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... Introduction.  Subdivision of Precambrian time-_-__-_--___ Lower Precambrian rocks. Older granite gneiss and included bodies of quartzite and schist Dickinson group East Branch arkose-___-_---__-_Solberg schist..__ Six-Mile Lake amphibolite.-____-_----_ Hardwood gneiss. Quinnesec formation.  Post-Dickinson gneissic granite_.____---____ Middle Precambrian rocks. Chocolay group Menominee group ___ Pace 27 Middle Precambrian rocks Continued 27 Baraga group. 28 Goodrich quartzite._  31 Hemlock formation  Fence River formation._ 31 Amasa formation__  31 Michigamme slate.  31 Badwater greenstone  32 Paint River group___ 32 Dunn Creek slate 32 Riverton iron-formation  32 Hiawatha graywacke. 33 Stambaugh formation  33 Fortune Lakes slate.____.___ 35 Middle Precambrian igneous rocks 35 References cited-__--__.__ Index. Page 35 36 36 36 36 37 37

Stratigraphy of pre-Keweenawan rocks in parts of northern Michigan