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 Mosasaurs leaving puncture marks in ammonoid shells are discussed by Peter
 Ward in "Time Machines" (1998).  Simulated mosasaur bites on shells
 (nautiloids, if memory serves) always resulted in shattering not tooth
 holes - not that the mosasaur cares how it gets at the tasty bits.  The
 conclusion was that the holes were made by marine borers after the death
 the ammonoid.
 Stephen Priestley