Middle Jurassic (Bajocian) Eastern Oregon
Middle Jurassic (Bajocian) Eastern Oregon
Middle Jurassic (Bajocian) Eastern Oregon
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GEOLOGICAL SURVEY<br />
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473-693 0- 73 - 11<br />
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SONNINIA (EUHOPLOCERAS) AND PLANAMMATOCERAS?<br />
PROFESSIONAL PAPER 756 PLATE 24