EARLY PALEOZOIC

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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Cratonic Sequences of North American
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Queenston Clastic Wedge
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Millburg Volcanic Ashes - Pennsylvania
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Subduction initiated on west coast NA Greywackes
and volcanics accumulate
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Other Tectonic Events Ouachita Trough
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Other Tectonic Events Williston Basin
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Other Tectonic Events Williston Basin
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Other Tectonic Events Williston Basin
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Other Tectonic Events Williston Basin
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
Other Tectonic Events Williston
Basin Evaporites Red River Formation
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOGEOGRAPHY
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOCLIMATE
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOCLIMATE
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOCLIMATE
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EARLY PALEOZOIC EVENTS
ORDOVICIAN PALEOCLIMATE
From the Early to Middle Ordovician, the earth
experienced a milder climate in which the
weather was warm and the atmosphere contained a
lot of moisture. However, when Gondwana finally
settled on the South Pole during the Late
Ordovician, massive glaciers formed causing
shallow seas to drain and sea levels to drop.
This likely caused the mass extinctions that
characterize the end of the Ordovician, in which
60 of all marine invertebrate genera and 25 of
all families went extinct.