24 THE GEOLOGIOAI, STRUCTURE, ETC. 



lowest Tertiary beds, a bore was put clown to a depth of 1,062ft. 

 The drill passed through pretty nearly the whole of the imper- 

 vious strata, and stopped in a bed of very fine green sand, 

 belonging to the Eutaw Group, and did not apparently penetrate 

 to the base of the water-bearing rocks. The top of the water- 

 bearing rocks was met with at 960ft. ; two small supplies 

 of overflowing water were met with at 964ft. and 1,005ft. 

 respectively. 



An artesian bore at Bladen Springs commenced in Tertiary 

 rocks, and terminated in that formation at a depth of 1,345ft. 



At Pollard, Escambia County, 80ft. above sea level, a supply 

 of water was obtained from Miocene Beds at a depth of 70ft., 

 with a pressure capable of forcing the water to a height of 30ft. 

 above the surface. 



Another well at Mobile, near the head of Mobile Bay, was 

 carried down 650ft. in Miocene Strata, but was not continued 

 far enough to pierce the beds of the Potomac Group. 



From Alabama, a similar series of beds extends northward 

 through the State of Mississippi, and as far into Tennessee as the 

 junction bf the Ohio and Tennessee rivers. The geological 

 structure of the Cretaceous and Tertiary areas of these two 

 States is identical with those last described. 



I have been unable to find any reference to artesian wells 

 in the favourable area, but there is little doubt in my mind that 

 efforts in this direction would be crowned with success. 



Owing to the enormous area covered with Tertiary and 

 Recent strata, the water-bearing Cretaceous rocks do not 

 reappear at the surface nearer than the western corner of the 

 State of Arkansas, not far from the head of the Onachita River. 



The eastern portion of Texas is mainly a continuation of 

 the Great Coastal Plain, other portions of which constitute both 

 the Atlantic and Gulf Border regions, and a part of the North 

 Mexican district, but that plain here gradually merges into the 

 higher lands of the Great Plains of the interior. The inland 

 boundary of the eastern part of the Texan region corresponds to 

 the line of surface junction between the Palaeozoic and Mesozoic 

 rocks. The general elevation above the sea of much of the 

 ^eater part of the surface of the region is comparatively slight, 

 and that along the inland boundary seldom reaches 1,000ft., 



