CHAPTER XV.
UPPER EOCENE FORMATIONS.
Eocene areas in England and France--Tabular view of French Eocene strata--Upper Eocene group of the Paris basin--Same beds in Belgium and at Berlin--Mayence tertiary strata--Freshwater upper Eocene of Central France--Series of geographical changes since the land emerged in Auvergne--Mineral character an uncertain test of age--Marls containing Cypris--Oolite of Eocene period--Indusial limestone and its origin--Fossil mammalia of the upper Eocene strata in Auvergne--Freshwater strata of the Cantal, calcareous and siliceous--Its resemblance to chalk--Proofs of gradual deposition of strata 174