Ordovician period

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Related to Ordovician period: Permian period, Devonian period, Silurian period

Ordovician period

The second period in the Paleozoic era: 505 to 438 million years ago.

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Noun

Ordovician period - from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

Ordovician

Paleozoic, Paleozoic era - from 544 million to about 230 million years ago

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Many impact events have been confirmed during the Ordovician period when a meteorite struck the Baltoscandian shallow sea (e.g.

A siliciclastic shallow-marine turbidite on the carbonate shelf of the Ordovician Baltoscandian palaeobasin/Terrigeenne madalmere turbidiit Ordoviitsiumi Baltoskandia paleobasseini karbonaatsel selfil

While oxygen was just 14 percent of the air in the middle of the Ordovician period, in a space of about 10 million years it jumped dramatically; it constituted almost a quarter of the atmosphere in the late part of that period.

Earth's Animal Life Exploded When Oxygen Levels Increased

The Great Stone, Church A BLUE plaque in old Northfield village says: "This glacial erratic boulder was formed in an explosive volcanic eruption during the Ordovician period, 450 to 460 million years ago.

HIDDEN SECRETS REVEALED: BRUM'S

THE GREAT STONE, CHURCH ROAD, NORTHFIELD A blue plaque in old Northfield village says: "This glacial erratic boulder was formed in an explosive volcanic eruption during the Ordovician period, 450 to 460 million years ago.

HIDDEN SECRETS REVEALED: BRUM'S

This dataset place the Upper Quartzite unit in the Ordovician period.

Ordovician outcrops in the Hazara basin; constraints from the detrital Zircon U-Pb geochronology

Most of the limestone along our shoreline is from the Ordovician Period Trenton or Black River formations.

Stone stories--the rocks and pebbles of Lake Ontario's south shore

The Appalachian basin contains two layers of buried energy--Utica shale from the middle Ordovician period and Marcellus shale from Devonian yield gas from Pennsylvanian and surrounding area wells.

Growth from "Tight" places

Criptolithus & Eumorphocystis, Ordovician Period, 440-500mya

Imagining deep time: an exhibit at the National Academy of Sciences Building

The species dates back to the Ordovician period, some 450 million years ago.

Strange ally in the war against sepsis: 50 years ago this year, scientists first connected an ancient sea creature to testing for life-threatening bacteria

Ormo and his colleagues, who studied two craters called Lockne and Malingen, which lie about 16km apart in northern Sweden results, found that the Malingen was of same age as Lockne, about 458 million years old, confirming that the area was rocked by a double asteroid strike during the Ordovician Period.