RE: [Spam:0004 SpamScore] Re: paleonet Ichnofossil question

["Hasiotis, Stephen Tom" <hasiotis@xxxxxx>]

A caveat to Dave's comment is that bioturbation can be just as extensive
in continental deposits as in marine deposits.  Also, the general shape
of such simple burrows as J- or I-shaped morphology can be similar in
both depositional realms.  So, can cannot depend on the degree of
bioturbation or the general shape of many burrows to tell you what
deposits you are working in.

Cheers,
Steve 

Stephen T. Hasiotis, Ph.D.
Associate Professor
University of Kansas
Department of Geology
1475 Jayhawk Blvd.
120 Lindley Hall
Lawrence, KS 66045-7613
Office: 785.864.4941
Fax:     785.864.5276
hasiotis@ku.edu


-----Original Message-----
From: paleonet-owner@nhm.ac.uk [mailto:paleonet-owner@nhm.ac.uk] On
Behalf Of bivalve@mail.davidson.alumlink.com
Sent: Thursday, July 13, 2006 11:42 AM
To: paleonet@nhm.ac.uk
Subject: [Spam:0004 SpamScore] Re: paleonet Ichnofossil question


>"Have you ever noticed bioturbation in the Cretaceous
>strata (or other strata)?
>
>While mapping, i have noticed some heavily bioturbated
>strata and  j-shaped burrows.  My knowledge of trace
>fossils is lacking, but what  i remember is that these are usually 
>marine.  i ask because the  strata i find this in looks neogene, but i 
>want to call it Cretaceous  b/c of the fossils."

Bioturbation is quite common in Cretaceous and Neogene
strata, as well as most other Phanerozoic intervals.  It
tends to be heavier in marine than non-marine settings, but
is present in both.  Some burrow types are more common in or confined to
a particualr time interval, but many are found in many ages.  

Dr. David Campbell
425 Scientific Collections
Box 870345, University of Alabama
Tuscaloosa AL 35487-0345
"James gave the huffle of a snail in danger/ But no one
heard him at all."-A. A. Milne