Before revision: Eruption history A number of dates ranging from 41 to 35 million years ago have been obtained on dredged samples from the seamounts on the basis of argon-argon dating , but at Discovery Seamount it may have continued until 7-6.5 million years ago .
After revision: Eruption history A number of dates ranging from 41 to 35 million years ago have been obtained on dredged samples from the seamounts on the basis of argon-argon dating .