218 GEOLOGICAL RECONNOISSANCE 
Black bituminous shale. 
Subecarbonifcrous or cavernous limestone, with 
interealations of sandstone and shale; con- 
tains large deposits of manganese, some iron, 
and copper pyrites. 
Massive saccharoidal sandstone. 
period; where it crops 
out, north of Rocky Point 
post-office, it has a thick- 
ness of about twenty 
feet. It is quite tossilife- 
rous: the most abundant 
fossils are, Productus 
cora, and P. clegans. One 
layer, full of entrochites, 
is hard enough to take a 
polish, and the fossils 
generally showing white 
on ablack ground, it will 
make a handsome mar- 
ble for ornamental pur- 
poses. This limestone is 
usually underlaid by the 
dark shales (g) of the 
section. 
Sandstone (f) is buff- 
colored, and rather soft; 
usually in - prismatic 
blocks near the base, and 
contains casts of subcar- 
boniferous fossils belong- 
ing to the genera spiri- 
fer, orthis, lingula, pro- 
ductus, nucula, and bel- 
lerophon, also fragments 
of trilobites. At Mr. 
‘|McDonald’s, on the head 
waters of Mud creek, 13 
miles from Batesville, 
this member is but a few 
feet in thickness, and 
rests upon dark, sheety 
shales; the sandstone is 
bedded in blocks from 
three to four inches 
thick, having an earthy 
look, and low specific 
