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European stage of the Upper Cretaceous, spanning the time between 72 and 66 million years ago.
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A fossil that is large enough to be studied without a microscope.
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An era of geologic time between the Paleozoic and the Cenozoic, spanning the time between 248 and 65 million years ago. The word Mesozoic is from Greek and means "middle life."
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A fossil so small that it must be studied with a microscope.
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A unit of measure. There are one million micrometers in one meter.
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A epoch of the upper Tertiary period, spanning the time between 23.8 and 5.3 million years ago. It is named after the Greek words "meion" (less) and "ceno" (new).
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A period of the Paleozoic era, spanning the time between 360 and 325 million years ago. It is named after the Mississippi River valley, which contains good exposures of rocks of this age.
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The study of form and structure of animals and plants and their fossil remains.
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