Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1972, Page 20

Náttúrufræðingurinn - 1972, Page 20
Illa. Vikurlög austan í Tjörfafelli. Hamarinn stend- ur í miðju þrískiptu vikur- lagi, sem kom upp í tengsl- um við Dómadalshraun. Neðsti hlutinn er líparít, miðkaflinn basalt, en efsti hlutinn blandaður einkum í efri helmingi (efst til hægri). — Pumic layers on the east slope of Tjörfafell. The hammer lies in the middle of a pumice layer derived from the nearby source of Dómadalshraun. The lowest part of this layer is rhyolitic the central part basaltic and the uppermost part is com- posile. Illb. Vikurbingur undir miðhrauninu í Hrafntinnuskerjum. Vikurinn er líklega sá sami og ljósi liluti landnámslagsins. — Coarse rhyolitic tephra below the largest of the Hrafntinnusker rhyolite flows. lt probably represents the light part of the „settlement layer“ near its source.

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Náttúrufræðingurinn

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