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RE: Diplodocus: Return to the Swamps????





>> From: Dann Pigdon 
>> Subject: Re: Diplodocus: Return to the Swamps????
>> To: dinosaur@usc.edu
>> Date: Sunday, December 13, 2009, 10:39 PM
>> Here's a good reconstruction of what
>> a theropod foot looks like going into and coming out of mud,
>>
>> courtesy of Stephen Gatesy:
>>
>> http://www.brown.edu/Administration/News_Bureau/1998-99/98-123g.html
>>
>> It goes in splayed with plenty of resistance (limiting the
>> depth of penetration), but is drawn out with
>> converged toes that offer far less resistance.
>
> All true. But again you miss the reality of a swamp. There is a depth at 
> which the theropod is helpless and can be simply run over.
 
 But by the time you get that deep, isn't the sauropod going to have its belly 
either scraping the mud surface or a foot or three under the mud?
 
 
>> It would have been awkward, but would have provided even
>> more surface area to prevent sinking
>> in the first place.
>
> Again, we are taking the sinking case. Going _over_ a deep swamp* (the 
> non-sinking case) isn't an option for multi-ton cursorial bipeds, especially 
> after thorough turbation and mixing by much larger and longer-legged quads. 
> Going through one (the sinking case) is where large quads excel. After a 
> period of time, a swamp would become thoroughly sauropod-ized, and certain 
> failure for any large theropod.
 
Sounds like a buffet for crocodilians.
                                          
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