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Miocene epoch
(Encyclopedia) Miocene epochMiocene epochmīˈəsēn [key], fourth epoch of the Tertiary period in the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), lasting from…mastodon
(Encyclopedia) mastodonmastodonmăsˈtədŏnˌ [key], name for a number of prehistoric mammals of the extinct genus Mammut, from which modern elephants are believed to have developed. The earliest known…Pliocene epoch
(Encyclopedia) Pliocene epochPliocene epochplīˈəsēn [key], fifth epoch of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 5.1 to 2 million years ago.…Dinotherium
(Encyclopedia) DinotheriumDinotheriumdīnəthērˈēəm [key] [Gr.,=terrible beast], extinct mammal related to the elephant, fossil remains of which have been found in Miocene and Pliocene formations of…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,…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…Table of Geological Periods
It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud, but there is no way of estimating the length of this process. Our Earth acquired its present size…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…Geology of the Grand Canyon: Base Levels Of Erosion.
BASE LEVELS OF EROSION.In his popular narrative of Explorations of the Colorado River, Powell has employed the above term to give precision to an idea which is of much importance in physical…Geology of the Grand Canyon: Chapter I. The Plateau Province.
CHAPTER II. GEOGRAPHY OF THE G...CHAPTER I. THE PLATEAU PROVINCE.The investigations made by this division of the Geological Survey during the last two years have been pursued with the object…Trending
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