@inbook{LofgrenLillegravenClemensGingerichWilliamson+2004+43+105,
url = {https://doi.org/10.7312/wood13040-005},
title = {3. Paleocene Biochronology: The Puercan Through Clarkforkian Land Mammal Ages},
booktitle = {Late Cretaceous and Cenozoic Mammals of North America},
booktitle = {Biostratigraphy and Geochronology},
author = {Donald L. Lofgren and Jason A. Lillegraven and William A. Clemens and Philip D. Gingerich and Thomas E. Williamson},
editor = {Michael O. Woodburne},
publisher = {Columbia University Press},
address = {New York Chichester, West Sussex},
pages = {43--105},
doi = {doi:10.7312/wood13040-005},
isbn = {9780231503785},
year = {2004},
lastchecked = {2026-05-02}
}