28 GEOLOGICAL SURVEY OF ALABAMA. 
great disturbance that would inevitably follow the upthrow 
of 10,000 feet, and the pushing of these measures up to the 
vertical, we can not reasonably expect all the seams to re- 
tain their relative position, so that they can all be identi- 
fied with same seams in the regular measures of the basin, 
and even if we could, the fact would have no economic value 
to the miner, working the seams adjacent, since these ver- 
tical seams cannot be profitably worked. 
At the south end of this basin, opposite DeLoach & 
Co.’s grist mill, a steep dip of forty degrees to southeast in 
the regular measures takes place, bringing additional Coal 
Measures to the surface and exposing the Montevallo seam 
and the lower plates of the Montevallo Conglomerate, 
which can be seen on the road from Birmingham to Colum- 
biana. 
At Henryellen, the ledge of conglomerate over the Con- 
glomerate seam shows itself at a point north of the com- 
pany’s store and office, behind the miners’ dwellings. It 
does not show prominently, as it is thin; the pebbles are 
not abundant, nor large, but they are there. In the Coosa 
Field southeast of that point, the same plate of conglomer- 
ate is reduced to a thickness of two feet. In the south end 
of the Cahaba Coal Field this plate of conglomerate makes 
but little better showing than it does in the Henryellen 
basin. Thin plates of conglomerate are scarcely ever uni- 
form in thickness. 
The seams on the east side of the basin, outcropping 
within two hundred yards of the vertical faulted coal meas- 
ures, are mostly irregular in thickness, evidently the result 
of the immense upthrow of the boundary fault. The even- 
ness and regularity in the strike and dip of the coal meas- 
ures of this basin are extraordinary ; I have not noticed any 
faulty derangement in the interior of the basin except a 
slight fault showing on section 7, township 18, range 1 
west, on Suck Branch and Rocky Branch, though the indi- 
cations were not serious enough for me to try and work it 
out. West of Suck Branch, in section 12, close to Henry 
B. Hanna’s house, is an exposure of a seam of coal called 
in the neighborhood, the Poole seam, of which the following 
is a section : 
