Re: Re(2): All kinds of odd observat...

[N.MacLeod@xxxxxxxxx (N. MacLeod)]

Burrowing is a problem - but one that effects proponents of the impact
hypothesis more than its critics.  The Danish boundary sections of Stvens
Klint and Nye Klov are extensively burrowed (see Tony Ekdale's paper in the
Copenhagen K/T symposium volume), but these successions exhibit a single Ir
anomaly.  The multiple anomalies at Brazos and Braggs are
lithostratigraphically too far apart to be the result of burrowing.
Remember, these are anomalies, they stand up above the background variation
like skyscrapers in the middle of the a wheat field.  Certainly, more work
needs to be done on the whole question of burrowing across the K/T
boundary.  Ekdale's work, along with Svarda's recent Geology paper on
bioturbation in the Gulf Coast K/T sections provides a good start.

Norm MacLeod


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Norman MacLeod
Senior Scientific Officer
N.MacLeod@nhm.ac.uk (Internet)
N.MacLeod@uk.ac.nhm (Janet)

Address: Dept. of Palaeontology, The Natural History Museum,
         Cromwell Road, London, SW7 5BD

Office Phone: 071-938-9006
Dept. FAX:  071-938-9277
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