610 H. L. lAIRCHILD POST-GLACIAL UPLIFT OF NEW EXGLAXD 



as the surface slope. The ice contact of the original construction mav 

 not be wholly destroyed^ or the kettles and irregularities of the deposit 

 may partly persist, especially on protected sides, as in the case of the 

 Xewtonville plain. The drifting of the wave-swept material might pile 

 slanting beds at the margin of the plain, which could perhaps be mis- 

 taken for foreset or backset delta structure. Sometimes remnants of the 

 original masses might remain, like the knolls in the Xewtonville plain. 



Equivocal structures and misinterpretation of the plains is more likely 

 in the case of the coarser deposits and at the higher levels. The great 

 number of fine sand or silt plains on the low ground of Massachusetts 

 and Ehode Island could not be regarded as constructional at water level. 



The conspicuous evidences of wave-leveling are so common over mosc 

 of the submerged territory that it seems almost superfluous to present 

 any list of localities. However, the following are a few examples that 

 have been noted, omitting the list given in Clapp's paper (6S) : 



Conspicuous Plains of inferior Levels 



Locality. 



Topographic 

 sheet. 



Elevation. 



Alassachu-'ietts 



Newtouville Boston 



(ireat Blue Hill Dedham 



Mansfield Dedbam 



Wrentham Franklin ....:... 



Franklin Franklin 



Plymouth district Plymontli 



Barnstable, two miles soutb Barnstable 



Truro Wellfleet 



North Truro Provincetown ... 



North Tisbury Marthas Vineyard. 



Vineyard Haven Marthas Vineyard 



Comiecticut 



New London and northward New London 



Norwich Norwich 



Bozrah Street ( "? t Norwich , 



I'lainfield Moosup 



Plainville Meriden , 



Southineton-Plantsville Meriden 



Rhode IsUiriO 

 Providence district ... 



Providence 



140-200 

 200 

 ISO 

 240 



2S0 



100-120 



80 



100-120 



100-140 



40- 60 



100 



Marine 

 summit. 



340 

 31.5 

 2.S.J 

 30«J 

 300 

 240 

 170 

 ISO 

 190 

 15.5 

 100 



90-160 



200-225 



100 



225 



200 



225 



200 



250 



200 



240 



200 



225 



4( »-20r) 



2(H) 



HOniZOXTAL LIXE! 



Closely related to the inferior plains are the clean-cut horizontal lines 

 which can relate only to fluidity. They occur at all altitudes up to th? 



