The ore deposits of Utah . 12 CHARACTERISTIC FOSSILS OF SILURIAN AND DEVONIAN AGE. 1-10, Devonian; II, 12, Silurian. 1,2, Penlamenis lotis Walcoll; 3, 4, ,5, Martinia maia (Rillinfjs); 6, 7. Dalmanilos meekiWalcott; 8, Atrypareticularis (Linnainis); 9, 10, Spirifer pinoneusis Meek; 11, Favosites favosus Goldfuss; 12, Couchidiumdeciissatum Whiteaves. Figures 3 and 4 represent young shells. U. S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 111 PLATE X.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou