What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
abundant actinolite alteration amphibole Analysis Animikie Archean basal bedding Birch Lake Biwabik Biwabik formation cent chloritic conglomerate containing cummingtonite deposits described developed diabase drift Duluth east erosion feet feldspar ferric ferrous iron ferrous silicate ferruginous chert fine-grained folding fragments gabbro Geol Geological Survey Giants range glacial glauconite grains granite graywacke green granules greenalite granules griinerite Gunflint Lake hematite Hise horizon hornblende Huronian rocks intrusion iron carbonate iron formation iron oxide Iron Range iron-bearing formation iron-formation Keweenawan Lake Superior Lake Superior region layers limonite Lower Huronian granite magnetite matrix Mesabi district Mesabi iron Mesabi range metamorphism microscope minerals mining Minnesota Mountain Iron observed original paint rock pebbles Penokee-Gogebic district phases Pokegama Falls Pokegama quartzite porphyritic portion quartz schists sedimentary sediments shown siderite silica specimen strata structure surface Test pit thickness unconformably Upper Huronian series Vermilion Virginia slate Winchell
From Google Scholar
Carlos A Rosière, Farid Chemale Jr
Raymond Bartlett Earle - 1914 - Annals of the New York Academy of Sciences