Riverton-pale-green-argillite_W640

Green argillite from Riverton Aparima. Source: http://www.researchgate.net/publication/275213606_The_use_of_Southland_Argillite_in_New_Zealand_Prehistory_distribution_chronology_and_form?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6Il9kaXJlY3QiLCJwYWdlIjoicHVibGljYXRpb24ifX0