a nonporous, dark-colored sandstone containing angular particles of other rocks
2.
a fine-grained conglomerate resembling sandstone
Word origin
partial transl. of Ger grauwacke: see gray1 &
Examples of 'graywacke' in a sentence
graywacke
The sandstones are named lithic arenite, lithic graywacke, feldspathic lithareniteand litharenite.
A. Müjdat Özkan 2002, 'Petrographic characteristic of the sandstones of the upper paleocene-middle eoceneaged in the Yildizli-Aydinkent (Ereğli-Konya) area', Pamukkale University Journal of Engineering Scienceshttp://dergipark.ulakbim.gov.tr/pajes/article/view/5000089825. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
However, when catchment's moisture conditions are high, an ephemeral source from clay shale-graywacke dominated forested sites becomes active.
Natalie Orlowski, Florian Lauer, Philipp Kraft, Hans-Georg Frede, Lutz Breuer 2014, 'Linking Spatial Patterns of Groundwater Table Dynamics and Streamflow GenerationProcesses in a Small Developed Catchment', Waterhttp://www.mdpi.com/2073-4441/6/10/3085. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)