Flint Ridge Section. 77 
the action of the torrents and wintry frosts, into a grotto of considera- 
ble size, called the “ wild cat’s den,” from the fact of one or two of 
those animals having been killed here in early days. It will serve as 
a landmark for others who may wish to visit the place. From this 
spot I followed down the deep ravine of the run, a considerable dis- 
tance, as far as [ could conveniently go, the sides of which were 
very abrupt and gave quite a satisfactory view of the stratification. 
My examination ended with a deposit of yellow Ochre, in the bed 
of the run, which I shall make the first step in the section. 
Section of Rock aie at Flint Ridge Order ascending. 
Petals tae | § 
Cos 
Bed of run or branch. 
1. Argillaceous, slaty earth, resembling ochre in appearance ; col- 
or, pale yellow; forming the bed of the run; depth, unknown. 
2. Resting on the ochre, lies a deposit of slaty, light grey, sand- 
stone, containing considerable white mica in fine scales; easily 
pang and decomposing when exposed to the weather.—8 feet. 
. Bituminous shale ; below, with traces of coal; upper part of 
eis bed, dark clay slate, wondideratly compact in slices The su- 
perior portion of the deposit, very fissile and highly calcareous, near- 
ly black ; containing numerous specimens of fossil shells, generally 
nny terebratule and the upper or flat valve of the Productus, No. 
2, figured on plate 2, Vol. 29 of this Journal. Many of these 
shell still retain the cuticle.—10 feet. 
4. Light gray compact limestone; in some places mixed with 
silex ; breaking into irregular conchoidal masses and containing or- 
