Tectonic Unit: OTrA
         Name: undivided
 
  Description: undivided calcareous mudstone, siltstone,
               thin-bedded limestone, subordinate mafic to felsic
               volcanics, carbonate, chert, minor ultramafics;
               locally metamorphosed to slate, phyllite, schist,
               gneiss and marble; marine
 
    Formation: Insular Belt
                  Admiralty Subterrane of Alexander Terrane
                       OTrA undivided includes:
                       D    Gambier Bay
                       O    Hood Bay
               Coast Belt
                  Stikine & Alexander Terranes
                       metasediments, subordinate metavolcanics in 
                       western Coast Plutonic Complex
 
    Age Range: Ordovician - Triassic
  Maximum Age: 510.0 Ma
  Minimum Age: 208.0 Ma