During this extinction event, which may have been composed of several distinct closely spaced events, there were several marked changes in biologically responsive carbon and oxygen isotopes, which may indicate separate events or particular phases within one event.
There were several marked changes in biologically responsive carbon. This was during this extinction event. There were several marked changes in oxygen isotopes. This was during this extinction event. Biologically responsive carbon may indicate separate events or particular phases within one event. Oxygen isotopes may indicate separate events or particular phases within one event. This extinction event may have been composed of several distinct closely spaced events.