88 GEOLOGICAL SURVEY OF ALABAMA. 
[Black Fireclay Seam in the N. W. corner of section 35, township 21 S., 
range 4 W.; rate of dip 2°.] 
LANMUNATEDSANOS TONE 
4 QBINCHES SOFT WHITE SLATE 
SMEs ek’ OA 
/Ffoor COAL 
BINCH DARN colofeD SLATE 
INCHES COAL 
Meer eae 07 
BLACK Fipe-clpy 
The next seam above this isthe Stine seam ; the top seam 
is the Luke seam, which can be seen above the Big Fall on 
Davis’ Creek, at one of my test drifts made before or about 
the beginning of the late war; the roof is a thick ledge of 
conglomerate. 
A peculiar feature marks that part of the Cahaba Coal 
Field having the Montevallo seam underneath it, viz: the 
ground is covered with scattering pebbles where the con- 
glomerate measures come to the surface ; where the sand- 
stones outcrop an absence of the pebbles will be noticed 
through a belt or strip of country until the next ledge of 
conglomerate with its pebbles come tothe surface. This is 
the case over a large area of the Lolley basin. The outcrop 
of the Montevallo seam on the accompanying map will 
show its limit. 
There is another, and in places, a thick ledge of conglom- 
erate over the Thompson seam ; it shows plainly on the 
surface, but this must not be confused with the conglomer- 
ate above the Montevallo, as it is a long distance underneath 
the Montevallo seam. There is another thin ledge of con- 
glomerate still below the above, this one is near the lower 
bench of the Mammoth seam, or Clarke. This will not 
cause confusion in this basin as it is close to or in the Piney 
Woods fault. 
The conglomerate formation above the Montevallo seam, 
has the purest springs of free stone water in the territory 
where they come to the surface, of any in this section of 
country. Wherever it forms'the surface rock, its topography 
being high or rolling, it is remarkably healthy, probably 
more so than any other part of the State. For a more de- 
tailed statement or description of these ledges of conglom- 
