Geological Reports. - 193 
into the Cumberland valley on the other ; comprising an area of ‘six 
thousand square miles. 7 
In the Appalachian region, useful substances abound, although they 
are limited in number. Coal and iron ore, of several species, are 
found, and in inexhaustible quantities ; limestone, marl, sandstone and 
conglomerates, also abound. No metal more precious than iron is 
found in any considerable quantity. 
Although the strata are enormously contorted and broken, having 
evidently been subjected to great violence, there are no igneous 
rocks—no dykes of trap or porphyry, and no veins of quartz. We 
are compelled to omit the detailed description of the strata. 
It is expected. that the survey and all its attendant labors will oc- 
cupy five years. This luminous preliminary report gives good assu- 
rance that the task will be ably performed, and that much good will 
result—while there is every reason to believe that the State of Penn- 
sylvania will continue to afford all requisite appropriations. 
VII. First Report of the Geology of the State of Maine; by 
Cuarues T. Jackson, M. D., &c. &c., and Geologist to the State 
of Maine. pp. 128, with an Atlas, containing twenty four plates. 
This report came to hand at the last moment of the present num- 
ber, but exhausted as are both our time and space, we cannot omit 
to say that it is a performance possessing the highest order of merit. 
Some years ago, Dr. Jackson and his friend Mr. Alger published in 
this Journal, (Vols. xrv. and xv.) a memoir on the Geology of Nova 
otia, &c. witha map. ‘This memoir was afterwards, in conse- 
quence of another visit to Nova Scotia, revised and enlarged, and 
published with graphic illustrations in the Transactions of the Boston 
Academy ; for a notice of it see Vol. xxi. p. 167, of this Journal. 
We there presented this memoir, as a model in its kind. It has cer- 
tainly not been surpassed, by any similar effort in this country before 
that whose title is given above. 
The present sketch of parts of Maine is a masterly production, 
and is well worthy of an analysis, both on account of the ability with 
which it is executed, and of the interesting facts which it announces. 
This analysis is, however, at this time, entirely out of our power, but 
we cannot disiniss the subject without a few brief remarks. 
Maine is a country chiefly of primary rocks—with a large division 
of those of transition, and towards New Brunswick it has an impor- 
tant region of the lower secondary. Fivery where it has alluvial and 
Vou. XXXII.—No. 1. 25 
