Tectonic Unit: uPWl
         Name: Windermere
 
  Description: "middle marble" marker (uPwl) of graded-bedded
               assemblage of interbedded quartz-feldspar grit,
               sandstone, siltstone and shale, commonly maroon
               and green; diamictite in Rocky Mountains;
               limestone in upper part, local greenstone flows,
               breccia and tuff and metamorphic equivalents;
               marine
 
    Formation: Omineca Belt
                  Ancestral North America
               Foreland Belt
                  Ancestral North America
                       middle marble marker
 
    Age Range: Upper Proterozoic
  Maximum Age: 1000.0 Ma
  Minimum Age:  570.0 Ma