K-T bioturbation

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>
> > Beginning with our work on ODP Leg 113, Site 690, Jim Pospichal has
> developed considerable evidence to demonstrate how Ir spikes above and
> below the boundary can be generated by secondary processes, including
> bioturbation.  He has shown that large-bodied bioturbators can move
> sediment down section as much as one meterat deep-sea sites with
> paleodepths over 2000 m.  By this msg I'll ask him to post a few of
> his key references for you.  --Woody Wise
>
> Thanks much, Woody.  I suspected that even the deep-sea critters were
> reworking sediment that much (the shallow-water critters definitely have a big
> impact).  I look forward to the pertinent references from Jim.
>
> Anthony J. Martin
> Geosciences Program, Emory University
> Atlanta, Georgia  USA
>

The paper Woody has referred to is

Pospichal et al. (1990), GSA Special Paper 247, p. 497-507.

a little bit about the subject is also discussed in
Pospichal and Huber (1992), AGU monograph 70, p. 275-294.

These may shed some light on the matter.

- Jim Pospichal