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Unformatted text preview: Mesozoic. These bivalves, specifically the rudistids (Figure 7), began to play a larger role in reef formation. Rudistid reefs are so named because the rudistid bivalves were the dominant reef-forming organisms. Biodiversity was reduced by mass extinctions at the end of the Triassic and Jurassic periods of the mesozoic era. . The bivalves recovered from the Jurassic extinctions and again became major reef-formers in the numerous shallow marginal seas that encroached onto the continents during the Cretaceous, as shown by Figure 8....
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- Fall '10