Talk:Rhynie chert
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[edit] Age of formation
Rice et al. 1995 give a biostratigraphic age of Pragian (411.2-407.0 Ma according to Gradstein et al. 2004) and a radiometric age of 396±12 Ma. At the time the two independent age estimates matched very well, but due a major revision of dates of the Devonian stage boundaries they no longer do. The uppermost radiometric age within the quoted error could just fit with the biostratigraphic age. At the moment the position of the Rhynie Chert on the Devonian Timeline Template shows up as Eifelian, which doesn't make much sense. A U-Pb age of 409.6±1.1 Ma is reported here [1], but not yet in a peer-reviewed journal. Do we need to wait until the U-Pb age paper is published, or is the BGS report a good enough source anyway? Mikenorton (talk) 10:38, 1 June 2008 (UTC)
- I'd consider the BGS a reliable source. At a minimum an indication of the uncertainty of Rice's age should be included in the article. Smith609 Talk 18:22, 1 June 2008 (UTC)
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- I'm going to go with the BGS report and alter the Devonian timeline accordingly. Thanks. Mikenorton (talk) 14:58, 3 June 2008 (UTC)
