. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . in double and triple rows, fig. 16. The stigmaria is generally sup-posed to have been a large succulent water-plant—the stem, in itscompressed fossil state, varying from two to six inches in diameter,and has numerous processes, which proceed vertically, horizontally. CONIFERS. ANTHRACITE COAL FORMATION 131 and obliquely, and traverse the beds in every direction. These pro-cesses have been traced to a distance of eight or ton feet from thestem, and had a horizont
. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . in double and triple rows, fig. 16. The stigmaria is generally sup-posed to have been a large succulent water-plant—the stem, in itscompressed fossil state, varying from two to six inches in diameter,and has numerous processes, which proceed vertically, horizontally. CONIFERS. ANTHRACITE COAL FORMATION 131 and obliquely, and traverse the beds in every direction. These pro-cesses have been traced to a distance of eight or ton feet from thestem, and had a horizontal range of twenty feet. From the extra-ordinary number of these plants, it is concluded that they havefurnished the material for the great bulk of our coal beds. From the general character of the vegetation, and the absence ofthe great mountain ranges which now conspicuously mark the earthssurface, it is probable that water covered a far greater area of countrythan it subsequently did, while, at the same time, its mineral quali-ties must have been essentially different from what they are now.
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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources
