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Re: Age of the Barun Goyot, Djadoktha and Nemegt Formations

The magnetostratigraphy mentioned in the above
abstract suggests that the Barun Goyot, Djadoktha
and Nemegt Formations are all upper Campanian-
Lower Maastrictian in age,

This makes no sense; they couldn't be contemporaneous.

Nobody said they were. Maybe the Djadokhta is upper Campanian, the Baruungoyot is around the CMP-MAA boundary, and the Nemegt is lower Maastrichtian?

The Nemegt overlies the Barun Goyot
which overlies the Djadokhta. Radiometric dating
indicates the latter is c 75 Ma or a little younger.
The Barun Goyot is probably latest Campanian-basal
Maastrichtian in age and the Nemegt late early-mid
Maastrichtian.


Looks like you agree. :-)

The Djadokhta is only coeval with the lowest part of
the Horseshoe Canyon, and the Nemegt only the upper
part.

Where did you get that precision?