Re: Everything you know about the Iren Dabasu age is (right)

[David Marjanovic <david.marjanovic@gmx.at>]

> > Palynomorphs still have big advantages: they occur
> > in exorbitant numbers,
>
> Not in Mongolia; they are practically nonexistent
> there.

Strange... if even keratin is occasionally preserved there...

> > It's indicative of a Maastrichtian age _and a
> > certain environment_.
>
>  It occurs in fluvial environments from North America
> to Omnogov to China.

Which fluvial environments?

Rivers become braided when there's no vegetation that could consolidate the 
soil. This lets me suppose that the Iren Dabasu environment was a rather dry 
affair, probably with only seasonal rivers.

> > >> 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.
>
> Yes they did, see above, supposedly they are ALL
> upper Campanian-lower Maastrichian in age. Supposedly
> they all spanned the same chrons.

I read this differently. I interpret it as "they all fit within the interval 
from the upper CMP to the lower MAA", not as "they all span that whole 
interval" (which would BTW be a bit much... well over 5 million years!).