88 



by the subjoined analyses (No. i of Table F, and 5 and 6, Table 

 G.) The character of the clay of Grand Gulf formation near 

 St. Stephens is shown in analysis No. 8 of Table G. 



Below St. Stephens there is deep water to Mobile, with the 

 exception of one bar, which may be removed without much 

 trouble or expense. 



Oven Bluff. Frcrn Hobson's quarry, just above the Lower 

 Salt Works Landing-, down to Oven Bluff, a distance of 2 

 miles, the orbitoid&l limestone or chimney rock occurs at the 

 base of bluffs of Tertiary age. 



At the quarry the hard limestone, which is being taken up 

 for riprap work, lies ,as at St. Stephens, just above the soft 

 chimney rock. Along the stretch of river above described this 

 chimney rock is seen in a bed 15 to 20 feet in thickness, just 

 above the river bottom, and is easily accessible. Analysis 2, 

 Table F, of a, sample from Oven Bluff will show the quality 

 of the limestone here. As regards clay three varieties have 

 been examined, a residual clay from over the limestone, a 

 swamp-bottom clay from the low grounds of Leatherwood 

 Leatherwood Creek, and clay from strata of the Grand Gulf 

 formation which here overlies the St. Stephens limestone. The 

 analyses of these clays have not yet been made. 



The first shoal in the river abov/e, Mobile is a few miles above 

 Oven Bluff, so that from this place down there is a Q-foot chan- 

 nel at all seasons, which will give to Oven Bluff a certain ad- 

 vantage over other localities in regard to transportation. The 

 shoal mentioned is one which can be removed, so that St. Ste- 

 phens may be classed with Oven Bluff as regards transportation 

 by water, except that the former is some miles farther from the 

 Gulf than the latter. 



Analyses by Dr. Mallett of other specimens of this chimney 

 rock are here presented!. No. 8, Table F, is of a specimen from 

 Colonel Darrington's place, in the lower part of Clarke county 

 near Gainestown, and 9 and 10 are from other localities in 

 Clarke county near the rivers. 



Localities along the line of the Southern Railway. At Glen- 

 don station, a few miles east of Jackson, there is an exposure of 

 the chimney rock close to the track. The rock here is about 

 20 feet thick, and the limestone is covered by a bed of red re- 

 sidual clay similar to that at St. Stephens and Oven Bluff. The 

 same chimney rock may be seen along the road between the sta- 



