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Koninckia Leonhardi, Wissmann. a. Ventral view. Part of ventral valve removed to show the vascular impressions of dorsal valve. b. Interior of dorsal valve, showing spiral processes restored. c. Vertical section of both valves. About 600 species of invertebrate fossils occur in the Hallstadt and St. COLUMN 1: COMMON TO OLDER ROCKS. Orthoceras. Bactrites. Macrocheilus. Loxonema. Holopella.
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