174 GEOLOGICAL REPORT. |V290, 291, 292 



ilar beds probably exist on the headwaters of Buckatunna, in N. E. Clarke county. 



290. In the S. VV. corner of T. ■», R. 17 VV., wc find, on Suan- 

 lovey Creek, at a bridge, a bed of bluish marl resembling that of 

 By ram. The thickness of this marl stratum I have not ascertained 

 — it probably crops out on the creek below this spot also ; and the 

 same marl is found near Quiunan; and cast of the same, on the 

 waters of the Bin kaiunna. 



At Qditman, it does not appear in the bluffs of the river, whore only a blnish- 

 black, clayey sand is to be seen; it occurs at a higher lev el, in the wells at 

 Quitman, and at Smith's Sulphur Spring, south of the town, where it very 

 closely resembles the Byram marl, save in that it dees not contain (excepting 

 oysers) any well-preserved shells. It is fuither seen in branches (or several 

 miles south of Quitman, where it also appears in the banks of the Chickasaw hay 

 River. Thus far the marl closely resembles the blue marls of the Vicksburg 

 strata, containing a considerable amount of greensand grains. 



Further south, at the crosfing of Failing Ureek, (our and a half 

 miles from Quitman, wc find it associated with while, sandy marls 

 without greensand grains, resembling in general those of the Bran- 

 don neigborhooJ (1F218, Sec. HO). Of the marls occurring at this 

 point, the blue (No. 8 of the section) is of course preferable as a 

 manure. On this creek, and on the Chickasawhay River above 

 the mouth of the same, marl may be looked for. On Coonupy 

 Creek, however, and on the Chickasawhay near its mouih, we (ind 

 brown clays containing no shells, and of no value as a manure. 



291. Southward of Coonupy Creek, we once more come to the 

 territory of the yellowish-white clay mails of the Jackson Group. 

 Here, however, 1 have not met with so much of the stiff clays seen 

 elsewhere; the mail is more generally of the character of that 

 from Langley's field, like which it contains many ferruginous or 

 rusty casts of shells — as may be seen on many of the prairie hill- 

 sides. 



The marl in the banks of the Chickasawhay at Dr. Ogburn's, S. 21, T. 1, R. 

 16 E , is scarcely to be distinguished from that of stratum No. 6, at Moi dy's 

 branch (Sec. 29, 1}204). an analysis of which is given above (Tf282). At Dr. 

 Ogburn's, the marl is so near to the surface of the ground that it can readily 

 be reached in pits dug in the field itself; and its effects on the productiveness of 

 the soil are much praised by Dr. O. The stratum as exhibited en the river 

 banks, underlaid by brown and red clays, is about thirty feet in thickness. 



29_\ r-outh of Dr. Ogburn's, on Garlands Creek, we find exhib- 

 ited two strata of greensand marl, corresponding, apparently, to 

 the blue mail at Jackson, like which, they arc ovc. laid by white 

 mails. 



The strata occurring in this locality have been mentioned above (1f 210); 

 the upper stratum consists of greensand giains imbedded in gray calcareous 

 clay, together with many entire t-hells. An average specimen of this marl (air- 

 dried) lost 11.944: per cent, ot water by ignition, and was conuposeJ as follows: 



