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The Cenozoic era comprises two divisions,-theTERTIARY period and the QUATERNARY period.
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These two ages are called the Mesozoic or Secondary, and the Cenozoic or Tertiary.
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Representatives of the foraminifer Nummulites are important in Earth history for timing Cenozoic shallow-water carbonates.
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The Cenozoic era had volcanic activity and geological unrest.
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Anna stood in the archway of the Gothic old building, motionless, like her Cenozoic comrades.
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The Cenozoicera comprises two divisions,-theTERTIARY period and the QUATERNARY period.
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The Cenozoicera had volcanic activity and geological unrest.
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In geologic time, the beds are a part of the Oligocene epoch of the Cenozoicera.
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The Mesozoic era has three periods, the Triassic, Jurassic and Cretaceous, while the Cenozoicera names five periods,-theEocene, Oligocene, Miocene, Pliocene and Pleistocene.
Usage of age of mammals in English
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At twenty-one minutes to midnight they vanish and the ageofmammals begins.
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Hence the Tertiary period may be called "the ageofmammals."
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Still higher, or more recent, are Cuvier and Brongniart's tertiary rocks, representing the ageofmammals.
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Then came the Caenozoic age , or ageofmammals, three million years, with strata thirty-one hundred feet thick.
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The ageofmammals awaited the deepening and the enrichment of the soil and the stability of the earth's crust.
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They were the dominant land animals of their time, just as the quadrupeds were during the AgeofMammals.
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We think we're at the end of the AgeofMammals, and well into the Age of Managing the Ecology.
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From between the feet of stomping dinosaurs, ratty animals scurry about; cue an asteroid impact and the AgeofMammals begins.
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Thus, since vertebrates appeared, we have in succession the Age of Fishes, the Age of Amphibians, the Age of Reptiles, and the AgeofMammals.