TT111] 



TOMBIGBEE SAND IN TISHOMINGO. 



71 



based upon the presence of iron pyrites. It was in the same formation, but 

 mainly in tho black micaceous sand, that several Georgia miners sunk a shaft 

 near Mr. Odum's, S. E. of Jacinto, S. 29, T. 4, R. 9 E.; after finding a great deal 

 of iron pyrites, at CO feet they struck yellow sand (belonging, perhaps, to the 

 Eutaw Group), and abandoned the "mine." 



The following section, from a cut on Polk's contract, Mobile & Ohio R. R. 

 (about S. 30, T. 2, R. 7 E., near the crossing of the Farmington and Danville 

 road) furnishes an example of the variety of materials sometimes found in the 

 strata of this group : 



(Sec. 7.) 



SECTION FROM POLK'S CONTRACT, ON MOBILE & OHIO R. R,, 

 TISHOMINGO COUNTY. 



The materials underlying No. 4, (the equivalent of the Rotten Limestone), 

 are non-effervescent. The stratification in the cut is very irregular, from the 

 great variations in the thickness of the strata. Numerous beautifully preserved 

 nuclei (interior casts) of bivalve shells have been found in excavating this cut, 

 but very few have come into my possession. Among those seen, Venilla 

 Conradi, Crassatella, Trigonia, Cardium and Oucullaea were conspicuous. 

 Sharks teeth, those of Mosasaurus, and an impression of a fish, have been 

 found here, but in which stratum I was unable to ascertain. 



111. At Jacinto, highly micaceous, black clayey sand is struck in most wells 

 at depths varying from 10 to 15 feet, its thickness being 7 to 8 feet ; then light 

 colored sands with freestone water. In the public well, however, a ledge of 

 indurate, limy sandstone was struck at 40 feet. — The same phenomena obtain, 

 With little changes, all over T. 3, RR. 8 and 9 E. ; N. E., and westward of Jacinto, 

 the hilly surface is occupied by Orange Sand of greater or less thickness. 



The same dark colored micaceous material, more or less calcareous, and 

 with obscure casts, occurs on the M. & 0. R. R., on King's Creek, S. 26. T. 4 



