3. Paleocene Biochronology: The Puercan Through Clarkforkian Land Mammal Ages

By Donald L. Lofgren, J. Lillegraven, W. Clemens, P. Gingerich, T. Williamson, M. Woodburne. 2004

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BIOCHRONOLOGICAL RELATIONSHIPS OF THE EARLIEST SOUTH AMERICAN PALEOGENE MAMMALIAN FAUNAS (2009, background): “While in North America, the Mesozoic mammal families survived into the Paleocene (Cifelli et al. 2004; Lofgren et al. 2004), in South America gondwanan mammals were replaced by Laurasian immigrants.”
Mammalian extinction, survival, and recovery dynamics across the Cretaceous-Paleogene boundary in northeastern Montana, USA (2014, methodology): “Areas in western North America that preserve Lancian and Puercan fossil localities stretch from western Canada in the north to Texas in the south.”
Paleontological evidence to date the tree of life. (2006, background): “The oldest generally accepted viverravid is Protictis from the Fort Union/Polecat Bench Formation, assigned to the basal Torrejonian (To1) NALMA, and dated as 63.6–62.5 MYA (Lofgren et al. 2004).”
Mammals across the K/Pg boundary in northeastern Montana, U.S.A.: dental morphology and body-size patterns reveal extinction selectivity and immigrant-fueled ecospace filling (2013, background): “‘‘Withincommunity’’ (alpha) richness of eutherians also increased more than fivefold from latest Cretaceous faunas with no more than eight species to early middle Paleocene faunas with greater than 40 species (Cifelli et al. 2004; Lofgren et al. 2004).”