SOME GLACIAL WASH-PLAINS. 93 



northwards in the form of an interlobate moraine to and 

 beyond Plymouth (17, 53). The Buzzard's Bay moraine 

 caps the Elizabeth Islands and is then lost at sea, but 

 probably appears westward in the C'harlestown moraine 

 skirting the southern coast of Rhode Island. 



A broad plain (6-12) skirts the southern side of the 

 moraine on Cape Cod, combining features which have been 

 described on Martha's Vineyard and Nantucket, with the 

 addition of numerous lakelets and kettle-holes which here 

 take the place of the fosse on Nantucket. 



Traces of what appears to be an earlier, temporary halt 

 of the ice-sheet with deposition of small plains are shown 

 along the southern coast of Barnstable (9) in situations 

 which have not been suffused by the outwash of sands and 

 gravels from the principal moraine. Two such deposits 

 are shown on the annexed map of the Great Pond area 

 in Barnstable (fig. 4). 



A diagnosis of this plain in comparison with those of 

 Nantucket and Martha's Vineyard is interesting in show- 

 ing the irregularit}^ of the melting of ice along the front 

 and in the determination of the place in which the mo- 

 rainal wall proper was built. 



The annexed map of the Great Pond region in Barn- 

 stable shows by the contours of the plain, as the author 

 has been able to ascertain on the ground, that the ice-sheet 

 probably overlay the morainal wall and lay in the lake 

 area as late as the closing stage of sand-plain construc- 

 tion. The high terrace skirting the eastern border of the 

 pond shows a marked slope away from the pit with a 

 maximum point, the apex of the alluvial cone, designated 

 by the eighty feet contour at the northeast corner of 

 the pond. An examination of the map will show the 

 reader that the plain slopes away southeastward, south- 

 ward and southwestward from the respective sides of the 

 ice-block hole. The association of the later local fans, 



