Extinction (optical mineralogy)

Devonian

Structural basin

Geology

Ozone depletion

Sociology

Carboniferous

Demography

Paleontology

Glacial period

Stratosphere

Late Devonian extinction

Earth science

Population

Extinction event

Environmental science

Biological dispersal

Atmospheric sciences

Science Advances

There is an unexplained terrestrial mass extinction at the Devonian-Carboniferous boundary (359 million years ago). The discovery in east Greenland of malformed land plant spores demonstrates that the extinction was coincident with elevated UV-B radiation demonstrating ozone layer reduction. Mercury data through the extinction level prove that, unlike other mass extinctions, there were no planetary scale volcanic eruptions. Importantly, the Devonian-Carboniferous boundary terrestrial mass extinction was coincident with a major climatic warming that ended the intense final glacial cycle of the latest Devonian ice age. A mechanism for ozone layer reduction during rapid warming is increased convective transport of ClO. Hence, ozone loss during rapid warming is an inherent Earth system process with the unavoidable conclusion that we should be alert for such an eventuality in the future warming world.

UV-B radiation was the Devonian-Carboniferous boundary terrestrial extinction kill mechanism