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<div>Dear Charles</div>
<div><br></div>
<div>Charles the message below does not seem to be intended for me 
- was it substituted for mine?  I hope that you are well.</div>
<div><br></div>
<div>Ken Campbell</div>
<div><br></div>
<blockquote type="cite" cite>Of course, if your taxon is not found in
every sample within its range, then there is a significant probability
that it was present but no preserved in the samples immediately beyond
its last occurrences; in these cases you need graphic correlation (see
Lucy's comments below), or something like the pilot method (see
reference below) we developed to estimate how much further the taxon
might have persisted undetected, given how frequently it was
encountered in its known stratigraphic range:</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font color="#000000">Weiss, R.E., and
Marshall, C.R.  1999.  The Uncertainty in the True End Point
of a Fossil's Stratigraphic Range When Stratigraphic Sections are
Sampled Discretely. <u> Mathematical Geology</u> 
31(4):435-453.</font></blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><br>
<blockquote type="cite" cite>For single-core comparison to a precise
age model, I suggest graphic<br>
correlation with one-sided sample-interval bars or boxes (up to the
next<br>
highest sample that could have contained the species but didn't
for<br>
last/highest occurrences; down to the next lowest sample that 
could have<br>
contained the species but didn't for first/lowest occurrences).<br>
<br>
I heartily suggest Gilinsky and Signor's 1991 Paleo Society
shortcourse<br>
(#4) notes.<br>
<br>
****************<br>
Lucy E. Edwards<br>
U.S. Geological Survey<br>
926A National Center<br>
Reston, VA 20192<br>
phone: 703 648-5272<br>
leedward@usgs.gov<br>
****************<br>
<br>
<br>
_______________________________________________<br>
Paleonet mailing list<br>
Paleonet@nhm.ac.uk<br>
http://mailman.nhm.ac.uk/mailman/listinfo/paleonet</blockquote>
</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><tt>--</tt></blockquote>
<blockquote type="cite" cite><font
color="#000000"><br></font></blockquote>
<blockquote type="cite" cite><font
color="#000000">*************************************</font></blockquote
>
<blockquote type="cite" cite><font color="#000000">Charles
Marshall</font></blockquote>
<blockquote type="cite" cite><font
color="#000000"><br></font></blockquote>
<blockquote type="cite" cite><font color="#000000">Professor, Depts.
of Organismic and Evolutionary
Biology<x-tab>       
</x-tab><x-tab>       
</x-tab></font></blockquote>
<blockquote type="cite" cite><font
color="#000000"><x-tab>       
</x-tab>& Earth and Planetary Sciences<x-tab> 
</x-tab><x-tab>       
</x-tab></font></blockquote>
<blockquote type="cite" cite><font color="#000000">Curator, Dept. of
Invertebrate Paleontology,<x-tab>   
</x-tab><x-tab>       
</x-tab><x-tab>        </x-tab><br>
<x-tab>        </x-tab>Museum of
Comparative Zoology</font><br>
</blockquote>
<blockquote type="cite" cite><font color="#000000">(617) 495-2572
office</font></blockquote>
<blockquote type="cite" cite><font color="#000000">(617) 496-5535
fax</font></blockquote>
<blockquote type="cite" cite><font
color="#000000">cmarshal@oeb.harvard.edu</font></blockquote>
<blockquote type="cite" cite><font
color="#000000">*************************************</font></blockquote
>
<blockquote type="cite" cite><br>
_______________________________________________<br>
Paleonet mailing list<br>
Paleonet@nhm.ac.uk<br>
http://mailman.nhm.ac.uk/mailman/listinfo/paleonet</blockquote>
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