BURSLEY TAYLOR 



eastern one turns off to the east and is soon lost on the hill above 

 Salmon creek, while the western one follows the bench to Sharon 

 as described. 



The relations here are highly significant and afford a strong 

 basis of correlation around the two sides of Mount Washington; 

 for evidently the large river, which seems to start so abruptly 

 where the two moraines diverge, came from the northwest along 

 a crease or depression in the ice. The ice-sheet advancing down 

 the Copake valley on the west side of Mount Washington pressed 

 eastward over the relatively low ground north of Sharon and 

 west of Lakeville, and met the ice coming down the Housatonic 

 valley on the east side of the mountain. A moraine along the 

 southeast flank of Mount Washington north of Lakeville appears 

 to belong to this same halt and indicates that a large portion, 

 probably nearly one-half of the mountain, remained at that time 

 uncovered as a nunatak. All of the drainage of the nunatak 

 and of as much of the adjacent ice-field as sloped toward it found 

 its way of escape along the crease between the two lobes and 

 thence down the old river bed past Sharon. Since the ice 

 has disappeared, the bed of the river in the ice-crease has gone, 

 and no trace of it remains. This is why we find the river bed 

 appearing suddenly where it emerged from the crease. 



The significant fact which this relation establishes is this, viz., 

 that the two moraines which diverge from the crease belong to 

 the ice-border of one and the same halt. This enables us to say 

 that if the Sharon moraine is No. 3, in a series numbered down 

 from Hillsdale, then the east moraine at the crease is the same 

 number counting down the Housatonic from Van Deusenville. 

 Part of the latter series is not so strong as that between Sharon 

 and Hillsdale, for the moraines in the Housatonic valley are 

 mostly faint and weak. Still, well-developed small fragments 

 may be seen at Salisbury for No. 4, west of Chapinville for No. 5, 

 near Ashley Falls for No. 6, and on the mountain flank south- 

 east of Great Barrington for No. 7. It would be hard to think 

 of a more beautiful correlation between two series than that 

 which is furnished by the peculiar relations of the Sharon glacial 

 river. 



