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Re: help

On Mon, 6 Feb 1995 farlow@CVAX.IPFW.INDIANA.EDU wrote:

> Does anybody know about published studies/speculations about changes in
> rates of terrestrial plant productivity (if any) over the Late Paleozoic,
> Mesozoic, and Cenozoic?  I'm looking for changes in isotope ratios,
> weathering rates, etc. that could be taken as proxies for terrestrial
> (NOT marine) productivity changes, either for restricted geographic regions
> or the planet as a whole. 
I would also enjoy examining any data found on the subject of late 
Paleozoic environments, mostly on any  newly proposed theories on the 
condition of marginal to non-marine environments and the regional 
variations associated with each (if applicable).
                                                        MUCH THANKS,