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Petroleum --- Petroleum reserves --- Geology, Stratigraphic --- Geology, Stratigraphic --- Geology --- From 230 to 570 million years ago --- Appalachian Region.
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Petroleum --- Petroleum reserves --- Geology, Stratigraphic --- Geology, Stratigraphic --- Devonian Geologic Period. --- Geology, Stratigraphic. --- Paleozoic Geologic Period. --- Petroleum --- Petroleum reserves. --- Geology --- Geology. --- From 230 to 570 million years ago --- Appalachian Region.
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