The Ordovician and Silurian rocks of the Canadian Arctic Archipelago and northern Greenland are characterized by a facies change from carbonates to fine-grained clastics — a facies change that may be traced from the Yukon Territory through the Canadian Arctic Archipelago to northeastern Greenland. In the central part of southern Peary Land on northern Greenland, small reefs formed during Middle and part of Late Silurian time. These reefs have a lateral shale equivalent and are the youngest carbonates of an extensive carbonate shelf which was subsequently covered by siltstone. The largest reefs have an estimated thickness of 1500 ft (450 m). Paleogeographic and paleoecological conditions for these reefs may have been similar to those that exist at present on the Queensland and Sahul shelves of Australia.

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