Geochronology and mammalian biostratigraphy of middle and upper Paleocene continental strata, Bighorn basin, Wyoming

The Bighorn basin, Wyoming preserves complete records of middle Paleocene to lower Ecocence continental data and its geochronology is studied by geometric polarity time scale (GPTS). The biostratigraphic revision reveal that Mason Pocket, the primary fauna upon which the Tiffanian land-mammal age was originally based, is correlative to Chron 26and not Chron 25 and the age calibration of the biozone provides a robust framework for testing the synchrony of taxonomic first and last appearances.