Sunndalsøra 1420 III. Beskrivelse til kvartærgeologisk kart - M 1 : 50 000 (med fargetrykt kart).
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The superficial deposits within the map-sheet are described and genetically classified. Tills are the dominating sediments, but considerable amounts of glaciofluvial and fluvial deposits also occur. Slide and talus deposits occur widely in the valleys and weathering material blockfield is present in the higher areas. The oldest described ice striations probably represent a regional ice movement towards the northwest. This northwesterly ice movement was followed by other ice movements controlled mostly by the regional topograph during the folloving deglaciation. During both periods of glaciation diverging striae provide evidence for the existence of local culmination aeras in the mountains within the map-sheet Sunndalsøra. The progress of the moraine ridges in the Reinsvatnet area indicates the existence of an event, the Reinsvatn event. This event is thought to be of Younger Dryas age. The highest marine level during the deglaciation in Sunndalen occurs at some 145 m a.s.l. Radio carbon dating of shells found in glaciomarine clay indicates that Litledalen was deglaciated 9,740\u00B1250 C-years B.P.(T-4516).