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In page Geography of New Caledonia:

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Since the age of the dinosaurs, as the island moved north due to the effects of continental drift, some geologists assert that it may have been fully submerged at various intervals. Botanists, however, argue that there must have been some areas that remained above sea level, serving as refugia for the descendants of the original flora that inhabited the island when it broke away from Gondwana. The isolation of New Caledonia was not absolute, however. New species came to New Caledonia while species of Gondwanan origin were able to penetrate further eastward into the Pacific Island region.[citation needed]