Fossil Stomach Contents in Marine Environments

[mjmurphy <4mjmu@rogers.com>]

Have been reading Everhart's extremely cool "Oceans of Kansas" book, and I 
could not help but note the frequent references to "fish in a fish" fossils, 
or more generally fossils with preserved stomach contents.  Am I correct in 
inferring that fossils like this are more common in a marine environment? 
If so, why?  Because meals are more likely to be swallowed whole?  Or not?

Cheers,

M.J.Murphy