Geological periods

[boneill@shellus.com]

> [snip] 
>
>There is a more recent edition of Harland et al.: 1989. 
>
>[snip]
 
 There is an even more recent radiometric time scale just out from 
SEPM (Society for Sedimentary Geology):  Special Publication 54

        "Geochronology, Time Scales and Global Stratigraphic Corelation"
        Edited by: W.A. Berggren, D. Kent, M.P. Aubry and J. Hardenbol

 The publication came out in December 1995 and can be ordered from:

        SEPM (Society for Sedimentary Geology)
        1731 E. 71st Street
        Tulsa, OK  74136-5108

        (918) 493-3361

The papers in the volume result from an SEPM Research Symposium held
here in New Orleans during the AAPG (Am. Assoc. of Petroleum
Geologists) annual convention in 1993.  Based on the early pre-prints,
etc. this may well be the new "standard" at least for a while. 

Brian
        
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