Tectonic Unit: PH
         Name: Halleck
 
  Description: black argillite, greywacke, calcareous siltstone,
               chert, basalt, limestone and conglomerate with
               clasts of Cannery Formation on S.Admiralty I.;
               marine
 
    Formation: Insular Terrane
                  Craig Subterrane of Alexander Terrane
                       P    Halleck
                       DP   Saginaw Bay
 
    Age Range: Permian
  Maximum Age: 290.0 Ma
  Minimum Age: 245.0 Ma