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Silurian Period

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Shawn Kirsch

on 10 March 2013

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Transcript of Silurian Period

The Silurian Period By Shawn Kirsch Time Animals of the Silurian Period Extinctions and Evolutions During this time there was a minor extinction linked to climatic events. In this extinction 60% of marine species were wiped out. Several new organisms evolved such as jawed and bony fish and moss like plants formed by water. Reefs formed creating a whole new ecosystem for marine life. Sea levels rose due to melting glaciers. Phylum Chlorophyta (Green Algae) Receptaculites Clade Chlorophyta (Vascular Plants) Cooksonia Phylum Porifera (Sponge) Chactetes Phylum Cnidaria (Coral, Jellyfish) Heliotites Phylum Anthropoda (Trilobite, insects) Encrincrus Phylum Bryozoa (Moss) Stictopora Phylum Brachiopoda (Lamp Shell) Platystrophia Phylum Mollusca (Squid) Orthoceras Phylum Hemichordata (Acorn Worms) Diplograptus Phylum Echinoderm (Sea Urchin) Urasterella Phylum Chordata (Hagfish) Pteraspis Where Did the Name Silurian Come From? Named by the English geologist Sir Roderick Murchison
He was studying rocks from this age and realized they were younger than the Cambrian and older than the Devonian
This period is named after the Silures, an ancient Celtic tribe that lived along the now Welsh-English border This period lasted from 416 mya to 444 mya
Overall it lasted 28 my
This was during the Paleozoic Era and the Phanerozoic Eon Important Geologic Events Gondwana drifted across the South Pole
At the end of this age Laurentia and Baltica collided forming Euramerica raising mountain ranges
Rising sea level formed a nearly continuous sea from New York to Nevada
Other shallow seas covered parts of other continents
The Equator was in North America Climate In the early Silurian period high altitudes were covered by ice sheets
Later the climate warmed globally
A greenhouse phase later began, melting ice sheets and raising sea levels Rocks and Minerals In the mid-US precipitation of limestone, dolomite, gypsum and halite from ocean water was occuring
Shale and sandstone formed from the Taconic Mountain Erosion
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