Oceanic Anoxic Event at the Cenomanian–Turonian boundary interval (OAE-2): ichnological approach from the Betic Cordillera, southern Spain
Article first published online: 23 MAR 2009
© 2009 The Authors, Journal compilation © 2009 The Lethaia Foundation
Volume 42, Issue 4, pages 407–417, December 2009
How to Cite
RODRÍGUEZ-TOVAR, F. J., UCHMAN, A. and MARTÍN-ALGARRA, A. (2009), Oceanic Anoxic Event at the Cenomanian–Turonian boundary interval (OAE-2): ichnological approach from the Betic Cordillera, southern Spain. Lethaia, 42: 407–417. doi: 10.1111/j.1502-3931.2009.00159.x
- Issue published online: 10 NOV 2009
- Article first published online: 23 MAR 2009
- Manuscript received on 15/11/2007; manuscript accepted on 29/09/2008.
- Betic Cordillera;
- Oceanic Anoxic Event;
- Trace Fossil
Ichnological analysis of dark sediments of the Oceanic Anoxic Event at the Cenomanian–Turonian boundary interval (OAE-2) from the Betic Cordillera, southern Spain, reveals the presence of ichnofabrics containing trace fossils Chondrites isp., Palaeophycus heberti, Planolites isp., Thalassinoides isp., Trichichnus linearis, Zoophycos isp., and other bioturbational structures. Analysis of the ichnofabrics and trace fossil diversity allowed the reconstruction of relative oxygenation. Before the OAE-2, oxygenation of sediments was generally good, but it was punctuated by short anoxic events. During the OAE-2i, several longer anoxic intervals were interrupted by shorter dysaerobic and oxic periods. After the OAE-2, oxygenation improved and almost all trace fossils known before OAE-2 reappeared, although oxygenation dropped a few times to anoxia. Generally, the short oxygenation changes reveal a periodicity, which may suggest a Milankovitch control.