Geological overview map of Lower Saxony 1 : 500 000
Description
The geological overview map 1 : 500,000 gives a nationwide overview of the geological structure of Lower Saxony. The line information also includes information on the extent of various glaciations, the coastline of the North Sea in the Quaternary and tectonic structures.
The mountains of southern Lower Saxony are built up by the solid rocks of the Paleozoic and Mesozoic periods. In the Harz and near Osnabrück, the Paleozoic basement is exposed. The oldest rock is the presumably precambrian Eckergneiss. The sediments of a paleozoic sea basin follow over a layer gap. In it black slate, in the Devonian sandstone, roof slate, threshold and reef limestone were sold; In the Upper Devonian and Lower Carboniferous, the Harz greywackens were poured. Basaltic lavas, today's diabase, emerged at the bottom of the sea. In connection with this, silica slate and iron ores were created. The entire sequence of layers was unfolded during the Varist mountain formation in the Upper Carboniferous; Finally, magmatic melts rose, which are now exposed in the Harzburg gabbro, in the Brocken and Oker granite.
In the Rotliegende, the excavation debris accumulated in sinks of the mountains. The Zechstein Sea flooded an already leveled terrain and covered it with powerful consequences of lime, gypsum or anhydrite and salt.
In the Mesozoic period, the shallow, temporarily dry basin was filled with the sediments of the Triassic (coloured sandstone, shell limestone and keuper), in the Jurassic and Cretaceous period, the basin was flooded by the sea again. The mesozoic layer stack shattered at a time of tectonic unrest (upper Jurassic to chalk) due to profound disturbances. The plastically reacting Zechstein salt rose on them. The result is the saxonic fracture folding of the overburden.
In the Tertiary, the sea once again flooded the leveled terrain and deposited sand and clay, while inland lignite temporarily formed. Eventually, the sea retreated to what is now the North Sea area.
The Quaternary is characterized by a multiple change of cold and warm periods. In the Middle Pleistocene, large parts of Lower Saxony were glaciated during the Elster and Saale glaciations; the ice left behind ground moraines (slide gel) and meltwater deposits (gravel, sand and clay). During the interglacial and post-glacial periods (Holocene), peat, mudden and marl were formed. Parts of the coastal area were flooded and covered by marine, mudflat and brackish water deposits.
Resources
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=64&Service=WFS&Request=GetCapabilities& |
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=64&Service=WMS&Request=GetCapabilities& |