No. 161.] 
89 
of bearing of the strata. These facts indicate that the boulders 
and blocks have been transported by some natural nneans, fronn 
their original location to the one they at present occupy. The 
size of Sonne of these nnasses, many of which weigh 100 tons or 
more, and the fact of their being imbedded in sand, gravel and 
loam, and that they repose upon the same materials, forbids the 
idea of their transport having been the result of powerful currents 
of water. Mountain streams often transport blocks of many tons 
weight to considerable distances, but never across beds of loose 
materials like clay, sand and gravel, without removing them also. 
The theory of transport by ice corresponds more closely with facts 
than any other which has been proposed. The occurrence of these 
boulders and blocks, as it were, in nests, on the north side of the 
hills, and generally on elevated grounds, strongly favors this view 
of the subject. The facts collected in relation to the erratic blocks 
and boulders are now numerous, and form an extremely interest- 
ing subject of investigation, in consequence of the important con- 
* elusions which may be drawn from them. 
Clays. 
The clays of Suffolk county are so abundant and varied in their 
characters, as to be adapted to various useful purposes. The beds 
are extensively wrought in some places, and the clays are mostly 
used for the manufacture of bricks; from 4,000,000 to 5,000,000 of 
which are annually made on West Neck near Huntington. 
White clays, which have the external characters of potter's clay, 
occur on West neck, t.oyd's neck, Eaton's neck, East neck and 
Little neck. 
Brown clays, suitable for stone ware, and others for coarse pot- 
tery, abound in many places in the west part of the county. Both 
the white and brown clays are carried to distant parts for these 
manufactures. Some of the clays have the external appearance 
of good fire clays, but actual experiment only can determine their 
fitness' for this use. These clays contain no lime, and therefore 
are far less likely to melt in the fire than ordinary clays. 
Some of the clay beds on West neck and Loyd's neck are ochre- 
ous, and perhaps they may be profitably used in the manufacture 
of yellow ochre. 
[Assem. No, 161.] 
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