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The project "Geologic Time Scale 2004" was completed by an ICS team. This multi-year project summarized the history and status of boundary definitions of all geologic stages, compiled integrated stratigraphy (biologic, chemical, sea-level, magnetic, etc.) for each period, and assembled a numerical age scale from an array of astronomical tuning and radiometric ages.
This book was released in March 2005:
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Gradstein, F.M., Ogg, J.G., and Smith, A.G., Agterberg, F.P., Bleeker, W., Cooper, R.A., Davydov, V., Gibbard, P., Hinnov, L.A., House, M.R., Lourens, L., Luterbacher, H.P., McArthur, J., Melchin, M.J., Robb, L.J., Shergold, J., Villeneuve, M., Wardlaw, B.R., Ali, J., Brinkhuis, H., Hilgen, F.J., Hooker, J., Howarth, R.J., Knoll, A.H., Laskar, J., Monechi, S., Plumb, K.A., Powell, J., Raffi, I., Röhl, U., Sadler, P., Sanfilippo, A., Schmitz, B., Shackleton, N.J., Shields, G.A., Strauss, H., Van Dam, J., van Kolfschoten, T., Veizer, J., and Wilson, D., 2004. A Geologic Time Scale 2004. Cambridge University Press, 589 pages..
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Download stratigraphic charts
Check the main sections of the Geologic Time Scale, with links to GSSPs
(Download GTS 2004 - a promotional poster for the book)
Geologic Time Scale 2004 - why, how and where next? - by F.M. Gradstein & J.G. Ogg