Editing Greywacke (section)

== In geology and geography ==

Greywackes are abundant in [[Wales]], the south of [[Scotland]], the Longford-Down Massif<ref>{{cite web |title=The Geological Heritage of County Longford |url=https://gsi.geodata.gov.ie/downloads/Geoheritage/Reports/Longford_Audit.pdf |access-date=25 October 2022 |publisher=The County Longford Geological Heritage Project}}</ref> in [[Ireland]] and the [[Lake District National Park]] of [[England]]; they compose the majority of the main [[Southern Alps]] that make up the backbone of [[New Zealand]]. Both feldspathic and lithic greywacke have been recognized in [[Ecca Group]] in [[South Africa]].<ref>{{Cite journal |last1=Baiyegunhi |first1=Christopher |last2=Liu |first2=Kuiwu |last3=Gwavava |first3=Oswald |date=2017-10-28 |title=Modal composition and tectonic provenance of the sandstones of Ecca Group, Karoo Supergroup in the Eastern Cape Province, South Africa |journal=Open Geosciences |volume=9 |issue=1 |pages=491–508 |bibcode=2017OGeo....9...38B |doi=10.1515/geo-2017-0038 |issn=2391-5447 |doi-access=free}}</ref> Greywackes are also found in parts of the [[Eastern Desert]] east of the [[Nile]].<ref name=":0">{{Cite web |title=Ancient Egyptian Materials: Greywacke (schist) |url=http://www.hallofmaat.com/ancient-egyptian-materials-greywacke-schist/ |access-date=2023-09-01 |website=www.hallofmaat.com}}</ref>

They were an early object of geological study in Britain where the [[Geological Society of London|Geological Society]] was founded in 1807, and excited much public interest in geology.<ref name="BB80">{{cite book |last1=Bryson |first1=Bill |title=A Short History of Nearly Everything |date=October 27, 2009 |publisher=Crown |page=80 |edition=Kindle |access-date=July 24, 2022 |quote=In 1839, when Roderick Murchison published The Silurian System, a plump and ponderous study of a type of rock called greywacke, it was an instant best seller...|url=https://www.penguinrandomhouse.com/books/20549/a-short-history-of-nearly-everything-special-illustrated-edition-by-bill-bryson/}}</ref> Greywacke was interesting because it was found in many places in Britain and its occurrence in particular places was evidence of the pattern of [[Stratum|geological strata]] that had been laid down.<ref>{{cite book |last1=Bryson |first1=Bill |title=Short History of Nearly Everything |publisher=Crown |page=85 |edition=Kindle |quote=Martin J. S. Rudwick’s excellent and somber account of the issue, The Great Devonian Controversy.}}</ref><ref name="Davidson">{{cite book |last1=Davidson |first1=Nick |title=The greywacke: how a priest, a soldier and a schoolteacher uncovered 300 million years of history |date=2021 |publisher=Profile Books |location=London |isbn=1788163788}}</ref>