Re: Suspicious impact craters and iridium layers?

[Phil Bigelow <bigelowp@juno.com>]

On Sun, 19 Jun 2005 04:47:32 -0700 (PDT) Tim Donovan <uwrk2@yahoo.com>
writes:
> 
> I think Wroblewski was referring to sedimentation in
> the region throughout the late Maastrichtian.


If he is only referring to Wyoming seds., then he can't generalize about
the rest of the Western Interior Seaway during the late Maastrichtian.

Depositional environments and paleoecosystems are site-specific, just
like today's environments.

<pb>
--


> --- Phil Bigelow <bigelowp@juno.com> wrote:
> 
> > Could this explain the deeply-channeled Bug Creek
> > beds?  Massive
> > post-impact rain storms over the Laramide highlands?
> > 
> > Some sed. petrologist should look carefully at the
> > provenance of the
> > mineral constituents of the Bug Creek sandstone and
> > search for components
> > not commonly seen in the underlying (K) sandstones. 
> > Maybe new source
> > areas were eroding immediately after the impact.
> > 
> > <pb>
> > --
> > 
> > 
> > On Sat, 18 Jun 2005 07:52:58 -0700 (PDT) Tim Donovan
> > <uwrk2@yahoo.com>
> > writes:
> > > 
> > > 
> > > --- David Marjanovic <david.marjanovic@gmx.at>
> > wrote:
> > > 
> > > > >  Wroblewski disputed even that, based on work
> > in
> > > > WY.
> > > > 
> > > > Interesting. When? How old is his paper?
> > > 
> > > 
> > >  In 2002 he wrote that "The terminal K marine
> > > regression was therefore not a continent-scale,
> > > eustatic drainage event, but simply the result of
> > a
> > > massive influx of sediment."
> > > 
> > > 
> > > 
> > >           
> > >
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> 
> 
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