EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Cratonic Sequences of North American.

EARLY PALEOZOIC EVENTS

ORDOVICIAN PALEOGEOGRAPHY

Cratonic Sequences ofNorth American

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Queenston ClasticWedge

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Millburg Volcanic Ashes - Pennsylvania

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Subduction initiated on west coast NAGreywackes and volcanics accumulate

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Other Tectonic EventsOuachita Trough

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Other Tectonic EventsWilliston Basin

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Other Tectonic EventsWilliston Basin

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHYOther Tectonic EventsWilliston Basin

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Other Tectonic EventsWilliston Basin

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

Other Tectonic EventsWilliston Basin

Evaporites

Red River Formation

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOGEOGRAPHY

EARLY PALEOZOIC EVENTS

ORDOVICIAN PALEOCLIMATE

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOCLIMATE

EARLY PALEOZOIC EVENTSORDOVICIAN PALEOCLIMATE

EARLY PALEOZOIC EVENTSORDOVICIAN 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.