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Greywacke should probably be regarded as deprecated in favor of terms with a genetic implication. Most rocks that were labeled greywackes are probably turbidites -- that is, rocks formed of sediments deposited by turbidity currents. 69.9.146.66 08:03, 20 December 2005
Could whoever posted the original link find another suitable collection of images and edit the link accordingly?-- kikumbob ( talk) 10:56, 6 August 2009 (UTC)
Does Greywacke have natural cleavage planes like sandstone or siltstone? Is it metamorphic in nature? -- Virgil H. Soule ( talk) 06:01, 27 September 2009 (UTC)
The article says greywackes are more common in Paleozoic, particularly Cambrian and Silurian (but not do much Ordovician?). Is there speculation as to why? Were the continental shelves--or the dropoff from them--steeper back then? Mcswell ( talk) 15:26, 18 April 2021 (UTC)
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Is it "greywake" or "graywhack" or "graywacky"? in ipa: greɪweɪk or greɪwæk or greɪwækə Help:IPA/Introduction OsamaBinLogin ( talk) 19:07, 22 April 2018 (UTC)