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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.
Thus, for example, the Ammonite, which is not common to older rocks, is represented by no less than seventy-three species; whereas Loxonema, which is only known as common to older rocks, furnishes fifteen Triassic species. Cerithium, so abundant in tertiary strata, and which still lives, is represented by no less than fourteen species.
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