i86 M. L. FULLER 



-EARLIER OR STOUGHTON STAGES. 



Raithsnahe Hill lakelet. — ^This is the smallest of the recognized 

 lakelets of the Stoughton Bay area, being less than half a mile in 

 length and onlv about one-eighth of a mile in width. It was formed 

 in a re-entrant just north of the col between Rattlesnake Hill, rising 

 to 420 feet on the northwest, and another granitic hill, about 360 feet 

 in height, on the southeast. The rock-floor of the col is not now 

 exposed, but as there was free drainage to the south, the deposits 

 though constituting a somewhat broad and flat sheet, are probably 

 of shght tliickiiess at tlie crest. The surface of these deposits stands 

 at 250 A. T. 



The deposits of the localit}^ may be divided into three classes: 

 (i) the outwash deposits in the channel leaduig southward from the 



Fig. 2 . — Diagraiirmatic north-south section througli Rattlesnake HiU divide, sliow- 

 ing outlet and broken delta deposits. (A, B, etc., shovr successive stages of ice-front 

 during its recession.) 



col; (2) the flat top deposits at and just north of the crest; and (3) 

 the irregular and broken delta deposits on the north (Fig. 2). 



The outwash gravels, which constitute a gentle sloping deposit 

 extending down the valley to the southward, were evidently formed 

 not later than the period when the ice-margin rested at the point 

 represented b3"^4, as the ■Lmfilled kettles and other depressions between 

 the imperfect deltas to the north indicate that in the later stages httle 

 or no material was being carried into tlie lakelet. 



The deposits at and just north of the crest consist of sands and 

 fine gravels, and evidently represent the perfected lake deposits. 

 They present an almost perfectly flat surface, one-eighth of a mile in 

 width, and perhaps twice as long, which is so ill drained that in the 

 wetter seasons the water stands over several acres, though of a depth 

 of oifly a few inches. It is now the site of a cranberr}^ bog. From 

 this flat the rock hills rise with a sharp Ime of demarkation abruptly 

 on each side. 



