GENERAL GEOLOGY 20 dikes of various basic igneous rocks. In places it has picked up large fragments of the limestone that occurs in mass near at hand. It has contorted and twisted the bed¬ ding very much, and has formed contact minerals (esso- nite, pyroxene) in the limestone at the border. On the… … FIG. 4. DIKES IN GLACIER BAY. The limestone is determined as Carboniferous by Pro¬ fessor H. S. Williams, on the evidence of a single speci¬ men of Lonsdalia, and the tonalite must be younger, as it penetrates and alters this. It resembles closely the tonalite of Plover Bay, Siberia, and St.…
Natural history -- Alaska · Scientific expeditions · Alaska
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