584 Vals dh Jaye VUMD) Als (Go JEIROUNZURID) 
Se 
NW Bu ON 
4 
Feet Inches 
Limestone, heavy ledges, exposed along Manson branch 
and Cooper Creek at Centerville, as well as at numerous 
other points in the county, the ‘‘fifty-foot limestone,” 4-10 
. Shale, argillaceous, blue and red in color, - - 14 
. Shale, arenaceous, frequently forming a well defined 
sandstone, as in boring No. 3 (No. 13), and the Rock 
Valley shaft, - - - - - - - - 
. Shale, argillaceous, blue to gray, - - - - me) 
. Limestone, somewhat variable in thickness; exposed 
along the C., M. & St. P. railway, between Mystic and 
Brazil, known as the ‘“seventeen-foot limestone” or 
GOS moO, = - - - - - - - 13 
. Shale, sometimes gray, frequently bituminous and pyriti- 
ferous, - - - - - - - - UT 
. Limestone, sometimes gray, and coarsely sub-crystalline 
as at the Lodwick mine, Mystic; sometimes fine-grained, 
bituminous, and grading into the shales above and below, 
as at the Thistle mine, Cincinnati; known as the “cap 
rock,” - - - - - - - - - Dal 
. Shale, usually bituminous, and known as ‘‘slate;”’ occa- 
sionally in part soft and clay-like, then known as clod ; 
at times heavy and homogeneous non-fissile, in which 
form it is known as ‘“‘black bat,” - - = - 1-3 
. Coal, upper bench, usually, : = : - : I 8-10 
. Clay parting ““mud band,” - - - - - 2— 3 
. Coal, lower bench, usually, - - - - - 8-10 
Clay parting the “ dutchman,” : = 2 = VA 
. Coal, frequently not so pure, - - - - - 2- 3 
- Fire’ clay, - - - - - - - - 1-6 
. Limestone, “bottom rock,” well exposed along Walnut 
Creek at Mystic, = : - - - - - 3 6 
This section was first made out in 1893 and published in the 
following year.t It was not, however, until 1896 that the name 
Appanoose was applied to the beds. At this time* they were 
defined as a subdivision of the Des Moines formation and sec- 
tions were given illustrating their relations to the underlying 
and overlying strata. Above the Appanoose formation there is 
t Amer. Geol., XIII, 407-411; Proc. Iowa Acad. Sci., Vol. I, Pt. IV, 33-36; lowa 
Geol. Surv., II, 407. 
2Towa Geol. Surv., V, 378-394. 
