There is nothing, then, in what is known of the older Eocene mammals of the Arctogaeal province to forbid the supposition that they stood in an ancestral relation to those of the Calcaire Grossier and the Gypsum of the Paris basin, and that our present fauna, therefore, is directly derived from that which already existed in Arctogaea at the commencement of the Tertiary period.

PLÂTRE, m., pierre calcaire, cuite et réduite en poudre.

2. Des terrains intermediaires coquilliers, formes du grauwacke-schistoide, et de pierre calcaire.

The following description given by the French naturalists of the rocks at Bernier's Islands, was probably taken from a large suite of specimens; and M. Peron states (1 page 204) that it is strictly applicable to all the adjacent parts of the continent, and of the islands that were examined by the French voyagers: Le sable du rivage (de l'ile Bernier) est quartzeux, mele d'une grande proportion de debris calcaires fortement attenues.

La substance de l'ile meme se compose, dans ses couches inferieures, d'un gres calcaire coquillier, tantot blanchatre, tantot rougeatre, depose par couches horizontales, dont l'epaisseur varie de 2 a 8 decimetres (7 a 11 pouces) et qui toutes etant tres uniformes dans leur prolongement, pourroient offrir a la maconnerie des pierres de construction naturellement taillees.

Ce sont des galets calcaires, agreges dans une terre sablonneuse ocracee, qui leur est tellement adherente, qu'on ne sauroit detruire cette espece de gangue sans les briser eux memes.