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Biostratigraphic zone data compiled from outcrop and cored sections in Colorado and New Mexico are used for correlation of rock units below and above the Cretaceous-Tertiary boundary. Data localities are in the Sand Wash basin, Williams Fork Mountains, Grand Hogback, and Piceance Creek basin, northwestern Colorado; Denver basin, eastern Colorado; Raton basin, southeastern Colorado and northeastern New Mexico; San Juan Mountains and northern San Juan basin, southwestern Colorado; and San Juan basin, northwestern New Mexico.

Reference sections of intertonguing marine and nonmarine rocks of Campanian and Maastrichtian age are present in northwestern and eastern Colorado. Coexisting ammonite and palynomorph zones...

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