606 H. L. FAIECHILD POST-GLACIAL UPLIFT OF NEW ENGLAND 



the aggraded delta. This difficulty will not often occur in the area 

 described. 



With the lack of the two elements above noted, there may yet be some 

 variation of the delta surface from the theoretic marine plane, due to 

 differences in the construction of the deposit, whether above or beneatli 

 the water surface, and to the various sources of possible error, already 

 noted. 



Deltas laid in narrow and steep-walled valleys are subject to great 

 erosion and possible obliteration of the critical plane; but this is not 

 likely to occur in our area. 



Following is a tabulation of a few of the observed summit deltas on 

 the larger streams. Some description of them is given in the later 

 chapter on areal description. 



No examination has been made of the many small streams and wet- 

 weather runs pouring southward from the uplands into the high-level 

 waters. These will surely record the summit marine level, and witJi 

 greater precision than the aggraded deltas of the larger rivers. If the 

 topographic maps had the accuracy and "expression" of the latest sheets, 

 the location of many summit deltas could be fairly predicted. An 

 example is found on the Kent sheet, southeast corner, where the contour 

 lines suggest marine summit planes at about 220 to 200 feet. 



Deltas recording the Summit Marine Level 



River. 



Locality. 



Topogfraphic 

 sheet. 



Elevation 



(feet). 



Marine 

 summit 

 (feet). 



Millers 



2[assachusetts 

 Millers Falls ... 



North Nashua 

 Monoosnoc . . . 

 Blackstone • . . 

 West 



^mi ... 

 Nashua 



Five-Mile 



Quinebaug 



Moosup 



Nachaug 



Willimantic, Hop . 



Hockanum 



Paquabuck .... 

 Quinnipiac .... 



Fitchburg 



Leominster : 



Sajundersville 



Northwest of West 



Upton 

 West of Milf ord .... 

 Clinton 



Warwick-Green- 

 field. 

 Fitchburg . . . . 

 Fitchburg . . . . 

 Blackstone . . . 

 Blackstone . . . 



Blackstone . . . 

 Marlboro 



Connecticut 



Danielson-Dayville 



Putnam 



Moosup 



Willimantic , 



Willimantic 



Rockville 



Bristol 



riainville 



Putnam 



Putnam 



Moosup 



Norwick 



Norwich-Gilead 



Tolland 



Meriden 



Meriden 



3G0-H7O 



390^00 



380 



320-330 



300-330 



300-320 

 340-380 



240-260 

 280 

 240 



2.50-255 

 260 



260^270 

 240 

 240 



38.") 



395 



320 



320 

 S75 



265 

 285 

 255 

 2.55 

 260 

 275 

 240 

 240 



