Coba jelasin Bacaan lanjutan dari Eosen dong

Ogg, Jim; June, 2004, Overview of Global Boundary Stratotype Sections and Points (GSSP's)

Stanley, Steven M. Earth System History. New York: W.H. Freeman and Company, 1999. ISBN 0-7167-2882-6

J.J. Hooker M.E. Collinson and N.P. Sille, 2004. "Eocene–Oligocene mammalian faunal turnover in the Hampshire Basin, UK: calibration to the global time scale and the major cooling event" in Journal of the Geological Society 161.2, pp 161–172