A GEOLOGICAL HISTORY. 53 



of Long Island, is a formation of White Quartz 

 pebbles and sand, tinged yellowish with an oxide 

 of Iron, and may be seen on the road as you go 

 from Jamaica to Rockaway, and several other 

 places. It is said that at " Lloyd's Neck," fine 

 potter's clay in beds is found at tide-water mark. 

 I once saw a waggon load of shell limestone that 

 was brought from Long Island which had all the 

 character of that rock which is found at Cape 

 Fear, North Carolina ; this was brought to New 

 York to burn as a lime to be used for agricultural 

 purposes. The late Dr. Samuel L. Mitchill had 

 in his possession at one time, some oyster shells 

 (Ostrea Canadensis) said to have been taken from 

 a well on Long Island at the depth of thirty feet 

 or more. 



9th Diluvium.— (Plate 3, fig. 9.) The Diluvium 

 of Long Island is on that range of hills which 

 commences at Brooklyn Heights, and runs east 

 through Harbour hill to the village of Norwich 

 near Oyster Bay ; on both sides and on the top of 

 the ridge are all the varieties of boulder, gravel 

 and sand, as in the Diluvium of New York Island, 

 see page 18. 



10th Beach Sand,— (Plate 3, fig. 10.) This is 

 at the present time forming and altering its form, on 

 the south shore of Long Island where the ocean 



