Figure 3. Deposit relation of the Chartai and Bayan Obo Groups as cover beds deposited on the continental slope of the North China Platform or craton (modified from Qiao and others, 1991). A, Advance of the sea at an earlier stage, when the Chartai Group was deposited. B, Retreat of the sea at a later stage, when the Bayan Obo Group was deposited.
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