108 CARBONIFEROUS LIMESTONES 
below the same, warrant the opinion that this coal, though at a lower level, corre- 
sponds to sbittede Nos. 7 and 9, near Farmington. 
Discoveries of coal are Hep to have been made on Indian Creek, and at a 
point about three-quarters of a mile below Farmington, and one mile west of the 
Des Moines. 
At a mill-site on Indian Creek, about three-quarters of a mile above its mouth, 
no coal is visible; the section presenting the following members only of the upper 
carboniferous limestone series, all below the coal-beds : 
1. Overhanging ledges of sandstone, cellular and rugged at base (c’), 15 
2. Concretionary masses of impure magnesian limestone and blocks of sand- 
stone ; crystals of selenite disseminated ; marly earth in the interstices (b' » 15 
3. Band of same, more regularly bedded, ; 
4. Soft, marly, and argillaceous beds, ; , , 5 
5. Top of the geodiferous beds exposed (a’). 
The member 2’ is here much more irregular, both in composition and structure, 
than is usual; and, at this locality, it is useless for the purposes of construction. 
Two miles above Farmington it is much more uniform and solid; though a portion 
of the rock has that peculiar tubular and cellular structure, by which it is charac- 
terized at several localities higher up the Des Moines. 
‘On the waters of Indian Creek, near a Mr. Wilson’s, there is said to be coal; but 
I had no opportunity personally to examine it. 
About half a mile from the Des Moines, near the line between Sections 25 and 
26, Township 68 north, and Range 8 west, of the 5th Principal Meridian, on the 
farm of a Mr. Slaughter, a seam of coal is worked, about two feet in thickness, 
and occurring on elevated ground, within a few feet of the surface, it is covered by 
bituminous shale and soil. The quality is equal to that of any of the seams 
heretofore noticed. 
The beds which immediately underlie it are not exposed; but, a few rods from 
the coal-pit, fifteen or twenty feet down the descent of a steep hill, limestone shows 
itself; and at a quarry a few hundred yards further, Section No. 10, D, is exposed. 
The various members, however, will be more distinctly recognised in the follow- 
ing table : 
THICKNESS OF STRATA. 
Feet. Inches. 
1. Even-bedded limestone (/” dy : ; : : . 23 tod 
2. White gritstone (e’) : on 1S 
8. Marly, schistose layers, Witt sitiinte of iron, : 6 
4. Compact and obscurely odlitic white and Buhvorer Sesknberil . 2018 
5. Concretionary magnesian limestone, bo ktoed 
6. Cellular, close-textured, concretionary Caan (@’), 5 
7. Buff and flesh-coloured, close-textured, magnesian limestone, 20 
bs ‘Coneretionary magnesian rock, mixed with marl, 7 
9. Pebbly sandstones (¢’), 4 6 
10. Limestone containing Udiegure dis the bed of the wick, ’ (?) 
