618 H. L. FAIECHILD POST-GLACIAL UPLIFT OF XEW EXGLAND 



sheets. Tlie village lies in the valley eroded out of the delta, which 

 spreads mainly to the southwest, where it forms an extended gravel plain 

 with elevation 340 to 350 feet. An area of kettles with sharp relief 

 includes the Green and Great ponds. "West of the village the delta has 

 altitude by the map of 360 feet, with its back slope rising to 3T0 feet, 

 above which is a kame area at over tLOO feet. East of the village a dis- 

 tributary channel heads on the plain at about 365 feet and lies along the 

 south side of the delta, against the rock wall. A remnant of the delta 

 by the railroad station is 340 feet, using the Fitchl3urg Eailroad as 

 290 feet. 



Passing east^-ard up the valley of Millers Eiver, remnants of the 

 aggraded delta which once filled the narrow gorge are occasionally seen, 

 rising to about 390 feet at Farley, where a good plain marks the delta 

 head. Above Farley only glacial g'ravels are seen. 



The estuary plains south of Millers Falls may be seen in Emerson's 

 maps, and the standing water summit will closely agree with our map, 

 figure 2. 



In Connecticut. — Xo thorough examination has been made of the en- 

 tire valley in Connecticut, but in addition to former observations two 

 critical districts have been recently studied. One is the east wall of the 

 valley in the Hartford district, shown in the Tolland sheet. The Hocka- 

 nuni Eiver is the principal stream, and its delta is found at Eockville, 

 with altitude about 2 TO feet, which is almost the height of the marine 

 summit. The estuary shore is quite distinct. 



The other district is the Farmington-Quinnipiac Valley. This inter- 

 esting valley, which carries a middle stretch of the Farmington Eiver 

 and the lower Pequabuck and the upper Quinnipiac rivers, was flooded 

 by a branch of the Connecticut estuary. The uplifted marine plane 

 rises from 225 feet at Plantsville to 240 feet at Bristol and 250 feet at 

 Farmington (Meriden sheet), but the floor of the valley has slight differ- 

 ence in level, and the singular northward turn of the Farmington Eiver 

 at Farmington and of the Pequabuck at Plainville requires explanation. 

 The present divide between the Pequabuck, flowing north to the Farm- 

 ington, and the Quinnipiac. flowing southward, is at Plainville, on a 

 smooth gTavel plain with altitude 180 feet. The Pre-Glacial drainage 

 of all the valley was southward (see Manual of the Geology of Connec- 

 ticut, Bulletin Xo. 6. Connecticut Geological Survey). The explanation 

 of the present anomalous flow appears to be found in diversion by the 

 delta filling built in the marine estuary. The sweep of the earlier river 

 currents during the marine flood was southward, and the earliest and 



