Paleonet: Re Morphological Innovation

Ken Campbell Ken.Campbell at
Fri Apr 20 04:44:00 UTC 2007

Dear Charles

Charles the message below does not seem to be intended for me  - was 
it substituted for mine?  I hope that you are well.

Ken Campbell

>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:
>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.  Mathematical Geology 
>>For single-core comparison to a precise age model, I suggest graphic
>>correlation with one-sided sample-interval bars or boxes (up to the next
>>highest sample that could have contained the species but didn't for
>>last/highest occurrences; down to the next lowest sample that  could have
>>contained the species but didn't for first/lowest occurrences).
>>I heartily suggest Gilinsky and Signor's 1991 Paleo Society shortcourse
>>(#4) notes.
>>Lucy E. Edwards
>>U.S. Geological Survey
>>926A National Center
>>Reston, VA 20192
>>phone: 703 648-5272
>>leedward at
>>Paleonet mailing list
>>Paleonet at
>Charles Marshall
>Professor, Depts. of Organismic and Evolutionary Biology
>	& Earth and Planetary Sciences
>Curator, Dept. of Invertebrate Paleontology,
>	Museum of Comparative Zoology
>(617) 495-2572 office
>(617) 496-5535 fax
>cmarshal at
>Paleonet mailing list
>Paleonet at
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