The pictorial sketch-book of Pennsylvania : or, its scenery, internal improvements, resources, and agriculture, popularly described . FIG. 1.—NEUROPTERIS. nerve fern, which are plentifully distributed in the coal. Figure 2 is aspecimen of the odontopteris, or tooth-fern, not so numerous as theformer, but still characteristic of this formation. The next, Anom-opteris, are seldom met with, but nevertheless flourished in this era. ANTHRACITE COAL FORMATION 125.

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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources