What is the meaning of Graywacke?

(n.) A conglomerate or grit rock, consisting of rounded pebbles sand firmly united together.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). graywacke. Retrieved October 1, 2026, from http://smartdefine.org/graywacke/definitions/2013576
ChicagoWebster's. 2011. "graywacke" http://smartdefine.org/graywacke/definitions/2013576 (accessed October 1, 2026).
HarvardWebster's 2011, graywacke, Smart Define, viewed 1 October, 2026, <http://smartdefine.org/graywacke/definitions/2013576>.
MLAWebster's. "graywacke" 27 May 2011. Web. 1 October 2026. <http://smartdefine.org/graywacke/definitions/2013576>