A thick, unusually continuous record of late Proterozoic and Paleozoic continental margin sedimentation exists in east-central Alaska. Depositional and lithofacies relationships show that shelf conditions and source areas persisted to the northeast, whereas open-marine conditions existed to the south and west. Lithostratigraphic correlations with units of equivalent age elsewhere in Alaska are poor, but very good correlations can be made with Cordilleran rocks in northwest Canada. The geology is consistent with what would be expected along a rifted or collapsed continental margin along a south- to west-facing depositional system. Insufficient data exist to demonstrate westward continuation of this margin into other parts of Alaska. This may indicate that a major re-entrant in, or the western terminus of, the Paleozoic North American continent was in east-central Alaska.

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