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Two types of criteria are used to recognize relative changes in sea level in the Cretaceous of the Western Interior (Fig. 1). The first type is a highstand condition identified by: (1) highstand regression of the shoreline, depositing widespread shallow-marine sandstone and shale and shoreline sandstone, sometimese overlain by a widespread coal layer (Fig. 2); (2) deposits that fill incised drainage, reflecting rising sea level and landward movement of the shoreline (transgression) associated with coastal onlap; the incised valley fill may be zoned-more freshwater environments in the lower part and brackish to marine environments in the upper part (Figs....

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