The Ordovician World

The Ordovician World - The Ordovician World The Ordovician...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The Ordovician World The Ordovician was a time of flooding of the continents with shallow seas. Organic reefs were abundant in middle to tropical paleolatitudes. By the end of th Ordovician most of the landmasses were close to or joined to Gondwana, which at bthat time was centered around the south pole. The late Ordovician also saw the spread of major glaciers in Gondwana, and the environmental conseqwuences that accompany that spread: sea-level falling, changes in oceanic circulation, cooling of the climate and restriction of the tropical belts. North America at this time was still astride the equator.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The Ordovician Mass Extinction The end of the Ordovicianperiod saw another mass extinction, accounting for the second most severe loss of marine species during the Phanerozoic. This mass extinction saw the loss of one third of all brachiopod and bryozoans, and the loss of groups of conodonts, trilobites, and graptolites. The falling sea-levels caused by the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

Page1 / 4

The Ordovician World - The Ordovician World The Ordovician...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online