X 
THE GEOLOGIST. 
draw any inferences as yet, but, as in the preceding case, we 
annex a list of the essays pubhshed in this present volmne 
bearing up on this question. 
1. Green on the Lignite of Bacton, p. 12. 
2. Binney on the fossil fishes of the Manchester coal-field, 
p. 15. 
3. Prof. Rogers on the age of the Coal Rocks of Eastern 
Virginia, p. 38. 
4. M. Mandre onthe peat formation of the Moselle, p. 45. 
5. Dr. Black on the submerged forests of Great Britain, p. 174. 
American Geology. — Various causes have led to the growing 
interest on this subject ; the memoirs of Professor Rogers and 
Mr. Logan, already alluded to — the publication of official reports 
on the geology of several of the states — the recent visit of Mr. 
Lyell to those shores, all these have raised the subject into more 
than comparitive importance, and the record of the past two years 
indicates a considerable progress in our knowledge. The appa- 
lachian chain, the object of investigation of the Messrs. Rogers, 
is composed of palseozoic deposits conformable to each other, 
and which have been identified with Silurian, Devonian and 
Carboniferous deposits.* 
Extending from north-east to south-west, the older rocks of 
the Appalachian chain (the total length of which is 1200 miles, 
with an average width of 100 miles,) have been thrown into a 
number of anticlinal ridges, and synclinal vallies from 100 to 150 
miles in length, and all more or less parallel to each other, but 
with certain deviations from rectilinear to ciu-ved directions; 
describing many of these, the Professors Rogers show, that as 
the folds approach to the south-east, where igneous and crystal- 
line rocks occur, convolutions are much more rapid, accompanied 
by many brakes and by complete invasions of the beds. This 
latter phenomena is identified with that which has been recog- 
* Vide Murchison's address 1843. p. 118. 
