paleozoic in A Sentence

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    Early Paleozoic climates were warmer than today, but the

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    Therefore, in the first half of the Paleozoic, large areas of the continents were below sea level.

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    The Ancient creature trilobite lived on our planet about 480 million years ago, in the so-called Paleozoic era.

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    The Paleozoic("old life") era was the first and longest era of the Phanerozoic eon, lasting from 542 to 251 Ma.

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    Sauropsida and Synapsida evolving from amphibians in the latter Paleozoic Era soon extended their living areas ashore though some returned to aquatic life.

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    During the Triassic period(245- 208 million years ago)- the first phase of the Mesozoic era that followed the Paleozoic- many“red-rock” deposits were laid down.

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    Deserts have probably never been so extensive on earth as they were during the Permian period, the last phase of the Paleozoic era, some 290 to 245 million years ago.

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    Early Paleozoic climates were warmer than today, but the end of the Ordovician saw a short ice age during which glaciers covered the south pole, where the huge continent Gondwana was situated.

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    Our new research shows that retroviruses are at least 450 million years old, if not older, and that they must have originated together with, if not before, their vertebrate hosts in the early Paleozoic era.

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    A recent study by the Geological Society of America shows that Spiti houses various unique and rare fossils of marine life(Trilobites, of the Paleozoic Era are some of the earliest legged creatures, relatives of crabs, centipedes and spiders).

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    The development of hard body parts such as shells, skeletons or exoskeletons in animals like molluscs, echinoderms, crinoids and arthropods(a well-known group of arthropods from the lower Paleozoic are the trilobites) made the preservation and fossilization of such life forms easier than those of their Proterozoic ancestors.

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