134 GEOLOGICAL REPORT. | ' 209, 210, 211 



seems to be in many cases the result of disintegration, rather than a stratum 

 occuping a distinct position in the Tertiary — properly, perhaps, in its present 

 condition, a member of the Orange Sand Group. . Lower down, on S. 8, we find 

 black prairie soil in the bottom of the creek. I have not heard of the occur- 

 rence of any calcareous strata N. of Garlandsville. The road from Garlands- 

 ville to Paulding runs on a sandy ridge, on both sides of which belts of black 

 prairie, on which the Zeuglodon is found, extend along the streams. In the 

 " lime country" S. of Paulding, however — (about Claiborne P. 0.,( no Zevylodon 

 bones are reported to have been seen. 



209. In Clarke and Wayne, the Jackson Group, although its territory is 

 diminished in width, is well and characteristically developed, and affords good 

 opportunities for observation. 



From the hillside on Coonupy Creek, where it first appears on the Quitman 

 and Winchester road (l[196), we trace the whitish marl of this group south- 

 ward, through outcrops and prairies, to the neighborhood of Dr. Ogburn's, S. 21, 

 T. 1, 11. 16 E., Clarke county. Here we find on the bluff of the Chickasawhay 

 River, about 30 feet of calcareous, fossiliferous materials, underlaid by gray and 

 reddish laminated clays — the same, no doubt, as those cropping out on 

 Coonupy Creek. The upper portion of the marl stratum resembles greatly 

 stratum No. 6 of the section at Moody's branch, and contains, among other fossils. 

 Morio Petersoni, Leda multilineata, Eostellaria velata, Mactra funerata, Cytherea 

 imitabilis, Turritella alveata. My last visit to this point having happened 

 during high water, I was unable to determine whether Nos. 4 and 5 of the 

 Jackson profile (Sec. 26) are represented here ; specimens of the underlying 

 clay, however, were collected by me in 1855. — They are unequivocally present, 

 however, in an outcrop about a mile S. of Dr. Ogburn's, at the bridge across 

 Garland's Creek. 



210. There are about 7 feet of the tertiary strata visible above the bed of the 

 stream, which itself flows on a material closely resembling that on Pearl River, 

 at Jackson — a blue sandy marl, with numerous shells, and grcensand grains. 

 This material extends, unchanged, up to about 5 feet above the bed ; then, 

 there overlies a mass consisting of shells and numerous, large grains of green- 

 sand — an analysis of which will be found in another place (lf292). Both beds 

 contain, in well preserved condition, the shells of the Jackson Group, among 

 which even a superficial search detected twenty-two species of the leading 

 Jackson shells. 



Between Garland's Creek and Suck Creek, 1 mile S. of the former, wc 

 again find prairies, and at the crossing of the latter stream, we find its bed 

 entirely excavated into bluish white marl containing but little sand, and 

 essentially the prevalent fossils of stratum No. 7 of the McNutt Hills (Sec. 27), 

 viz : corals, oysters, Pecten nuperus, Scutdla, and vertebra? of fish. 



211. At and near Gen. W. B. Trotter's plantation, S. 3, T. 10, P. 7 W., the 

 Jackson strata arc finely exhibited. The country between this locality and 

 Suck Creek, is also chiefly of a prairie character, and so is the greater portion of 

 the plantation itself. The black prairie soil is underlaid by a stratum, of variable 

 thickness, of yellow, and lower down, greenish yellow underclay, more or less 

 calcareous, without fossils. Beneath this we find on the hillsides, about ten feet 

 of a soft, whitish, calcareous mass, apparently without fossils ; beneath this 

 again, there is a ledge more or less indurate in its different portions, not well 

 exhibited, but about 4 to 7 feet in thickness. In this led-e, which is touched 

 by the plow, Zeuglodon bones and oysters abound, together with teeth of 

 Carcharodon, large vertebrae of fish, and nuclei of bivalves and univalves. 

 Among the latter, found associated withthe vertebrae of Zenahdon, is Gypraea 

 fmestralis ! — and Coin's tortilis ! — also, a very large (4 to 5 inches long) 

 Pyrula, not seen elsewhere 



A few feet below the level of this stratum, is the top ledge of the profile given 

 by L. Harper (Report, p. 144), occurring in a gully about 18 feet deep, in which 



