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Single point calibrations have in turn been superseded by multiple sets of calibration bounds or priors. The timing of placental mammal diversification remains especially contentious, with major recent studies reinforcing divisions between older, molecular-based estimates ( Meredith et al. 2012 ) and younger fossil-based estimates ( Wible et al. In the most extensively sampled phylogenetic analysis of living and fossil eutherians O'Leary et al. 1 a), in which all placentals arose from a single survivor of the KPg mass extinction.

We tested the alternative placements of in the referred arthropod tree via the likelihood checkpoints method.

Divergence dates were calculated using Bayesian relaxed molecular clock and penalized likelihood methods.

UMR 5138 (mixed research unit) was set up in 2001 and is called "Archeometry and archaeology: origin, dating and materials technologies".

It was created with a view to boosting the archeometric potential of the Lyon region and to develop joint programmes between the Laboratoire de Céramologie [Ceramology laboratory], the Centre de Datation par le Radiocarbone [Carbon-dating centre], and the Earth sciences UFR (training and research unit).

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