208 W. Upham—Terminal Moraines of N. American Ice-Sheet. 
_It remains for us to notice briefly the probable extent and 
equivalency of these terminal accumulations of the ice-sheet, 
both to the east and west. Agassiz believed that the fishing 
banks or submarine table-lands, which lie at a distance of 100 
to 200 miles east and southeast from Cape Cod, Nova Scotia 
and Newfoundland, are such glacial isan On the other 
hand, it has been recently learned that fragments of fossilife- 
rous rock,* as tied of Miocene age, are brought up from 
the = -bottom on George’s Bank, Banquereau and the Grand 
Bank, by mn coralline growths attached to them becoming 
entangled with fishermen’s lines. These indicate that this 
coast, 1,000 miles in extent, is bordered by submerged Tertiary 
formations. similar to those that occur above sea-level in the 
Southern States, as had been already suggested by Professor 
©. H. Hitchcock,+ before this - discovery. Although it now 
seems likely that these older deposits form the principal basis 
of the fishing banks, it is clear that the opinion of Agassiz was 
part of the truth ; for besides the fossiliferous fragments many 
of granites and ‘schists are also obtained by the fishermen. 
Furthermore, the course of the extreme terminal moraine that 
crosses New J ersey, Long Island, Block Island, Martha's Vine- 
ard and Nantucket, has its ts line of continuation in these 
remarkable submarine banks, — It is probable, therefore, that 
they consist, somewhat like Gay Head, of Tertiary strata cov- 
ered with their own and foreign detritus brought by the ice- 
The later moraine of Cape Cod, the Elizabeth Islands, south- 
ern Rhode Island and the north shore of Long Island, was 
formed after the ice had retreated from its farthest limit, but 
in southern Michigan, in the Kettle Moraine of Wisconsin, and 
the Leaf Hills of Minnesota; while its farther continuation 
as ee r Verrill in this Sic TH vol. xvi, p. 3: 
- Appalachia, vol. i, p. oe and Geology of New ag preite vol. i i pe 2 
‘On the Extent cane re of the Wisconsin K e Moraine,” in ‘Trans: 
i of Saience. 
ournal of Geological Society, vol. bi ee rg14-623, wi with map. | 
