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On the whole, the rich marine fauna of Hallstadt and St. It will be recognised by planters that apart from the personal factor in tapping, the worker might be so unfortunate as to be placed in an area from which the yield is naturally low, either by reason of its youth or from other natural causes. Middle Neocomian-- Punfield Marine bed, Tealby beds, middle part of Speeton clay: Part of Wealden beds of Kent, Surrey, Sussex, Hants, and Dorset. Both lenses have their convex surfaces toward the object glass, and their distance apart is equal to half the sum of their focal lengths.