- Fossil echinoderms as monitor of the Mg/Ca ratio of Phanerozoic oceansJ A D Dickson
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
Science 298:1222-4. 2002..3, whereas echinoderms from the Jurassic to the Cretaceous indicate a Mg/Ca of approximately 1.4. The present seawater Mg/Ca is approximately 5...
- Proterozoic modular biomineralized metazoan from the Nama Group, NamibiaRachel A Wood
Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge CB2 OEL, UK
Science 296:2383-6. 2002..This finding implies that large, modular metazoans with biologically controlled mineralization appeared some 15 million years earlier than previously documented...