Geology and J//.<<- V'' 7 - .<v. 



"Trap" from "Milk Row C 



Dune sand, Proi 

 Sand from bed r 



15. Ih>hiht8 on Louq r*Ut,,<1.—'X\\y> loll-oving facts are con 

 tributeil in a letter to Professor James D. Dana, from Mr. E 

 Lewis, Jr., of Rio klyn. gi\ in- tin eh vati.m and position of som< 



extends with sonic interruptions through a considerable portion o 

 Long Island, varies from 150 to :;s4feet above tide, and is of greai 



great terminal moraine of the ice sheet upon this part of the ocear 

 border, and afford, a- I 'nave elsewhere shown, data by whicl 

 recent oscillations of the eons! mav f»e determined.* Indeed, it if 

 by the presence and position of beds of modified drift upon thest 

 hills, and along their slopes, that the extent of subsidence sine* 

 the bowlder drift \w^ h p mm 1 ran I. ■ mil out. 



I>r!ll s's'ler'k - Xe'Vun-- 



are from measnr m nis made !>\ the writer and" others. In the 

 immediate vicinity ot some of ;'n- hills „ Ii — height- are given 



:i: • . ■, Jus is given tin 



distance of each locality from 'the Citv Hall in Xew York, as laid 

 down on the Map of Long K.-md. licginnirig at the extreme 

 eastern end of the island we have: 



Hempstead Harbor Hill 



iea the height to be 3544. feet above the water level c 

 * This Journal for March, 1877. Popular Science Monthly, Feb., 187 

 t From U. S. Coast Survey. 



- The 



