ECONOMICAL GEOLOGY. 
199 
the depth of 10 feet. There is probably no better illustration of the 
value of this species of marl as a fertilizer, than this farm affords, having 
been brought bv a liberal use of it, from the condition of one of the 
poorest farms in the region to that of the most productive. This locality 
is on the waters of Six Runs Creek, and marl seems to be abundant 
throughout the considerable section drained by this stream ; although 
unfortunately it is used by very few, so little contagious is a good exam- 
ple. Marl is also abundant about Magnolia, as at the Natural Wells; at 
Strickland’s ; at Whitaker’s, 3 miles east on Kenansville road, represented 
by No. 37 ; here cpiite light colored and shelly; and at A. IT. Grady’s, 5 
miles northeast of Kenansville, represented by No. 38. This latter is a 
dark gray, compact marl, streaked and spotted with decayed shells. It 
lies within two or three feet of the surface and is of unknown thickness. 
Indeed this marl may be found in almost every neighborhood of these 
counties, but unfortunately its value is not generally appreciated and its 
use is very limited, although I have never found the farmer that has 
tried it and concluded that it did not pay. 
Blue Marls of lenoir, Onslow , Craven and Carteret. 
39 
40 
41 
42 
43 
44 
Silica, Insoluble, . ... 
“ Soluble 
76.74 
0.64 
46.46 
46.42 
67.61 
0.36 
36.60 
55.28 
Ox. of Iron and Alum. 
6.20 
3.51 
5.00 
2.20 
6.94 
2 92 
Lime, 
0 . 4:0 
21.79 
25.21 
16.28 
27.20 
21.04 
Magnesia, 
0.16 
0.14 
0.13 
0.09 
0.87 
0.23 
Potash, 
1.04 
0.73 
0.31 
0.26 
0.55 
0.51 
Soda, 
0.00 
0.68 
0.30 
0.50 
0.45 
0.14 
Phosphoric Acid 
0.24 
0.16 
0.20 
0.85 
0.05 
0.43 
Sulphuric Acid, 
0.29 
0.70 
1.05 
0.32 
0.50 
1.96 
Garb. Acid, 
4.40 
16.80 
19.20 
11.43 
23.20 
16.40 
Org. Mat. and Water,. 
4. SO 
9.03 
3.20 
0.97 
4.00 
1.60 
On New River, Onslow county, shell marl is of common occurrence, 
immediately cverlying the Eocene, which has been seen to be so nearly 
universally present in this region. On Dr. Duffy’s place for example, 
there is a Miocene shell bank, of average quality, containing probably 
more than 50 per cent, of carbonate of lime. A few miles lower, at R. 
Barber’s, is a bed which has been opened and used to some extent. This 
is represented by No. 39. It is very sandy, and of poor quality. Nos. 
40 and 41 are from Mr. Rhodes’ place, some 2 miles from New 7 River; a 
