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[Assembly 
The rock dips from each side of the fmcture at a very small angle. — 
Flat rock is more or less a conglomerate, and is generally a coarser 
sandstone than the variety at Potsdam or Keeseville. It occupies an 
area of several miles, and presents quite a remarkable aspect. It is co- 
vered mostly with low shrubs and whortle bushes, with here and there a 
solitary tree which has monopolized a little more earth than its humble 
neighbors. 
Economical Productions. 
Under this head I shall speak of a few only, and those which are of 
the most value. 
Sandstone for glass. — The sandstone which lies along the borders of 
this formation and near the primary rock is often of a pure white, it 
possesses a loose granular texture, which is often increased by weather- 
ing, it then passes into a sandy variety. In this state or condition the 
rock furnishes an important material for glass, and is extensively em- 
ployed in its manufacture. The most important localities which fell 
under my own observation were in the township of Mooers. The ma- 
terial is abundant and of the best quality. 
Black marble. — A valuable quarry of black marble exists in Chazy, 
near the lake, and nearly opposite Isle La Motte. It is probably a con- 
tinuation of the same stratum, which is quarried upon the island. The 
same stratum, I have observed at other localities. It furnishes a jet 
black surface, and receives a beautiful polish, and is, altogether a fine 
production. 
The same varieties of the transition marbles are more or less abun- 
dant on Valcour's island. It is scarcely necessary to add, that this mar- 
ble district is capable of furnishing lime to any amount, either for ma- 
sonry or agriculture. There is one difficulty in raising the limestone, 
which it is important to bear in mind, viz: the small dip of the rock, 
or its nearly horizontal position; the expense and difficulty is conse- 
quently increased. 
Iron ores. — After what has been published in the preceding reports 
it is scarcely necessary to enter upon a detailed account of the ores of 
Clinton. It will be sufficient to refer to those reports with this remark, 
that by far the larger proportion of ore beds exist in the south part of 
the county, in the neighborhood of Clinton ville, Keeseville and in the 
vicinity of the forks of the Au Sable. There are as many as a dozen 
beds in this region, some of which are known the world over for the 
excellence of thp iron, which they furnish. 
