Terrane Unit : HA Name : Harrison Description : Jurassic island-arc volcanics and clastics. Carbonate clasts in Toarcian conglomerate contain Permian fossils similar to those in the Chilliwack Terrane. Amalgamated in the Jurassic and accreted to the continental margin in the Cretaceous. Assemblages : JHL Harrison Lake Plutonic Rocks : None Age Range: Lower - Middle Jurassic Maximum Age: 208.1 Ma Minimum Age: 157.1 Ma