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Nicholson, Henry Alleyne, 1844-1899

"æontological Science"

Among the fossils, Brachiopoda
1. Koessen beds. | very numerous; some few species common
(Synonyms, Upper | to the genuine Lias; many peculiar.
St Cassian beds of < _Avicula contorta, Pecten Valoniensis_,
Escher and Merian.) | _Cardium Rhoeticum, Avicula_
| _inoequivalvis, Spirifer Muensteri_,
| Dav. Strata containing 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.


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