A 'tag-team' between the oceans and continents millions of years ago devastated marine life and altered the course of evolution on Earth, according to a new study. Scientists say a string of severe environmental crises which happened between 185 and 85 million years ago triggered mass extinctions among ocean-living species.
A 'tag-team' between the oceans and continents millions of years ago devastated marine life and altered the course of evolution on Earth, according to a new study. Scientists say a string of severe environmental crises which happened between 185 and 85 million years ago triggered mass extinctions among ocean-living species.
This chapter of Earth's history is often dubbed the age of the dinosaurs, said Prof Gernon, and is famously exposed along the Jurassic Coast on the UK's south coast as well as along the cliffs of Whitby in Yorkshire and Eastbourne in East Sussex. "Crucially, we found evidence of multiple pulses of chemical weathering on both the seafloor and continents, which alternately disrupted the oceans.Experts from the universities found the timing of these weathering pulses matched up with most oceanic anoxic events in the rock record.
He added:"This process eventually caused swathes of the oceans to become anoxic, or oxygen-depleted, creating 'dead zones' where most marine life perished. The team of researchers xplained how present-day human activities have reduced mean oceanic oxygen levels by about two per cent -- leading to a significant expanse in anoxic water masses.
Nature Fish Oceanography Earth Science Geology Origin Of Life Fossils Early Climate
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