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Silurian Period , In geologic time , the Silurian Period, the third period of the Paleozoic Era , covers the time from roughly 440 million years ago (mya) until 410 my… Allosaurus , Jurassic Central period of the Mesozoic era, lasting from 213 to 144 million years ago. In this period there were saurischian and ornithischian dinos… Jurassic Period , In geologic time , the Jurassic Period—the middle of three geologic periods in the Mesozoic Era—spans the time from roughly 206–208 million years ago… Period , pe·ri·od / ˈpi(ə)rēəd/ • n. 1. a length or portion of time: he had long periods of depression the ale will be available for a limited period the peri… month , month / mən[unvoicedth]/ • n. (also calendar month) each of the twelve named periods into which a year is divided: the first six months of 1992 | it… Periodization , Periodization is an intellectual process that seeks to divide a continuous time interval into parts. Periodization is most frequently used in the soc…
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