Gradstein, Felix M. A geologic time scale 2004 F. M. Gradstein, James G. Ogg and A. Gilbert Smith - Cambridge Cambridge University Press 2004 - xix+589p. appendix; biblio; col. plates; figs; index; tables ISBN: 0-521-78673-8 Subjects--Topical Terms: BiostratigraphyGeologic Time-scaleGeochronologyGeologic PeriodsStratigraphyTime Scale Universal Decimal Class. No.: 551.7.03 / GRA