Pfohsand

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Pfohsand is the gray, mica-bearing , silty fine to medium sand of the Upper Freshwater Molasse (tOS) from the Upper Miocene . The parabroun earth made of mica sand , as the mixture is also described, was created after the end of the Ice Age , when a large freshwater lake covered the Upper German plateau, and this finely ground alpine debris settled in the geosyncline (depression) of the northern foothills of the Alps up to several thousand during the Tertiary Meters of thickness.

Etymologically, the defining word of the composition Pfohsand contains a dialect form of the Old High German word "foha", as it is still today in the hobby in " Fah ", meaning "female red fox ". The foxes build their burrows in this fine, loose sand.

The pile sand, which is often solidified by lime, was probably pressed so hard by very large and long-lasting water pressure that it is very stable even when it is hollowed out. Up until the last century, small vaulted cellars were dug in its layers in many places using a shovel and pick. To ventilate it, the ceiling was pierced vertically and the opening at the top was covered with a kind of chimney hat. These cellars were u. a. used for the storage of potatoes and beets. You can find them e.g. B. in Rottumtal near Mietingen and Bad Saulgau (see Friedberger Erdkeller ), but also near Weiler in the district of Ravensburg .

In addition to the term Pfohsand, the terms bird , purging or alluvial sand can also be found in different regions .

Individual evidence

  1. ↑ Upper freshwater molasses (tOS). In: Peter Wagenplast: Engineering geological hazards in Baden-Württemberg. ( Memento from May 26, 2012 in the Internet Archive ) (= State Office for Geology, Raw Materials and Mining. Information 16). (PDF; 2.7 MB). ed. from the regional council of Freiburg State Office for Geology, Raw Materials and Mining. Freiburg im Breisgau October 2005, p. 16.
  2. ↑ Ludwig Schülli, Oskar Vogel, Siegfried Müller, Gerhard Schlenker, Jörg Werner: Reestablishment in the arid region of the Upper Rhine: An economic and cultural task. (= Publication series of the state forest administration Baden-Württemberg)
  3. ^ Georg Wagner : Geology of Southwest Germany. Munich 1961.
  4. ↑ cosmos. Volume 71, No. 1/75, Verlag Kosmos, Gesellschaft der Naturfreunde, Stuttgart 1975, p. 188.
  5. ↑ Gustav Kempf: The village of Göggingen (characteristics). In: Ders .: The Gögginger Dorfbuch . Municipality of Göggingen, Göggingen 1971, pp. 1–2, here p. 1.
  6. ↑ Michael Richard Buck: Oberdeutsches Flurnamenbuch: an alphabetically arranged guide for friends of German language and cultural history, especially for educated forestry and agriculture. Kohlhammer 1880.
  7. ↑ The Basin of Lake Constance: A physical sketch by Professor Rogg. In: August Petermann: Mittheilungen from Justus Perthes' geographical institute about important new researches in the total area of ​​geography. Volume 9, 1863, pp. 1–13, here p. 3.
  8. ↑ Stefan Ott: Upper Swabia: Face of a Landscape. Verlag O. Maier, 1972, p. 16.
  9. ↑ Horst Eichler: The pre-worm period Pleistocene between the crack and the upper Rottum: a contribution to the stratigraphy of the northeastern Rhine glacier area. (= Heidelberg geographical works. Issue 30). Geographical Institute of Heidelberg University, 1970.

literature

  • Karl Beurlen, Horst Gall, Gerhard Schairer: The Alb and its fossils: geology and palaeontology of the Swabian and Franconian Alb; a guide for the lover. Bindlach 1992, ISBN 3-8112-0976-0 .
  • Kurt Lemcke: Geology of Bavaria. Volume 1: The Bavarian Alpine Foreland before the Ice Age. Geological history - construction - mineral resources . Stuttgart 1988, ISBN 3-510-65135-9 .
  • J. Koch: Site and forest history studies. Silviculture and operation. 1963.
  • J. Koch: Investigations on the growth of spruce stands in the area of ​​different location units in northern Upper Swabia. 1955.
  • GA, Krauss, R. Olberg: Zeil. Location, forest and forest management in the Fürstl. Waldburg-Zeil'schen Forst (old moraine area of ​​the Württ. Alpine foothills). A. Basics of location and forest history. 2. Landscape, climate, geology and soil. 1953.
  • Hansjörg Oeschger : Douglas fir cultivation in Baden-Württemberg: with special consideration of historical development. (= Series of publications by the Baden-Württemberg State Forest Administration. Volume 45). Stuttgart 1975.
  • F. Wenk: The geological past. 1963.