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The Gardnos structure in Hallingdal, Norway, is a 5 km in diameter, eroded impact crater of probably late Precambrian age. Within the structure, both impactites and postimpact crater sediments are preserved. The sediments comprise a wide range of siliciclastics: (1) postimpact breccias, (2) coarse conglomerates, (3) conglomeratic sandstones, (4) sandstones, and (5) interbedded fine sandstones, silt-stones, and shales.

The sedimentary succession reveals a shifting depositional environment. The post-impact breccias covering the crater floor were deposited by rock avalanches. Directly after impact, loose rock debris slid down the crater wall and the central uplift, settling on top of the newly formed...

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