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Stage ranges (was Re: Geographic Distribution of Deinonychosauria)
>>> True, but the stages don't last so long that one cannot infer
>>> distributions of nonvolant taxa fairly well from knowledge of the
>>> topographical layout (particularly if taking into account
>> Maastrichtian: 5 Ma, Campanian: 13 Ma...
>> Many stages in the Jurassic are estimated to be about 4 Ma long, which
>> is also the confidence interval on their start and end dates.
For all interested, the ICS has a published database of stage bases