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Shown in blue are the North Carolina shale basins from the Triassic period about 220 million years ago, <br />and a proposed, or unassessed, basin in orange. <br />Chatham <br />� <br />� <br />M0 <br />xgvx/my H@mett <br />Anson <br />Richmond <br />^s 0 <br />A. ` <br />Cumberland \ Sampson <br />M Geologists believe gas-rich <br />planned this year. <br />Sources: U.S. Geological Survey, N.C. Geological Survey, <br />Johnston <br />Staff graphic <br />