112 GEOLOGICAL SURVEY OF ALABAMA. 
of this the Carboniferous is completely covered with drift. 
Thence southeast to the half mile post on the west side of 
section 6, township 23, range 9 east; thence northeastwards 
along the boundary fault, crossing Schultz’s Creek about a 
quarter of a mile north of the wagon road bridge ; passing 
Schultz’s Creek church about 700 yards to the north of it, 
and continuing on along the boundary fault to a point two 
hundred yards west of Joseph Lightsey’s house in the 
northeast quarter of the northeast quarter of section 20, 
township 24, range 10 east; thence northeastwards along 
the northwest side of the vertical measures of the “Interior 
fault,” crossing the railroad about half a mile southwest of 
Cadle Station, and crossing the Cahaba river near the half 
mile post at the south side of section 2, township 22, range 
5 west ; continuing northeastwards along the northwest edge 
of the Interior fault vertical measures to opposite Booth’s 
Ferry, in the south half of section 19, township 21, range 4 
west, the point of commencement. 
The Blocton basin is drained by the Cahaba river and its 
tributaries, Shades Creek, Cane Creek, Little Cane Creek, 
Bear Branch, Big Ugly Creek, Little Ugly Creek, Caffey’s 
Creek, Turkeycock Branch, Lick Branch, Green Branch, 
Pratt’s Creek, Stone Quarry Branch, Hill’s Creek, Schultz’s 
Creek, and Haysop Creek, the waters of all these creeks 
and branches finally reach Cahaba river. It is along the 
valley of one of these creeks (Caffey’s Creek) that the 
Cahaba Coal Mining Company built their railroad, enabling 
them to open up their mines in this basin; this was the 
easiest route by which they could get railroad access to the 
seams in this basin, though the engineering difficulties of 
the route brought the cost of their nine miles of railroad 
up to over $160,000. 
The most prominent ridges of this basin are Sand Moun- 
tain, formed of the lower portion of the Millstone Grit, ex- 
tending all along the northwest side of the bagin, though it 
is a little broken at its southwest end. The next ridge in 
prominence is the ridge formed of the roof rock of the 
Underwood or Thompson seam. 
This basin, like all other parts of the Cahaba Coal Field, 
ig not well provided with good wagon roads. The principal 
