Re: New date for Chicxulub?

[Phil Bigelow <bigelowp@juno.com>]

Quoting from GSA's web page: 

>http://www.geosociety.org/news/pr/06-14.htm

"In the Gulf of Mexico, close to the impact site, iridium is found at a
weak concentration, just one part per billion, says Harting. Yet farther
away in Denmark, higher concentrations of iridium are found.  "This
doesn?t really make sense," he [Markus Harting] said, unless, of course,
the impact and iridium layer are not related."



The Fish Clay iridium site in Denmark had relatively low current
velocities, allowing for a more complete record of air-fall iridium to
accumulate on the sea floor.

But, depending on where one samples, the concentration of Ir in marine
sections will vary greatly.  It depends on the degree of calmness of the
overlying paleo-water column.

The above claim that the data in support of a direct relationship between
the spherules and the iridium layer "doesn't make sense" seems much ado
about nothing.
 
<pb>
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