fossialization and floods

[hicks@mail.eden.com]

        I was watching an old videotaped NOVA (about T-rex) recently when a 
thought occurred to me.  For an animal as big as a dinosaur to become 
a fossil, it has to be buried fast enough that scavangers can't get 
to it.  Am I correct in thinking that these conditions usually 
only occur in floods?
        I realize that there are some exceptions to the rule (such as the 
Gobi dinos that buried by collapsing sand banks), but my point is 
that a majority of fossils of large animals are created by floods.  
Am I right or wrong?
                                        Neil T. Hicks