72 Trilobites. 
Trilobites.—In examining, a few miles west of this place, in the 
same range of hills, the fossil contents of a rock, which is fine 
grained, but rather loose in texture, and tinged brown with the oxide 
of iron, I discovered, in a few minutes, no Jess than three imperfect 
and broken Trilobites, which are the first I have seen in place in the 
valley of the Ohio. A drawing of the most perfect specimen is 
given at Fig. 13. Portions of the abdomen are most common. 
- Fig. 13. 
. Description.—Breadth, one inch; length, about one inch and a 
half; diameter, half an inch. ‘Tergum or intermediate lobe thick ; 
one third thicker than the flanks, and more convex. Lobes deeply 
sculptured or furrowed, the whole of which are equal in size in all 
the lobes; encircled at the base with a flat horizontal zone, one 
eighth of an inch wide. Coated with brown oxide of iron, as are 
most of the reliquie of this deposit. No thorax or head found. 
The Trilobites are in company with innumerable relics of radiated 
Enerini, and thin, delicate, fine rayed Producti, similar to those found 
in the vicinity of the transition limestone, near the hot springs in 
Bath County, Virginia. Some very large and perfect Spiriferi, more 
than two inches in width, are found in the more compact and deeper 
seated deposit below. They are more deeply grooved and stronger 
marked than those from “Flint Ridge.’”’ I have also a very perfect 
bivalve from the same locality, which looks like a small, elongated 
Mya. As we descend deeper towards the base of the hills, these 
remains become more rare, the rock is finer grained, of a rich brown 
color, and furnishes a beautiful material for tomb-stones and chimney- 
pieces, and other ornamental work. The finest variety is singularly 
spotted with small dark specks, all through the stone ; it looks, when 
polished, as if it had been sprinkled with some dork liquid stain. 
It is a very curious fact, that a similar rock is found in Illinois, near 
