g the above fossils
| alternate with the Dachstein beds, lying
\ next below.

/ White or greyish limestone, often in beds
| three or four feet thick. Total thickness
| of the formation above 2000 feet. Upper
| part fossiliferous, with some strata
2. Dachstein beds. < composed of corals (_Lithodendron_.)
| Lower portion without fossils. Among the
| characteristic shells are _Hemicardium_
| _Wulfeni, Megalodon triqueler_, and
\ other large bivalves.

/ Red, pink, or white marbles, from 800 to
| 1000 feet in thickness, containing more
| than 800 species of marine fossils, for
3. Hallstadt beds | the most part mollusca. Many species of
(or St Cassian). < _Orthoceras_. True _Ammonites_,
| besides _Ceratites_ and
| _Goniatites, Belemnites_ (rare),
| _Porcellia, Pleurotomania, Trochus_,
\ _Monotis salinaria_, &c.

/ A. Black and grey \ Among the fossils
4. A. Guttenstein beds. | limestone 150 feet | are _Ceratites_
B. Werfen beds, base | thick, alternating | _cassianus_,
of Upper Trias? | with the underlying | _Myacites_
Lower Trias of < Werfen beds. > _fassaensis_,
some geologists. | B. Red and green | _Naticella_
| shale and sandstone, | _costata_, &c.
\ with salt and gypsum./

In the United States, rocks of Triassic age occur in several
areas between the Appalachians and the Atlantic seaboard; but
they show no such triple division as in Germany, and their exact
place in the system is uncertain. The rocks of these areas consist
of red sandstones, sometimes shaly or conglomeratic, occasionally
with beds of impure limestone. Other more extensive areas where
Triassic rocks appear at the surface, are found west of the
Mississippi, on the slopes of the Rocky Mountains, where the
beds consist of sandstones and gypsiferous marls. The American
Trias is chiefly remarkable for having yielded the remains of a
small Marsupial (_Dromatherium_), and numerous foot