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Map shows the approximate position of the Western Interior Seaway during the middle Campanian as well as the location of modern exposures of Campanian sedimentary strata. Letters in map refer to localities in Fig. 5. EMV: Elkhorn Mountain Volcanics, 1 (solid line): known distribution of Ardmore Bentonite (from Gill and Cobban, 1973; Thomas et al., 1990), 2 (dashed line): Proposed extent of Ardmore Bentonite during Campanian. Modified from Roberts et al. (2005).  

Map shows the approximate position of the Western Interior Seaway during the middle Campanian as well as the location of modern exposures of Campanian sedimentary strata. Letters in map refer to localities in Fig. 5. EMV: Elkhorn Mountain Volcanics, 1 (solid line): known distribution of Ardmore Bentonite (from Gill and Cobban, 1973; Thomas et al., 1990), 2 (dashed line): Proposed extent of Ardmore Bentonite during Campanian. Modified from Roberts et al. (2005).  

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... Formation, improved regional correlations can now be made with greater confidence. Continental deposits coeval to the Wahweap Formation are exposed across the Western Interior Basin in Big Bend National Park in Texas, the San Juan Basin in New Mexico, and the Henry Basin, the Markagunt and Paunsaugunt plateaus, and the Book Cliffs, all in Utah (Fig. 6). Of particular interest is the correla- tion between strata in the Kaiparowits, Markagunt and Paunsau- gunt plateau with the Book Cliffs and the Henry Basin. Wahweap equivalent strata on the Markagunt and Paunsaugunt plateaus, are considered to be roughly equivalent (temporally) to deposits on the Kaiparowits Plateau ( Lawton et al., ...