44 Phosphate Rocks of South Carolina, 
COMPARISON OF THE MARLS OF THE SAN- 
LEE, COOPER; AND-ASHLEY RIVERS AND 
OF THE SANTEE GREEN-SAND MARL. 
As is seen by the following table, the Santee and 
Cooper Marls contain a larger percentage of Car- 
bonate of Lime, (except when containing Green-sand,) 
than the phosphatic Marls of the Ashley Beds, they 
are therefore much better for lime burning than the 
latter. These analyses are taken from Ruffin’s Re- 
port: 
Per cent Percent 
Santee Marl, H.W Ravenel,| 95 |Ashley Marl, Brisbane, 64 
Ke P. Porter, 86 cs O’Neale’s, 76 
“ Fred’k Porcher, 92 ce Drayton Hall. 63 
« Wm. Cain, 87 a Ashley Ferry, 5° 
ee Lenud’s Ferry, 93 ce Magnolia, 75 
ee Eutaw, 94 cS Greer’s, 52 
x Vance’s Ferry, 86 C Pringle’s, 75 
oe Felder’s, 94 < Clement’s, 52 
Cooper River, Steep Bluff, 80 Kc Marysville, 62 
CG Point Comfort, 79 a Ramsay, 67 
as Dr. Huger’s, 95 “ Oak Forest, 36 
Ke Moss Grove, 80 ce Indian Fields, 5° 
Ayerdges en. 88.5-12, Average, ... . |60.2-12 
The GREEN-SAND MArRLS average 30 per cent. of 
Carbonate of Lime, and 22 per cent. Green-sand. 
Marl from Charleston Harbor, near Fort Sumter, 
taken forty-five feet below the surface of the water, 
after removing all the barnacles and recent shells ad- 
hering, contained 81% per cent. of Carbonate of 
Lime. Under the City of Charleston, at the depth 
of 274 feet it was 79 per cent. 
