Maclure on the Arrangement and Origin of Rocks. 261% 
proper gray wacke in which class all the anthracite of the 
United States is found, and I believe in all other countries. 
If the immense:confusion from the derangement of the stra- 
ta would permit an accurate examination, it would, I be- 
lieve, be found that the dip of the anthracite on one side of 
the river is to the north and on the other side to the south, 
WwW is a new occurrence in regard to 
and seems to assimilate the anthracite to the bituminous 
coal basins; a fact which deserves to be ascertained. 
Art. VIII—Miscellaneous remarks on the systematic ar- 
rangement of rocks, and on their probable origin, cae 
cially of the secondary, by Witttam Macxure, Presi 
of the Am. Geol. Soc’y. in a letter dated Alicante in Spain, 
April 29, 1823, addressed to the Editor. 
Dear Sir, 
So much having lately aeemnica in 
works concerning the universality of the psi Io forma- 
tion (called by some diluvian;) the science having scarce- 
ly got rid of the innumerable hypothetical suppositions of 
the ori igin and formation of the earth, is I fear likely to 
stumble into another hypothesis, though not so far back 
into the dark annals of nature, yet sufficient to warp and 
confuse the collection of facts, on which must 
a —— theories. T'o elucidate by bcs 3 EB 
so regular and undisturbed, any pe or “ena re 
mation of the secondary, I shall here enregister my opinions 
as being the result of what Iknow. Ihave been induced 
to consider the two great aqueous depositions of alluvial 
and secondary, as having a common origin in the aggrega- 
tion of the detritus or particles. of more ancient rocks, re- 
duced to inace formsby te eae ey differing only in the 
lengt , and com- 
ne 0 the the diet tion or de- 
Ppesed of an Seanad drawn rom see far di 
That the depositions of gravel, : a or clay, formed by the 
sea, lakes, or rivers, or precipitations of from ee 
by its evaporation or cooling, should dbe similar, one Ww 
a reasonably expect as that the same cause 
