Cretaceous Sediment Formation (image) Helmholtz Centre for Ocean Research Kiel (GEOMAR) Share Print E-Mail Caption Cretaceous sediments in Tarfaya, Morocco. They document one of the two major anoxic events about 90 Mio. years ago. Credit W. Kuhnt, Kiel University Usage Restrictions only in the context of this press release Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.