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Depends on the river of course.
But as a general rule: Shallow fast flowing rivers have rocky or sandy/rocky
beds. Larger deeper and slower moving rivers tend to have a muddier bed.

I would expect that in general a river deep enough for a sauropod to get
shoulder deep in, and with a current slow enough to make it comfortable to
stand in, would most likely have a relatively soft muddy bed.

-----Original Message-----
From: Jeff Poling [mailto:jpoling@dinosauria.com]
Sent: 20 July 1998 19:22
To: dinosaur@usc.edu

At 11:15 AM 7/20/98 -0700, you wrote:
>As I ponder this, it occurs to me that there are many places where water is
>not bordered by mud.  Surely mud is a potential problem sometimes but
>perhaps that is the exception?

   Anybody know whether the typical river/stream bed is soft or firm?

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