Palæos:		Timescale
TIMESCALE		References

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Timescale References

Allaby A. & Allaby M., eds., "A Dictionary of Earth Sciences," [1990], Oxford University Press: Oxford UK, Second Edition, 1999.

Harland W.B., et al., "A Geologic Time Scale 1989," Cambridge University Press: Cambridge UK, Revised Edition, 1990.

Huff WD, D Davis, SM Bergström, MPS Krekeler, DR Kolata, & C Cingolani (1997), A biostratigiaphically well-constriained K-bentonite U-Pb zircon age of the lowermost Darriwilian Stage (Middle Ordovician) from the Argentine Precordillera. Episodes 20: 29-33.

IUCS (2004), International Stratigraphic Charts, International Union of Geological Sciences: International Commission on Stratigraphy, 2004

Judson S. & S.M. Richardson, Earth: An Introduction to Geologic Change, (Englewood Cliffs, NJ, Prentice Hall, 1995) (Englewood Cliffs, NJ, Prentice Hall, 1995). 

Mitchell CE, X Chen, SM Bergström, Y-D Zhang, Z-H Wang, BD Webby & SC Finney (1997), Definition of a global boundary stratotype for the Darriwilian Stage of the Ordovician System. Episodes 20: 158-166.

Poling J, Geologic Ages of Earth History page.  Uses periods and dates from A Geologic Time Scale 1989 by Harland, W. Brian, Richard Armstrong, Allan Cox, Craig Lorraine, Alan Smith and David Smith, and from "A Triassic, Jurassic and Cretaceous time scale," by Gradstein, F.M., F.P. Agterberg, J.G. Ogg, J. Hardenbol, P. van Veen, J. Thierry and Z. Huang. 1995.in pp. 95-126 of W.A. Bergrgren, D.V. Kent, M.-P. Aubry & J. Hardenbol (eds.), Geochronology, Time Scales, and Global Stratigraphic Correlation. SEPM Special Publication No.54.)