How is an index fossil useful to geologists in establishing the age of the rock layer in which they find it?
September 11, 2021What was Andrija Mohorovicic’s major contribution to geology?
September 11, 2021
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The first true vertebrates evolved about this time.
The first vertebrates (our ancestors) evolved during the Ordovician period. This time period is also known as the first time arthropods (insects) and plants probably colonized the land – for the first 3.5 billion years or so of life’s evolution, marine environments were the sole place where life thrived.
http://www.ucmp.berkeley.edu/ordovician/ordovician.php
The end of the Ordovician is marked by a mass extinction event that killed off many marine organisms. This was probably brought on by a massive volcanic eruption that pumped huge amounts of CO2 into and in so doing, tripped off a global warming event.
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