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Eocene epoch

(Encyclopedia) Eocene epochEocene epochēˈəsēnˌ [key], second epoch of the Tertiary period in the Cenozoic era of geologic time, from approximately 54.9 to 38 million years ago. The Eocene in North…

Geology of the Grand Canyon: The Eocene.

THE CRETACEOUS.THE EOCENE.The foreground of the picture is full of strength and animation. At our feet is the brink of a precipice where the profiles descend 800 feet upon rugged sloped…

Tertiary period

(Encyclopedia) Tertiary periodTertiary periodtûrˈshēĕrˌē [key], name for the major portion of the Cenozoic era, the most recent of the geologic eras (see Geologic Timescale, tablegeologic timescale,…

Oligocene epoch

(Encyclopedia) Oligocene epochOligocene epochŏlˈəgōsēnˌ [key], third epoch of the Tertiary period in the Cenozoic era of geologic time, lasting from 38 to 24 million years ago. More of North America…

Geology of the Grand Canyon: The Cretaceous.

THE EOCENE.THE JURASSIC.THE CRETACEOUS.The platform immediately below the Pink Cliffs is picturesque rather than grand. Rough rolling ridges of yellow sandstone, long sloping hillsides and…

Lyell, Sir Charles

(Encyclopedia) Lyell, Sir CharlesLyell, Sir Charleslīˈəl [key], 1797–1875, British geologist. After studying and briefly practicing law, he spent most of his life in travel and in popularizing…

Geologic Timescale (table)

(Encyclopedia) Geologic Timescale Era Period Epoch Approximate duration (millions of years) Approximate number of years ago (millions of years) Cenozoic Quaternary Holocene 10,000 years ago to…