Talk:Greywacke

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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


 * Turbidites aren't rock types though - they're formations, sequences. I just finished dealing with a turbidite sequence that was made up of both greywackes and other rock types. If you take a hand sample of greywacke out of a Turbidite formation, it's still a Greywacke. So the name really deserves to stand,particularly when it's still turning up in Textbooks 30 years after Turbidites were first described. Weebs 03:57, 31 January 2007 (UTC)

The External Link to Greywacke Images No Longer Exists
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)

Cleavage Planes?
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)

Why Paleozoic?
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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Pronounciation?
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)


 * The Concise Oxford and Chambers Twentieth Century dictionaries (1996 & 1972) say the word is pronounced with a final vowel (either a or i), and describe it as "partially translated, partially adopted" from the German word Grauwacke. "Gray" is an American version of "grey." NRPanikker (talk) 13:07, 25 August 2022 (UTC)