ECONOMICAL GEOLOGY. 
207 
Three additional analyses are given below of samples from beyond the 
state line on the upper waters of the Chowan. 
67 
68 
69 
Silica, 
59.12 
33.80 
43.00 
Oxide of Iron and Alumina, ... 
5.00 
0.92 
3.88 
Lime, 
12.99 
34.55 
25.09 
Magnesia, 
0.29 
2.52 
Potash, 
0.30 
0.18 
0.47 
Soda, * 
0.15 
0.25 
trace 
Phosphoric Acid, 
0.48 
0.41 
Sulphuric Acid, 
0.00 
0 00 
0.00 
Carbonic Acid, — 
13.90 
26.70 
22.20 
Water and Organic Matter, 
3.50 
2.90 
2.40 
No. 67 is from Flat Swamp creek, a mile north of Branch ville. It is 
the same marl in appearance and character as that on the Meherrin, and 
the bed is extensive. The same marl occurs on the Nottaway, half a. 
mile below the railroad crossing, (No. 69). At Dr. Massenberg’s, 2 miles 
north of the railroad between the Nottaway and Blackwater, a bed of 
marl, partly red and composed of comminuted shells, — a beach accumula- 
tion, and partly blue, like the last, crops out in the lower scarp of a hill 
about 30 feet in height. It is exposed to a depth of 8 to 10 feet. No. 68 
is from this point. There is another appearance of this marl at Franklin 
on the Blackwater. These beds were explored and analyzed in the hope 
and with the prospect of inducing the Raleigh and Gaston Railroad to 
inaugurate the business of transporting marl on a large scale, for the sup- 
ply of the region through which it passes. 
Other analyses, complete, or partial, have been made from time to time 
with the purpose of encouraging and extending the use of this valuable, 
but insufficiently appreciated resource of our defective agriculture. 
There remain a few localities to be explored : but the above exhibit is suf- 
ficient to accomplish the purpose in view, viz: of showing the unlimited 
extent, the wide distribution and the inestimable value of these manorial 
resources. Some analyses of New Jersey marls were given in the begin- 
ning of this chapter, for the purpose of affording means of comparison 
to such as have not access to the New Jersey Reports. The specimens 
given were all of Greensand marls, to which class most of the beds used 
in that state belong. But in the limited tract of that state, — less than the 
extent of one of our smallest counties, in which shell marl like ours, is 
found, it is highly appreciated and extensively used, being transported 
