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Horseshoe Canyon

    I have a few questions concerning Horseshoe Canyon research:
      --What is the age of Upper horseshoe Canyon strata?  Is the entire unit only basal Maastrichtian in age, or is the upper part mid-Maastrichtian (as it underlies the Late Maastrichtian Scollard?)
      --What faunal changes, if any, are evident by late Horseshoe Canyon time, compared to lower in the unit?
      --Is it certain the tyrannosaurs are albertosaurs, not subadults of an early species of Tyrannosaurus eg T. bataar?