Sections exhibiting the silicified remains of Coniferæ and Cycadeæ, in their native bed, between the Portland and Purbeck stone, on the coast of Dorsetshire.

Fig. l. Appearance of trunks and roots of large Coniferous trees, and of trunks of Cycadites, in the black earth, which formed the soil of an ancient Forest in the Isle of Portland. (De la Beche.)

Fig. 2. Remarkable concentric Ridges of Stone, around the erect stump of a Fossil Tree in the Isle of Portland. See V. I. p. 495. Note. (Henslow.)

Fig 3. Inclined position of the petrified stumps of large Coniferæ, and of the bed of black mould and pebbles in which they grew, near Lulworth Cove, on the Coast of Dorset. (Buckland.)