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Date: 2003-11-17 11:08:00Graptolithinia Hemichordates Barf Plate tectonics Ordovician Didymograptus Avalonia Skiddaw Group Geology Historical geology Geology of Wales | Add to Reading ListSource URL: www.sssi.naturalengland.org.ukDownload Document from Source WebsiteFile Size: 60,42 KBShare Document on Facebook |