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Horseshoe Canyon dinos

     Thanks to Thomas Holtz for his answers.  I'm currently seeking more details and clarification:
      Is the fifth (top) unit of the Horseshoe Canyon formation early Late Maastrichtian in age?  Are centrosaurines, lambeosaurs and Saurolophus absent in this top unit?  Are any ornithiscians already absent in the underlying fourth unit?  (late-early or mid-Maastrichtian?)
      Dr. Eberth mentioned an Albertosaurus bonebed in the upper Horseshoe Canyon.  Are these remains in the top unit or the fourth one below it?  How well are tyrannosaurs represented in the top unit?