Det centrale Norges fjeldbygning
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Forkortet: By Central Norway is here meant the three great valleys Østerdal, Gudbrandsdal and Valdres with their surroundings. In the district around lake Mjøsa there are opportunities for studying the differnt characteristics of the structure of the earth's crust in the different kinds of soft rocks which the Silurian etages or groups of strata consist and in the thicker and harder beds of sand- stone and sparagmite; in the former the foldings are characteristic, in the latter fracture planes or faults; inversion are common, but the greater overthrusts have not been detected (p.31). The pre-Cambrian strata in the Mjøsa district consist of the following divisions from above: (Ollenellus shales)\/ Quartz-sandstone-goup\/. The light (colored) Sparagmite with conglomerate.\/Birikalk (limestone)\/Biri.conglomerate\/.The Dark Sparagmite and shales.