The evolutionary history of the rudists involved successive radiation punctuated by episodic extinctions, which closely link with the widespread demise of carbonate platforms. The first three extinctions (mid-Valanginian, mid-Aptian and at the end of the Cenomanian) co-incided with oceanic anoxic events (OAE). NO OAE accompanied the four extinction, though several lines of evidence point to climatic cooling then. Here, we focus on the Barremian-Aptian and Cenomanian-Turonian intervals and would be concentrate on Iberia. For the Aptian, locations are: Organyà, in the southern Central Pyrenees, Benicàssin-Oropesa, in the Maestrazgo Basin and the Bilbao-Sur section, in the Vasco-Cantabric Basin. For the Cenomanian-Turonian, locations are: Sopeira, in the southern Central Pyrenees, and Valderejo Natural Park (Álava), in the Vasco-Cantabric Basin. (...) An alternative hypothesis is that an aspect of palaeoecology appears more fruitful as a posible factor -the preferred biotopes of the taxa. This correlation of the pattern of extinctions with the preferred biotopes of the rudists, could also explain the apparent link between the extinctions and shell mineralogy. Identifying the rudist taxa associated with a spectrum of external to internal platform biotopes across those intervals, vis-à-vis their palaeoautecology and shell mineralogy, can provide some constraints on the possible causal factors.
|Effective start/end date||1/10/06 → 30/09/09|
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