310 The American Geologist. November, 1903. 
Manhasset gravel consists of sands and gravels containing 
abundant slightly weathered granitic material, and was prob- 
ably deposited during a submergence to the 200 to 240 foot 
level, at which altitude they form a marked plateau along the 
north shore west of Port Jefferson. At some points a bowlder 
bed, composed of what seems to be berg-dropped materials, 
occurs near the middle of the series. The present work has ex- 
tended the Manhasset area far to the eastward, the gravels be- 
ing exposed beneath the Wisconsin moraine to Mattituck, and 
again beneath the morainal drift on Shelter island and of the 
south fluke to Xapeague bay. South of the moraine they have 
been found by the writer in strong development in the form 
of terraces near Bethpage and as a sheet over the Half Hollow 
hills. They constitute the low Rockaway ridge and Barnum 
island swells and are shown by well sections to frequently un- 
derlie the Wisconsin outwash plains at a depth of a few feet at 
many points. They overlie all older deposits unconformably. 
The deposition is believed to have taken place when the ice 
rested close to the north shore of the island. On the north 
shore the gravels constitute the major portion of the Pliocene 
or Pleistocene yellow T gravels of Hollick, s the Pleistocene yel- 
low gravels of Merrill, 9 and the Manhasset gravels of Wood- 
worth. 1 " while on the south shore of. the island they are the 
supposed Tertiary gravels of Crosby 11 and Woodworth. 12 It 
is probable that they are to be correlated with the Mohegan 
Bluff beds of Block island, 1 ' 5 the Tisbury beds of Martha's Vine- 
yard, 14 with a part of the Truro beds of cape Cod, 15 and with 
certain gravels of the north shore of Nantucket. 10 No repre- 
sentative was detected by the reconnaissance of Mr. Knapp 
and the writer in New Jersey, but their altitude and relation to 
the Pensauken suggests that they may be the equivalent of Mc- 
Gee's Lower Columbia deposits of the Atlantic coastal Plain. 1 ' 
The Manhasset stage is separated from the Wisconsin by a 
long erosion interval, apparently similar to the Peorian inter- 
val between the Wisconsin and Iowan in the West. In weath- 
ering they agree with the Iowan deposits rather than with the 
much more strongly weathered drift of the Illinoian stag:'. 
Early in the work they were provisionally assigned to the Iow- 
an while the subsequent erosion interval was regarded as the 
Peorian. Later Mr. A. C. Veatch, who was associated with the 
