CHAPTER XVIII.

The Eocene period--Relations between the Kainozoic and Mesozoic rocks in Europe and in North America--Classification of the Tertiary deposits--The sequence and subdivisions of the Eocene rocks of Britain and France--Eocene strata of the United States--Life of the period--Plants--Foraminifera--Corals--Echinoderms--Mollusca--Fishes-- Reptiles--Birds--Mammals.