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Crossdating of Miocene-aged Permineralized Wood from Oregon, USA
Presented by William WRIGHT on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 12
Permineralized (fossilized or 'petrified') wood from many sites around the world can exhibit an incredible degree of preservation, including intact cell structure and sub-cellular features. Yet previous attempts to use traditional dendrochronology on such material have met with only limited success. Here we present the results of ring width analyses of fossil wood samples from two mid-Miocene locations in the United States northwest. Clear crossdating of measured ring width time series on some samples provides proof of the absolute contemporeneity of the rings in those samples and likely of almost all the fossil wood samples within each site. Crossdating of Stinking Water fossil wood samples supports other evidence indicating that these fossil trees are remnants of a forest that was killed, buried and permineralized in place. Crossdating of the Deschutes fossil wood samples is consistent with rafting from growing locations close enough to produce similar patterns in their ring widths.