. Geology and mineralogy considered with reference to natural theology. PL o7. Calcareous slateof fresh waterformation. Temporarydry land. Marineformation. Section of the Dirt-bed in the Isle of Portland, shewing the subterranean remainsof an ancient Forest. De la Beche. Fig. 4Tee£. Circular ridges and depressions on the Burrstone, in the I. of Portland, round an erectstump of a tree, four feet high. Sketched by Professor Henslow, 1832. Fig. 3. Lower Purbeck bedscomposed of calcare-ous slate of freshwaterformation.

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Keywords: ., bookcentury, booksubjectnaturaltheology, booksubjectpaleontology