Numerous people have assisted the authors in the several years during which this research was carried out. These contributions were extremely helpful, listed in relation to sites, as follows. Malvern Hills: David Ray (Neftex);John Nicklin, Margaret Rodway, and Lucy Cornelius of Teme Valley Geological Society. Wenlock Edge: managers of Lea and Coates Quarries on Wenlock Edge; David Walker (West Midlands). Wren's Nest: Natural England, Graham Worton, Robert Earnshaw. For all Wenlock sites in the Midland Platform: Victor Colter (ex-British Gas) and John Powell (ex-British Geological Survey) were most helpful. Isle of Man: Stephen Crowley, University of Liverpool. National Museum of Wales, Cardiff: Cindy Howell and Caroline Buttler. Natural History Museum, London: Richard Turney. Sedgwick Museum, Cambridge: Matthew Riley. Oxford Museum of Natural History: Eliza Howlett. Girvan area: Alan Owen (Glasgow-University) and Sarah Stewart (National Museum of Scotland). National Museum of Ireland: the late Matthew Parkes. Frank Brunton (Ontario Geological Survey) is thanked for help with access to some references. Simon Schneider (CASP, Cambridge) is thanked for German translation; Davit Vasilyan (Porrentruy, Switzerland) and Sergei Lazarev (Lausanne University, Switzerland) are thanked for Russian translation. Manuscript reviewer Carl Stock (Colorado) is greatly thanked for meticulous reading and comments on the script; and editors Yves Candela, Peter Crowther, and Benjamin Moon are thanked for their great efforts in bringing this work to publication. ACDS would like to thank the Belgian Science Foundation Grant T.0051.19-PDF. Unless stated otherwise, copyright of illustrations belongs to the authors.
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