Abstract
The biogeographic patterns of Cambrian bradoriids, like those of ostracods, trilobites and other benthic forms, are controlled chiefly by temperature-latitude gradients and geographic barriers. Early Cambrian biogeography is now divided into a warm-water fauna realm termed the “4A” Realm and the cold-to-cool-water realm named the “European Realm”, rather than “western” and “eastern” realms as previously. North America, Asia and Australia are assigned to the same realm on the basis of their low-latitude position and the sharing of many benthic genera. Based on palaeobiogeographic data on bradoriids and trilobites, three blocks—the Yangtze, the Tarim and the Kazakhstan—might have formed a big Superyangtze plate, which was probably near Gondwana during the Cambrian.
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