Summary: and it took several more millions of years before this ocean surface dysoxia began to dissipate (Map from Wignall and Twitchett, 2002): Anoxia lasted longer in the deep ocean (Isozaki, 1994; Isozaki, 1997), apparently ending first in the equatorial Tethys, then the Neo-Tethys (the ocean being created as the Cimmerian
Image Dimensions: 525 x 333
Image originally found here.