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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.
Brongniart, in 1849, as coming from the "Gres bigarre," or Bunter, not one is common to the Keuper. The footprints of Labyrinthodon observed in the clays of this formation at Hildburghausen, in Saxony, have already been mentioned.
The new red sandstone of Connecticut will also fill a gap in the history of fossil fishes, and this acquisition is so much the more important, because, at the epoch of the gres bigarre, a marked change took place in the anatomical character of fishes. It presents an intermediate type between the primitive fishes of the ancient deposits and the more regular forms of the jurassic deposits. Mr.
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