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Bunter-sandstein: Gres bigarre: Sandstone and quartzose conglomerate. Equisetites columnaris. The first of these, or the Keuper, underlying the beds before described as Rhaetic, attains in Wurtemberg a thickness of about 1000 feet. It is divided by Alberti into sandstone, gypsum, and carbonaceous clay-slate.

Beds of Passage between the Lias and Trias, Rhaetic Beds. Triassic Mammifer. Triple Division of the Trias. Keuper, or Upper Trias of England. Reptiles of the Upper Trias. Foot-prints in the Bunter formation in England. Dolomitic Conglomerate of Bristol. Origin of Red Sandstone and Rock-salt. Precipitation of Salt from inland Lakes and Lagoons. Trias of Germany. Keuper. St.

The Quantocks, Brendons, and Exmoor consist of older rocks than the Mendips, belonging as they do to the Devonshire series of old red sandstones. Bordering the Brendons are found the red marls of the Permian series; whilst between Dunster and Williton, and along the base of the Quantocks, in the neighbourhood of Taunton Dean, as well as in some other localities, Keuper and Rhaetic beds occur.

Gumbel has applied the name of Rhaetic. They have also long been known as the Koessen beds in Germany, and may be regarded as beds of passage between the Lias and Trias. They are named the Penarth beds by the Government surveyors of Great Britain, from Penarth, near Cardiff, in Glamorganshire, where they sometimes attain a thickness of fifty feet. Cardium rhaeticum, Merrian. Natural size.

Out of this central plain rise several isolated, cone-like hills, the most notable being Glastonbury Tor and Brent Knoll. These belong to the lias and lower oolite rocks. The Poldens consist of lias; and the same formation constitutes the rising ground that bounds the plain on the S. and E. of the county. The southern side of the Poldens is edged with Rhaetic beds, which also extend to High Ham.