Sedimentary, My Dear Watson

A 21-year-old geology (and Spanish and history) undergrad who loves rocks and wants other people to love them too! Here you'll find a diverse collection of all things geo and natural history related, targeted at varying levels of expertise.

*Please feel free to send in geo-related questions to the ASK page!*

END-ORDOVICIAN (440 Ma)
Severity: 2nd worst
Cause: Some type of C cycle disturbance, not well constrained
Climate: Abrupt ice age followed by rapid warming
Aftermath: Cambrian organisms (e.g. trilobites) decimated
During the End-Ordovician mass extinction, 25% of known marine families and 60% of marine genera were wiped out. Warm-water invertebrates were the hardest hit, as the event was likely caused by a severe cooling event in the world’s oceans triggered by Gondwanan glaciation.However, as with just about all of the mass extinctions, other causes have been offered, such as a gamma ray burst and volcanism and weathering. 
Click HERE to see all Mass Extinction Monday posts

END-ORDOVICIAN (440 Ma)

Severity: 2nd worst

Cause: Some type of C cycle disturbance, not well constrained

Climate: Abrupt ice age followed by rapid warming

Aftermath: Cambrian organisms (e.g. trilobites) decimated

During the End-Ordovician mass extinction, 25% of known marine families and 60% of marine genera were wiped out. Warm-water invertebrates were the hardest hit, as the event was likely caused by a severe cooling event in the world’s oceans triggered by Gondwanan glaciation.However, as with just about all of the mass extinctions, other causes have been offered, such as a gamma ray burst and volcanism and weathering

Click HERE to see all Mass Extinction Monday posts

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    END-ORDOVICIAN (440 Ma) 2nd worst Some type of C cycle disturbance, not well constrained Abrupt ice age followed by...
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