14 Facts About Ordovician


Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era.

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Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in North Wales in the Cambrian and Silurian systems, respectively.

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The Ordovician received international approval in 1960, when it was adopted as an official period of the Paleozoic Era by the International Geological Congress.

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The corresponding rocks of the Ordovician System are referred to as coming from the Lower, Middle, or Upper part of the column.

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Ordovician meteor event is a proposed shower of meteors that occurred during the Middle Ordovician Epoch, about 467.

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Ordovician was a time of calcite sea geochemistry in which low-magnesium calcite was the primary inorganic marine precipitate of calcium carbonate.

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Early Ordovician climate was very hot, with intense greenhouse conditions giving way to a more temperate climate in the Middle Ordovician.

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The Ordovician saw the highest sea levels of the Paleozoic, and the low relief of the continents led to many shelf deposits being formed under hundreds of metres of water.

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The sea level rose more or less continuously throughout the Early Ordovician, leveling off somewhat during the middle of the period.

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Ordovician geography had its effect on the diversity of fauna.

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In North America and Europe, the Ordovician was a time of shallow continental seas rich in life.

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Trilobites in the Ordovician were very different from their predecessors in the Cambrian.

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Ordovician came to a close in a series of extinction events that, taken together, comprise the second largest of the five major extinction events in Earth's history in terms of percentage of genera that became extinct.

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Recent work considering the sequence stratigraphy of the Late Ordovician argues that the mass extinction was a single protracted episode lasting several hundred thousand years, with abrupt changes in water depth and sedimentation rate producing two pulses of last occurrences of species.

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