Straight cut
A directional cut or directional profile is an artificial outcrop of a sequence of layers of sedimentary rocks that was created specifically as a reference profile for a stratigraphic boundary. The term originally comes from mining geology and especially from Ruhr coal mining. In a sedimentary sequence suitable for a directional cut, the neighboring stratigraphic units can be easily delimited from one another, depending on the type of stratigraphic boundary to be defined. In the case of a lithostratigraphic boundary, the neighboring units should primarily be petrographically (lithological), and in the case of a chronostratigraphic boundary primarily biostratigraphically easy to distinguish from one another.
Probably the best-known directional cut in Germany is the Wetteldorfer directional cut , which was created as a reference profile for the Emsium - Eifelium boundary and has been the GSSP of this boundary since 1982 .
Individual evidence
- ^ Hans Murawski, Wilhelm Meyer: Geological dictionary. 12th edition. Spektrum Akademischer Verlag, 2010, ISBN 978-3-8274-1810-4 , p. 139.
- ↑ GSSP Wetteldorfer Richtschnitt (Ems / Eifel border) on the website of the Senckenberg Institute; accessed on September 10, 2017.
- ↑ Frank Auffenberg: A world-famous piece of the Eifel: Why almost every geologist knows Wetteldorf. Trierischer Volksfreund from February 4, 2015.