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Mesozoic era Mesozoic era
Mesozoic era [Gr.,=middle life], major division of geologic time (see Geologic Timescale , table) from 65 to 225 million years ago. Great crustal disturbances that marked the close of the Paleozoic and the beginning of the Mesozoic eras brought about drastic changes in the topography of North... Read more
Cenozoic era Cenozoic era
Cenozoic era , last major division of geologic time (see Geologic Timescale , table) lasting from 65 million years ago to the present. The Cenozoic is divided into the Tertiary (from 65 million years ago until 2 million years ago) and Quaternary (2 million years ago to the present) periods. Early... Read more
Geologic Timescale (table) Geologic Timescale (table)
Geologic Timescale Geologic Timescale Era Period Epoch Approximate duration (millions of years) Approximate number of years ago (millions of years)  Not an era but the time preceding the Cambrian. Cenozoic Quaternary Holocene 10,000 years ago to the present   ... Read more
ammonite ammonite
ammonite , one of a type of extinct marine cephalopod mollusk, related to the nautilus and resembling it in having an elaborately coiled and chambered shell. Unlike the interiors of nautilus shells, the chambers of ammonite shells display intricately shaped septa and sutures. The type included... Read more
Coelacanthiformes Coelacanthiformes
Coelacanthiformes (subclass Crossopterygii, superorder Coelacanthimorpha) An order of bony fish thought to have been extinct for 65 million years (since the end of the Mesozoic Era) until the discovery of the coelacanth Latimeria chalumnae off S. Africa in 1938 (see LATIMERIIDAE). Both fossil and... Read more
Potlatch Corp Potlatch Corp
Potlatch Corporation EARLY HISTORY GREAT DEPRESSION: CRISIS AND MERGER POSTWAR ERA: NEW PRODUCTS AND GEOGRAPHIC EXPANSION THE MADDEN ERA, 1971– Read more
Jabal Shammar Jabal Shammar
JABAL SHAMMAR A mountainous region in northwestern Saudi Arabia. Named for the Shammar tribal confederation, Jabal Shammar consists of the Aja Mountains, which are mainly granite; the basaltic Salma Mountains; the high sand dunes of al-Nafud; and scattered oases. A mixed economy of... Read more
Triassic period Triassic period
Triassic period , first period of the Mesozoic era of geologic time (see Geologic Timescale , table) from 205 to 250 million years ago. Throughout the Triassic, E North America, as a result of the mountain-building episode that formed the Appalachians in the late Paleozoic era , was elevated... Read more
Victorian Victorian
Victorian Art The Victorian era (1837 Read more
Cretaceous Cretaceous
Cretaceous The third and youngest system of Mesozoic rocks takes its name from the Latin creta, meaning chalk. The word Cretaceous first appeared in an early book on the geology of England by W. D. Conybeare and William Phillips in 1822. It was based on the term Terrain Cretacé which had... Read more

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