[ 50 ] 
N° Iv. 
Defcription of a remarkable Rock and Cascave, near the 
weftern fide of the Youghiogeny river, a quarter of a 
mile from Crawford’s ferry, and about twelve miles from: 
Union-Town, in Fayette county, in the ftate of Penn-- 
Sylvania. 
BY THO. HUTCHINS: 
arash, HIS cafcade is occafioned by a rock of a fe= 
micircular form, the chord of which, from 
one extreme end of the arch to the other, is nearly one 
hundred yards ; the arch or circular part is.extenfive, and 
upwards of twenty feet in height, exhibiting a grand and 
romantic appearance. This very curious production is 
compofed of ftone of variegated colours, and a {pecies of 
marble beautifully chequered with veins running in dif- 
ferent direCtions, prefenting on a. clofe infpeGion a faint 
refemblance of a variety of mathematical figures of diffe- 
rent angles-and magnitudes. ‘The operations of nature 
in this ftru€ture feems to be exceedingly uniform and ma- 
jeflic; the layers or rows of ftone of which it is compofed 
are of various lengths and thicknefles, more refembling the 
effets of art than nature. A flat thin ftone from eight to 
ten inches thick, about twenty feet wide, forms. the upper 
part of this amphitheatre, over which the ftream precipi- 
tates. The whole front of this rock is made up from top 
to bottom, as well as from one extremity of the arch to 
the other, of a regular fucceffion, principally, of limeftone, 
ftrata over ftrata, and each ftratum or row, projecting in 
an horizontal direction a little further, out than its bafe, un- 
til it terminates into one entire flat, thin, extenfive piece, 
as already mentioned; and which jets out at right angles 
or 
