CAHABA COAL FIELD: HENRYELLEN BASIN. 27 
benches increases in thickness to over one hundred feet in 
places, the sandstone being remarkably white, and very 
noticeable wherever it is seen. This split in the Mammoth 
continues on down southwest to the south end of the Cahaba 
Coal Field, the intervening measures between the two 
benches varying in thickness from thirty-five feet in the 
Henryellen neighborhood, to one hundred and eleven feet 
at Helena, and to ten feet southwest of Gurnee. The Black- 
shale seam and Buck seam are the names given to the two 
benches of the Mammoth, near Helena; the Gholson and 
Clark are the names applied to the same at Gurnee. 
Continuing on from the Mammoth along the direction of 
dip, and passing over three hundred feet in thickness of 
measures, you cross the outcrop of three thin seams, repre- 
sented at Helena by the Moyle seam, the Little Pittsburgh, 
and the Smith-shop seams, you then arrive at the Conglom- 
erate or Thompson seam, which is here five and a half feet 
in thickness, but impure and slaty and not workable. Con- 
tinuing along in the direction of the dip, passing over about 
one hundred and fifty feet of measures, you cross the out- 
crop of one thin seam, and then arrive at the Helena seam, 
divided into two layers here, as it is both in the Helena 
basin, the Dry Creek basin, and the Lolley basin. In the 
Henryellen basin the Helena seam is dcuble, with four feet 
of sandstone intervening; the lower layer contains three 
feet of coal, and the upper layer contains three feet, nine 
inches of coal; the upper layer is the one on which the 
Henryellen Company sunk their old No. 3 slope, the coal 
being of excellent quality. 
About sixty-five or seventy feet above the He:ena seam is 
another seam, varying in thickness from two feet to six feet; 
above this seam there are about a hundred feet of sand- 
stone and slaty sandstone, between it and the ver‘ical fault 
measures. I have made various measured sections across 
these vertical fault measures, and could recognize particular 
seams and rocks, but found them in such a crushed, dis- 
placed condition that I could never make the sections match 
the sections taken in the regular measures of this basin; in 
the same efforts at the south edge of the Cahaba Coal 
Field, I met with similar results. When we consider the 
