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RE: Latest K dinosaurian diversity trends

Paleosols from the Hell Creek Fm appear to represent different environments 
than those typically found in the Dinosaur Park Fm. Dinosaur Park Fm paleosols 
are better drained, with lower water tables compared to Hell Creek Paleosols. 
The closest pedogenic analog to Dinosaur Park Fm paleosols are paleosols from 
the upper section of the Horseshoe Canyon Fm. 
To the best of my knowledge, paleosols that represent environments like those 
seen in the Dinosaur Park and upper Horseshoe Canyon Fms have not yet been 
described for upper Maastrichtian units in western North America. For info on 
Hell Creek paleosols, see the ref below:

Retallack, G.J., Leahy, G.D. and Spoon, M.D., 1987. Evidence from paleosols for 
ecosystem changes across the Cretaceous-Tertiary boundary in eastern Montana. 
Geology, 15, 1090-1093.

Guy Leahy

> Date: Tue, 4 Jan 2011 01:03:19 +0000
> From: df9465@yahoo.co.uk
> To: dinosaur@usc.edu
> Subject: Re: Latest K dinosaurian diversity trends
> D. Marjanovic said:
> >Besides, do the Dinosaur Park Fm and the Hell Creek Fm even represent the 
> >same 
> >environment?
> More or less. Both are coastal swamps. There is more coal in the DPFm, but 
> you 
> do get coaly units in the Hell Creek, especially when you get out into the 
> dakotas, closer to the seaway.