Curiously the theory of PE has been tested (see above re snails, also see Differential Dispersal Of Introduced Species - An Aspect of Punctuated Equilibrium.
I would imagine a study of what happens within a species is hardly a valid test of PE.
Another thing to look at is the geographical-temporal (space-time) matrix the fossils are embedded in and their relationship to sister populations (see Alfred Russel Wallace and Biogeography)
A theory based on fossil evidence is a "test" for another theory based on fossils (PE)? I don't think so.
Edited by Dredge, : No reason given.