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GSA Bulletin celebrates GSA's 125th Anniversary with new geologic time scale
Date:12/27/2012

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The Geological Society of America Time Scale
J.D. Walker et al., Dept. of Geology, University of Kansas, Lawrence, KS 66045, USA. Posted online 10 Dec. 2012; http://dx.doi.org/10.1130/B30712.1.

The Geological Society of America has maintained and published a geologic time scale for its membership, the scientific community, and the public at large for 30 years. In this paper, J.D. Walker and colleagues present the newest version of the GSA time scale, which is fully updated, incorporating recent advances in understanding numerical ages and the overall succession of rocks and evolution of life on Earth's surface. This paper, one of a series of invited papers for GSA Bulletin in celebration of GSA's 125th anniversary, describes how geologic time scales have been established, including discussion of the underlying methods of determining geologic time. The paper also has an historical focus -- the first geologic time scale, for example, was published 100 years ago by Arthur Holmes -- but this contribution by Walker and col
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Contact: Kea Giles
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Geological Society of America
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