EVOLUTIONARY AND ECOLOGIC SIGNIFICANCE OF OXYGEN-DEFICIENT MARINE BASINS
Article first published online: 9 OCT 2007
Volume 4, Issue 4, pages 413–428, October 1971
How to Cite
RHOADS, D. C. and MORSE, J. W. (1971), EVOLUTIONARY AND ECOLOGIC SIGNIFICANCE OF OXYGEN-DEFICIENT MARINE BASINS. Lethaia, 4: 413–428. doi: 10.1111/j.1502-3931.1971.tb01864.x
- Issue published online: 9 OCT 2007
- Article first published online: 9 OCT 2007
Benthic invertebrates living in low oxygen regions of the Black Sea, Gulf of California, and basins off Southern California form three major biofacies associated with the following concentrations of dissolved oxygen: (1) an azoic region (≤ 0.1 ml/1), (2) a low diversity, small, soft-bodied infauna (0.3–1.0 ml/1), and (3) a diverse calcareous fauna (2 1.0 ml/l). These biofacies recapitulate the chronologic appearance of Pre-Cambrian trace fossils followed by a diverse calcified fauna in the Cambrian.
The basin model has been used to reconstruct a Lower Cambrian oxygen level of 0.1 P.A.L. (present atmospheric level). This value is ten-fold that proposed in the Berkner-Marshall hypothesis.