Ordovician


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Related to Ordovician: Permian

Ordovician

of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished

Ordovician

[‚ȯrd·ə′vish·ən]
(geology)
The second period of the Paleozoic era, above the Cambrian and below the Silurian, from approximately 500 million to 440 million years ago.
References in periodicals archive ?
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.
The warm and humid Ordovician climate provided favorable conditions for carbonate deposition on the Tarim Plate, which was situated at 20[degrees]S (Fang et al.
Well-drilling exploration has revealed the absence of the Middle Ordovician Yijianfang and Upper Ordovician Tumuxiuke formations in the central Tarim uplift between the Mid-Lower Ordovician Yingshan and the Upper Ordovician Lianglitage formations of the Bachu uplift (Yang et al., 2011).
(2013), the Pochico Formation probably corresponds to the Dapingian sequence sensu lato in the southern part of the Central-Iberian Zone in Spain, being in this case the Middle Ordovician in age (Bergstrom et al., 2009).
Single kukersite seams are found in the Lower Ordovician Kunda Stage.
"We have found that the Late Ordovician mass extinction most likely represents a real pulse of extinction-that many living things genuinely went extinct then," said Finnegan.
Here is the picture the researchers have assembled: 460,000,000 years ago, during the Ordovician, volcanoes along the margin of what is now the Atlantic Ocean spewed massive amounts of carbon dioxide into the atmosphere, turning the world into a hothouse.
Beginning in the Late Cambrian--Early Ordovician, several terranes located along the northern margin of Gondwana drifted from that margin, and subsequently accreted to other continents (e.g.
I assume therefore that I am a half black, Ordovician Celtic Welshman.
Invertebrate Paleontology Exciting new fossil discoveries in 445-million-year-old (Late Ordovician age) rocks in central and northern Manitoba are the focus of Dave Rudkin's research.

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