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Page 13 text:
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Stromatolites, Sibley Group, Disraeli Lake, near Nipigon, Ontario. Stromatolites grow in a near shore or intertidal zone. These belong to the genus Conophytum and are 1350 million years old. Mushroom shaped concretion. Rove formation, Tnunder Bay group, near Pass Lake, Ontario. These concretions have grown diagenetically, and contain possible organic material. They are composed of cal cite . Tightly folded bands of chert-magnetite iron formation in an Algoman Iron Formation, Kaministiquia, Ontario.
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Page 12 text:
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Olivine diabase dyke in the Coldwell complex. Algal reef, Gunfiint formation. Thunder Bay Group, near Schreiber, Ontario. These reefs have grown on boulders which form the basal conglomerate of the formation. They contain blue-green algae, and are, at 1.65 billion years, one of the oldest known life forms. Thinly laminated limey mudstone beds, Sibley Group, near Rossport, Ontaiio. Note soft sediment folding. 10
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Page 14 text:
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Sam V Chromite opaque grains, within a serpent ini zed ultrabasic lock. In tne cavities of the chromite some lelics of primary olivine and pyroxene may be found. The fractures in the chromite grains indicate a serpentinization of the surrounding rock with a slight increase in volume. (45 N, Mid Atlantic Ridge) Diabase dredged close to the M.A.R. A rough intersertal structure is formed by coarse microlites of plagioalase and interstitial pyroxene. Probably belonging to a thick flow, or a shallow sill. (45 N on the Mid Atlantic Ridge, 1200 fins) This specimen is a serpentinized dunite. A tiny fracture in the specimen was invaded by a fora minifera ooze, and the walls of the fissure are coated by dendritic Mn and Re oxides. (From 45 N, on the Mid Atlantic Ridge, 1300 fms dep) A quickly chilled basalt, with radiating thin microlites of feldspar, within an opaque hematite stained glassy matrix. Small angular grains of olivine are visible. Note the hollow transversal sections of the feldspatic microlite. (From 45 N, Mid Atlantic Ridge, 1200 fms deep] 12
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