‘A bad time to be alive’: Mass extinction 444 million years ago linked to loss of oxygen in Earth’s oceans

The first major mass extinction in Earth’s history was linked to a severe and prolonged lack of oxygen in the oceans, according to a new study which could help scientists understand modern climate change. Some 85 per cent of all species perished during the Late Ordovician die-off about 444 million years ago – a time when the vast majority of life was marine-based and most of

Sourced through Scoop.it from: www.independent.co.uk