| [Thread Prev] | [Thread Next] | [Thread Index] | [Date Prev] | [Date Next] | [Date Index] |
>GSA has re-posted its 1999 Geologic Time Scale at >http://geosociety.org/science/timescale/timescl.pdf > >It can be printed from that site. People might find the International Stratigraphic Chart published by the IUGS useful as well. It can be downloaded from the International Commission on Stratigraphy site (http://www.micropress.org/stratigraphy/tscale.htm): http://www.micropress.org/stratigraphy/chart.pdf It's updated to summer 2001 and includes the current status of formal and proposed chronostratigraphic units. One thing that always bugs me about the GSA chart is that the Silurian epochs are mistakenly listed as ages. Llandovery, Wenlock, etc. are epochs and should not have an adjectival ending (e.g., "Wenlockian"). They're equivalent, e.g., to Lower, Middle, and Upper Devonian, not Emsian, Givetian, etc. The Silurian ages are Sheinwoodian, Homerian, etc. J
Partial index: