[Taxacom] Dispersal paradigm (was: Antarctic dispersal)

[Ken Kinman]

John,        I found Jason's critiques to be quite insightful.  I would be particularly interested in a straightforward response from you to his question about phylogeny calibration using priors (as follows):
?Anyway, you contend that ?... the point here is that the misrepresentation of minimal ages as actual or maximal has led to erroneous results.? I am sure that you are aware that phylogeny calibration allows for priors to be used and that this is common practice to use log priors to accommodate not just for the uncertainty in the stratigraphy of fossils but also for origination uncertainty. So is your complaint against someone in particular who used a very tight prior or about calibrations in general??
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