Horseshoe Canyon

[KELL00BELL@aol.com]

      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?
     --Tim