“3 
298 GEOLOGICAL RECONNOISSANCE 
whilst on the river bottoms the timber is large, and contains, in addition 
to the hickory, gum and elm. 
LAWRENCE COUNTY. 
The geological position of the rocks, along my route, have been mostly 
determined by their lithological character, owing to the almost total 
absence of organic remains; in one member alone of the magnesian lime- 
stones were any discovered, and they were only a few very. imperfect 
casts of the genus orthis, too indistinct for determination; also a simgle 
specimen of an orthoceralite, which is probably new. The want of so 
essential an aid to the determination of the position of rocks, (especially 
where there has been a great thinning out of the members, and a condi- 
tion which indicates a deposition on a very unequal bottom, together with 
a subsequent cutting away by currents of the deposited members,) renders 
the identification of equivalent formations difficult and uncertain. The 
accompanying section may therefore require, upon more minute investiga- 
tion and comparison, correction in some of the details; and, for the present, 
I shall only indicate the system to which I think they will hereafter prove 
to belong, without designating the particular member they may represent. 
The strata are lettered in the ascending order. 
All the members from 
ie 
: vo 
E rs (a). to (h) inclusive, be- 
ar el sar Far : long, most probably, to 
gol ele aterw a . . . : 
Jc rein aie the lower silurian period. 
J oar i ae 
i 5] |* Orange sand.” The remaining mem- 
a es ; 
[ bers (2) and (j), are of 
oil Rugged weathering limestone, with veins of 
y itl 30 calespar, and casts of a small cytherea. Ua nany date, 
7 : 
“ J a The thick-bedded mag- 
a RCS nesian limestone (a) and 
"OH (b) are the rocks in which 
9_©% cH | 15) |White chert bed, the zinc, lead, and cop- 
per ores are usually 
found. The copper is 
| | but sparingly dissemin- 
ae Massive saccharoidal sandstone, white, red- ated in ee % ETRE eae 
t\{ [| 60 | dish, ana variegated. spar veins ramifying this 
| rock. On the property 
of Mr. C. T. Stewart, 
= township 17, range 2 
I west, many small sam- 
