Syker Geest

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L 338 towards Harpstedt (right in the background). The darker spots of the floodplain sediments or peat in the lighter sand loess are clearly visible.

The Syker Geest is a natural spatial main unit within the natural spatial greater region of the Central North German Lowland. It extends from Syke in the north to Sulingen in the south and is part of the natural area of ​​the Ems-Hunte-Geest . Parts of the Syker Geest are part of the Wildeshauser Geest Nature Park .

location

The old moraine landscape is separated by the Huntetal from the Delmenhorster Geest to the west and the Cloppenburger Geest , borders the Thedinghauser Vorgeest in the north and the Diepholzer Moorniederung in the south . To the east it slopes down with a steep bank to the Middle Weser Valley .

Natural space

The surface is predominantly made up of sand loess of varying thickness and in the lowlands by floodplain sediments and peat . This aquifer lies on a loamy ground moraine , the impact of backwater is relatively high here. This is why there are numerous waterworks in the area, especially on the edge of the Geest . Waters of low hardness are pumped which, after iron removal, have a favorable quality for drinking water use . The formerly widespread grasslands on such sites were drained and turned into arable land. Almost three quarters of the area is used for arable farming and is structured by small forests and woods. The proportion of grassland is small and limited to the lowlands. The forest share is approx. 13% with the largest part consisting of coniferous and mixed forests . Deciduous forests are rare.

The Hohe Berg lies on the northern edge of the Syker Geest, and is the highest point around Bremen in the eastern part of the Syker district of Ristedt . The southernmost tip of the Syker Geest is represented by the Steyerberger terminal moraines ( Eickhofer Heide ) north of Steyerberg with the Heisterberg mountains up to 89  m high . In the central Geest area, on the other hand , the relief energy is very low, in the east towards the Weser , somewhat stronger than in the western part. The surface is quite even and not very steep. It is characterized by a large number of small lowlands that run from the south-southeast to the north-northwest. The main direction of this valley direction deviates by about 70 ° from the northeast - southwest direction of the valleys of the adjacent geest areas. It is assumed that the NNW-SSE-oriented structures are older and that they were preserved from the later south-west flowing glaciers by an ice mass left behind from the early phase of the Older Saale advance .

geology

The surface of from silty - argillaceous sediments mainly of Miocene existing Tertiary sediments varies greatly between deep cuts of about 100 m and bulges of 10 m below the ground level. As a result, the hanging Pleistocene loose sediments have different thicknesses. The Quaternary layer sequence begins with sediments from the Elster Glaciation . They consist of an average of 30 to 70 m (locally over 150 m) thick series of partly silty fine sands, in which locally thin silt lentils or coarse sand layers are inserted. The content of mica and glauconite is characteristic of this series . The Elsterzeit sediments are overlaid by mostly coarse-grained meltwater sands from the Saale glacial period , which occasionally have gravel or silt inclusions. The thickness is between under 10 to 30 m. This is followed by the Drenthestadial boulder clay of 3 to 10 m thickness, the sand loess finally forming the end. Especially on the Geestrand, the Quaternary deposits were compressed by the pressure and movement of the glaciers.

Nature reserves

As part of the biotope mapping , primarily the lowlands and floodplains of the small streams were recorded in this landscape and the Delmetal north of Harpstedt was reported as an FFH biotope.

Web links

Individual evidence

  1. ↑ Publications of the Lower Saxony Office for State Planning and Statistics: New Archive for Lower Saxony, Edition 18 . W. Dorn, Hannover 1950, p. 480
  2. ↑ Jürgen Ehlers : The Ice Age . Springer, Berlin 2011, p. 73

Coordinates: 52 ° 48 '  N , 8 ° 51'  E