Geological Reports. 193 



into the Cumberland valley on the other j comprising an area of six 

 thousand square miles. 



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= 

 ranee 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 

 Charles T. Jackson, M. D., &;c. Stc, 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. xiv. and xv.) a memoir on the Geology of Nova 

 Scotia, Sec. with a map. This memoir was afterwards, in conse- 

 quence of another visit to Nova Scotia, revised and enlarged, and 

 published wi\h graphic illustrations in the Transactions of the Boston 

 Academy ; for a notice of it see Vol. xxii. 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 dismiss 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. Every where it has alluvial and 



Vol. XXXII.— No. 1. 25 



