Ammonite morphotypes as indicators of oxygenation in a Cretaceous epicontinental sea
Article first published online: 9 OCT 2007
Volume 26, Issue 1, pages 49–63, March 1993
How to Cite
BATT, R. (1993), Ammonite morphotypes as indicators of oxygenation in a Cretaceous epicontinental sea. Lethaia, 26: 49–63. doi: 10.1111/j.1502-3931.1993.tb01511.x
- Issue published online: 9 OCT 2007
- Article first published online: 9 OCT 2007
- received 2nd December, 1991; revised manuscript received 1st June, 1992.
An examination of ammonite morphotypes through stratigraphic sections of the Greenhorn Cyclothem of the Cretaceous Western Interior suggests that they may be useful indicators of oxygenation within ancient epicontinental seas. Because some morphotypes appear to reflect a nektobenthic and others a pelagic habitat, the presence of specific morphotypes may be used to indicate benthic and water-column oxygenation, respectively. At the same time, their absence may provide a valuable indicator of dysaerobic to anaerobic conditions that may have promoted the development of petroleum source rocks. □Ammonites, anoxia, Cretaceous, Greenhorn Cyclothem, western Interior.