Astronomical calibration of the Paleocene time, Westerhold, T.; Rohl, U.; Raffi, I.; Fornaciari, E.; Monechi, S.; Reale, V.; Bowles, J.; Evans, H. F. , Palaeogeography Palaeoclimatology Palaeoecology, Feb 1, Volume 257, Issue 4, p.377-403, (2008), DOI 10.1016/j.palaeo.2007.09.016 Abstract

Spectral analysis of the lower Eocene Wilkins Peak Member, Green River Formation, Wyoming: Support for Milankovitch cyclicity, Machlus, M. L.; Olsen, P. E.; Christie-Blick, N.; Hemming, S. R. , Earth and Planetary Science Letters, Apr 15, Volume 268, Issue 1-2, p.64-75, (2008), DOI 10.1016/j.epsl.2007.12.024 Abstract