1300] 



BARNES' MARL. 



179 



similar materials between the localities just mentioned, and Pearl 

 River. On the latter, as stated before, blue, green and white clays 

 usually form the material of the strata of the Grand Gulf Group, 

 which appear to be very generally rich in Potash, Soda and Mag- 

 nesia, and often in Gypsum ; but it is only in one point that I know 

 them to contain a notable amount of carbonate of lime ; viz : near 

 Mr. Ben Barnes' place, SS. 2 and 35, TT. 4 and 5, R. 12 E., Marion 

 county. 



A high ridge here comes up to the river, and has been washed off into a steep 

 bluff about 110 feet high from the water's edge. It continues along the river 

 for four or five miles below, sometimes coming up close to the bank, but gener- 

 ally at a distance of 200 to 300 yards from the latter, on the west side ; its 

 upper portion being formed by deposits of gravel and sand of the Orange Sand 

 Group, the lower, by the gray or variously colored clays and loams of the Grand 

 Gulf Group. 



The following is the profile afforded by the strata at the " White 

 Bluff," on the sections above given : 



(Sec. 39.) 



SECTION OF "BARNES' WHITE BLUFF," MARION COUNTY. 



300. Of the several materials occurring at this outcrop, stratum No. 5 is the 

 one which at once suggests itself as suitable for use as a fertilizer — more espe- 



