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Cretaceous Rudist Bivalve and coral reefs

Drill core at the University of Texas - Austin showing Cretaeceous reef facies and fossils from a depth of over 10,000 feet.
Drill core at the University of Texas - Austin showing Cretaeceous reef facies and fossils from a depth of over 10,000 feet.
Dominant reef organisms during the Cretaceous included Rudist Bivalves.