648 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



On French Creek there is an extensive plain of sandy gravel, leading 

 from the moraine near 8aegerstown southward, and extending beyond 

 Meadville. It is only 15 to 20 feet above the level of the creek, and conse- 

 quently is much below the level of the drift deposits of the outer moraine, 

 where it passes through them near Cochranton. This does not make a 

 clear connection with the moraine at Saegerstown, and may simply represent 

 a ^postglacial flood plain of French Creek. 



On Conneaut Creek, above Edinboro, there is an extensive plain but 

 little above the level of the stream, which heads abruptly at the inner 

 member of this morainic belt near McLane. Being low and swampy it 

 afl"ords no exposures showing its structure, but its surface is gravelly. 



On Le Boeuf Creek, at Waterford, this inner member connects with a 

 terrace which leads down the creek. There are many small basins in the 

 terrace at its head, and Lake Le Boeuf occupies a large one, nearly a square 

 mile in extent. 



Lake Pleasant Valley was not examined below the lake Whether or 

 not the inner meinber has a terrace here has not been ascertained. On 

 North French Creek, the next vallej^ to the east, this member has a terrace 

 which heads a mile or more north of Lowville in the moraine, and has there 

 many pits or small basins, some of which have abrupt, wall-like margins. 

 This terrace follows the stream southward to French Creek, at Wattsburg, 

 maintaining a height of 20 feet or more above its present flood plain. The 

 outer member, which passes south of Wattsburg, has a moraine-headed 

 terrace leading south through Beaver Dam. It stands 15 to 20 feet above 

 the present flood plain of the small stream that traverses this valle}-. 



In southwestern New York the outer member has a gravel plain in a 

 valley southwest of Clymers, which connects French Creek with Big 

 Brokenstraw, and one heading in another valle}', near Panama station, also 

 connects French Creek with Big Brokenstraw. In neither place is the 

 gravel plain much above the level of the present flood plains of the small 

 streams which occnp)' the valleys. The inner member has a glacial outlet 

 into French Creek "\^alle}' from Findley Lake, the lake now occupying a 

 portion of this outlet. 



Along the outlet of Lake Chautauqua there is a pitted gravel plain 

 outside the moraine, remnants of which are conspicuous in the viciuit}' of 

 Falconer. Its height is onl}' 50 to 60 feet above the outlet, or scarcely 



