400 
GEOLOGY OF THE FIRST DISTRICT. 
“ II is remarked farther by Mr, Roberts, the agent of this company, that the Glen’s falls 
marble has gained a good reputation with most of the workers of marble in New-York, Boston 
and Philadelphia, as it regards its color, the polish w'hich it receives, and the ease with which 
it works ; and that it is considered equal to any of the kind in this country. He states that 
they have got out shelves for mantels seven feet and six inches long,* thirteen inches wide and 
one and a quarter thick, which sells for sixty-five cents per foot. The price for this kind of 
stuff has fallen, and at present it is worth from fifty to fifty-five cents per foot; that which is 
shorter, from thirty to forty.” 
The following section was made by Cadet T. Seymour. I did not see the quarry at which 
the section was made, but presume it is, as he supposes, in the Trenton limestone. 
Section at Marlit ^ Denham's quarries, near HoffmarHs ferry on the Mohawk, a few 
miles east of Amsterdam, 
No. Description of the strata. Feet. Inches. 
11. Dark colored limestone, seven layers_ 6 0 
10. Black compact shale- 2 3 
9. ........ 2 0 
8. Compact limestone (worked as a quarry stone)_ 1 4 
7. Slate—.........—- 1 3 
6. Compact limestone (worked)_ 2 0 
4. Slaty limestone, compact_ 1 6 
3. Light colored limestone_ 1 6 
2. Dark colored compact limestone (worked as a quarry stone)_ 3 0 
1 ........-. 
20 10 
During the month of June, 1840, one hundred and one cubic yards of stone were taken 
from this quarry for the Erie canal. 
Limestone of the Trenton group, and containing fossils, occurs in Greenbush, “five miles 
southeast of Troy,” and about two miles from Albany; and “ Schaghticoke, twelve miles 
north of Troy.”* 
In Orange county, near Mount Lookout, near Thompson’s limekiln, some fossils are found 
in limestone, which, it is supposed, belongs to the Trenton limestone.! 
The fossils of the Neeleytown limestone in Orange county have not been examined, but 
are supposed to belong to the Trenton limestone. This limestone is described by Dr. Horton 
■as follows ; 
* Vide Eaton’s Geological and Agricultural Survey of the Erie Canal, p. 81. 
+ If it does not belong to the Trenton rock, it doe.s to the Black river limestone, which forms Mount Lookout, and exists in 
other localities in Orange county. 
