Abstract
Tests of phaeodarian radiolarians are composed largely of organic matter, containing only a small percentage of opaline silica in their matrix. Because of their highly organic nature, these tests are generally dissolved prior to deposition at the sediment-water interfaces of oxic environments. Anoxic environments, however, offer settings of little bioturbation and low oxygenation and may enhance phaeodarian preservation in the sediment records of anoxic locations. Recent southern California continental borderland surface sediment samples are studied in this research to provide a quantitative index of anoxia using phaeodarian surface area as a criterion. Californian Miocene and Pliocene samples have been compared to verify the index in the fossil record.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
