*=;>. ea_4 — ^ 



K eween avvaii' 



I Ak ~ | 



PO ST-.ALKONI^IAX 



I ca n 



Al\E SUPERIOR REGION 



JD CRYSTALLINE ROCKS. 



i.S.and Canadiajn Surveys. 



HURONIAN 



A h The Original HUromcm.. 



Aha T/ze Mcu-quQtte -Menominee Iron -Bearing ic/usts. 



Ah 3 Thely'scol^sil^Vdaey^Slcx/es■ 



A h 4 rhe Penohee Irori.-Bearmg Schists. 



A h 5 The StZauis Slates. 



A h 6 T!te Chit!r>atva Vallev Qixartzites. 



A h7 The Blach Ru/er Iran-Bearing Schists. 



Aha The Baraboolfaarixites 



A h 9 TliC. Sioux quartxit as . 



A h 10 The A nimihie Series . 



A h II FoldedSchisisof Canada . 



ISO STAT. Ml. 



