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Fwd: Triceratops survived till very end of Cretaceous



> One more time.
> 
> I would give a good chance that the horn fossil was reworked by the 
> sedimentary regime.  ie, deposited, reworked by stream/river meander and 
> redeposited again dozens of times in it's trip "down stream".  Triceratops 
> horns can be quite tough.  I find Hell Creek fossils in more recent sediments 
> all the time.  Particularly, Pleistocene loess blown in below a microsite.  
> The 65 million year old fossils easily contaminate the newer material 
> surviving yet another re-transport/re-deposition yet again. Late Cretaceous 
> Hell Creek Rivers redepositing older fossils multiple times was the rule, not 
> the exception IMHO.
> 
> As I drive up section toward the K/T boundary (two miles west of my house),  
> the Hell Creek becomes much harder to find microsites and fossiliferous 
> outcroppings in.  I know where there is a partial Triceratops outcropping 
> within 50 stratigraphic feet of the boundary however.   The boundary "zone" 
> itself is essentially barren of fossils.  I've only found ravaged petrified 
> wood there without going micro and I've spent some time looking at it.
> 
> My point is, things can be reworked to above the boundary easily.  It appears 
> to me from my isolated viewpoint that faunal diversity and abundance declines 
> up section considerably here on the Montana/Wyoming border as you approach 
> the K/T.  They won't find many fossils up that high in the section.
> 
> Frank Bliss
> MS Biostratigraphy
> Weston, Wyoming
> 
> 
> 
> 
> On Jul 12, 2011, at 8:08 PM, bh480@scn.org wrote:
> 
>> From: Ben Creisler
>> bh480@scn.org
>> 
>> I don't have the official article citation--it's not been posted on the
>> Biology Letters website yet. However, there are many news stories out about
>> the discovery of a Triceratops horn only 5 inches from the K/Pg boundary in
>> Montana. 
>> 
>> 
>> http://www.nature.com/news/2011/110713/full/news.2011.411.html
>> 
>> http://news.discovery.com/animals/dinosaur-last-survivor-extinction-tricerat
>> ops-110712.html
>> 
>> http://news.sciencemag.org/sciencenow/2011/07/case-closed-for-dino-killer.ht
>> ml?ref=hp
>> 
>> http://www.eurekalert.org/pub_releases/2011-07/yu-ldb071211.php
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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>