Oslo. Beskrivelse til kvartærgeologisk landgeneralkart.

Abstract

Marine deposits: All along the coast of Norway above the present sea level there are raised beaches, caves and terraces formed by waves. This proves that formerly the ocean reached a higher level. The highest one since the latest glacial period is called the marine limit (MG). Marine sand (red dots on a lemon ground) extends up to here, while the upper limit of marine clay lies somewhat lower. \"Ra\" is a terminal moraine, deposited in the sea, partly as gravel fans at the outlet of glacial streams. Due to surf, a ra surface always consists of stratified sand and gravel. Lake and river (also glacial) deposits are allotted the mustard colour. Fine, stratified sand is represented with the colour alone, while coarse sand and gravel is distinguished by means of fine sand coarse red dots, respectively, on a mustard ground. Fans (fan-shaped stippling) are to be seen at the glacial river outlets. Eskers are marked with red dots on the mustard ground. Glacial, non-stratified deposits: The ground moraine, till, is predominating glacial deposit. On the map there is a distinction between till rich in clay (light green) occurring in shale and limestone districts, and sandy till (deep green).