Elvdal. Beskrivelse til kvartærgeologisk kart 2018 III - M 1:50 000 (med fargetrykt kart)

Abstract

The superficial deposits consists mainly of sandy basal till\r and gravelly-sandy ablation till. The glaciofluvial and fluvial\rsediments are mainly gravelly. The lithology of the fine gravel and the\r mineralogy of sand and clay show that the till is to a large extent\r locally derived. Contents of available plant nutrients are extremely\r low. Shallow fens cover large areas on the plains and basins. Deeper\r bogs are in areas hummocky ablation till. The mountains (above 950 m\r a.s.l.) were ice-free and covered with a pineer vegetation at least\r 8400 years B.P. The last buried ice-remnants in the valleys had melted\r in the interval from 8000 to 7000 years B.P. Pinus and Betula forests\r have been dominant throughout Holocene time. Alnus (incana) replaced\r the Quercetum Mixtum forests of the southern lowlands during the\r Atlantic chronozone. Picea expansion occurred approximately 1700 years\r B.P. The geochemical distribution of lead (Pb) in stream sediments and\r till is discussed. A short description of ares with similar geological\r and ecological features is presented. On this basis, four landscape\r types have been distinguished. A brief discussion follows on presentday\r land and possible future development.