The last day in the life of a Pachyrhinosaurus. The Pachyrhinosaurus is probably my favourite among the Ceratopsidae, even though it may not seem as attractive as triceratops or Styracosaurus. That’s because back in 1990, I covered the announcement of the discovery of the Pachyrhinosaurus bone bed near Grand Prairie Alberta in what is called the Wapiti Formation and for an hour or so observed the work being done on the bones at the Royal Tyrrell Museum. The PNSO pachyrhinosaurs enjoys a spring day until it and its herd is swept away in a flash flood.