236 
GEOLOGY OF THE FIRST DISTRICT. 
Shell Banks of the CoxVst of New-York, 
These are very numerous on the coast of New-York, and of all New-England. The 
reasons have already been given why they are considered as alluvial, and caused by the labor 
of man, mostly by the aborigines of the country (see pages 21 and 175 of this volume). 
Some of the more prominent localities only will be mentioned. From some of them, thou¬ 
sands of cart-loads of the shells have been removed, and spread over the lands, to increase 
their productiveness. They decay very slowly, and act to alford lime for a long time to the 
soil and to vegetation. 
Several localities were observed between Canoe place and Sebonac neck. Cow neck and 
Farrington’s neck, near the shore, and generally near the heads of the small bays and on 
their sides; sometimes bare, and sometimes covered by one or two feet of drift sand. Ano¬ 
ther on the west side of Great Hog neck, two miles from Sag-Harbor. Another near Old 
Man’s harbor. Large quantities have been removed from these beds for manure. 
Alluvial Sandstone and Conglomerate. 
Some localities of these have been mentioned, (see pages 122 and 160 of this volume.) 
Alluvial sandstone was observed in many places along the north coast of Long island, formed 
by the chalybeate springs depositing iron as a cement between and around the grains of sand 
and gravel. Many large blocks, that had tumbled from the cliffs, were lying on the shore. 
They may be seen one quarter of a mile east of Hudson’s point, and half a mile and one mile 
east of the same. These distances may not be strictly accurate ; they were estimated by the 
eye. At the last mentioned locality, a chalybeate spring flows from the ravine, and has caused 
the yellow and reddish color of the sands, and the aggregation of sand into rock. 
Agaric Mineral. 
This is said to occur near Catskill. The exact locality is not specified.* I did not find it. 
Bog Ore. 
Many of the springs that flow from the north side of Shawango neck, west of Montauk 
point. Long island, are highly impregnated with iron, and some bog ore is deposited in the 
pond-holes and marshes. 
In Stillwater, Saratoga county, bog ore is found on the land of Mr, David Montgomery. The 
locality is four and a half miles north of Maltaville, and three miles west of Stillwater. It was 
Robinson’s Catalogue of American Minerals, p. 120 ; and Cleaveland’s Mineralogy, p. 170. 
