Tute marl
The term marl marl (also known as nail lime and in older literature as marl lime or marl ) describes a morphological appearance in marl rocks that gives the impression of nested cones.
The term goes back to the mineralogist Friedrich Hausmann (1814). At around the same time, this phenomenon was also described by Abraham Gottlob Werner (1749-1817) under the name Dutenkalk .
The formation of the cone-like structure, which resembles the cone, to which the name of these phenomena is owed, is explained by early diagnostic processes in which temperature changes, evaporation and degassing play a role, which have contributed to the segregation of calcareous, humus marl. Cross wrinkles can often be observed on the marl, which can leave the (false) impression of organic (fossil) structures. On the layered surfaces of the cones, a nail-head-like structure caused by weathering sometimes appears, which is why the term nail lime found its way into literature.
See also
literature
- Heilwig Leipnitz, Carla Möller: Pseudo or mock fossils. In: Arbeitskreis Paläontologie Hannover, magazine for amateur paleontologists. Vol. 11, No. 4, 1983, pp. 1-15, PDF; 3.5 MB (complete booklet), p. 5.
- Hans Murawski, Wilhelm Meyer: Geological dictionary. 12th edition. Spektrum Akademischer Verlag, 2010, ISBN 978-3-8274-1810-4 , p. 175.
- Werner Schulz: Geological guide for the north German bed load collector. Publishing group, Schwerin 2003, ISBN 3-933781-31-0 .
- Bertram G. Woodland: The nature and origin of cone-in-cone structure. In: Fieldiana: Geology. Vol. 13, No. 4, Chicago 1964, PDF; 8.7 MB .