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Re: Campanian question
Who knows. Right now, I consider it most likely that the origin of the
"Campanian explosion" is the accessibility and productivity of Judith River
and Edmonton strata.
I can't agree on this. (sorry)
Looking at the Campanian holotypes in Asia i see the same increase in
diversity as in North America. There is an increase in diversity in the
Asian Campanian of more than 250 %. My holotype count of the Campanian
gives an almost equal count (Asia wins) in those two continents.