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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?