Skip to Main Content
Skip Nav Destination

Bivalves first appeared in the Early Cambrian and were virtually cosmopolitan. These very small and insignificant molluscs were probably surface crawlers on the microbial mat floors of the Cambrian sea. They evolved little further in the Mid Cambrian and by the Late Cambrian had apparently disappeared from the fossil record. Their re-appearance in the Early Ordovician coincided with a major diversification in which all the principal bivalve clades evolved, but the class was confined to Gondwana; their habitat was now principally infaunal in siliciclastic sediments. In the Mid Ordovician a few forms reached Baltica and the eastern Laurentian margin,...

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Close Modal

or Create an Account

Close Modal
Close Modal