{"id":15,"date":"2016-11-10T11:14:54","date_gmt":"2016-11-10T11:14:54","guid":{"rendered":"https:\/\/www.devon.gov.uk\/geology\/?page_id=15"},"modified":"2024-11-08T15:01:50","modified_gmt":"2024-11-08T15:01:50","slug":"devons-rocks-a-geological-guide","status":"publish","type":"page","link":"https:\/\/www.devon.gov.uk\/geology\/devons-rocks-a-geological-guide\/","title":{"rendered":"Devon&#8217;s rocks: a geological guide"},"content":{"rendered":"<p>This webpage contains guides to 13 different rock types found in Devon. We hope you find the information provided is appropriate for your requirement, either for leisure or study. Different levels of information are provided, which are designed for those with a general interest in rocks, along with more advanced technical descriptions.<\/p>\n<p>Click on the map to enlarge, click on the rock name in the key below to open a PDF which contains:<\/p>\n<ul>\n<li>a basic description of the rock type<\/li>\n<li>a more technical explanation of the geology<\/li>\n<li>photographs of the rock type<\/li>\n<li>how the rock type has been used<\/li>\n<li>recommendations of where the rock type can be visited.<\/li>\n<\/ul>\n<h3>Summary map of the geology of Devon<\/h3>\n<p><a href=\"https:\/\/www.devon.gov.uk\/geology\/wp-content\/uploads\/sites\/117\/2016\/11\/geology-map.gif\"><img decoding=\"async\" class=\"wp-image-30 alignnone\" src=\"https:\/\/www.devon.gov.uk\/geology\/wp-content\/uploads\/sites\/117\/2016\/11\/geology-map-576x600.gif\" alt=\"Devon geology map\" width=\"551\" height=\"574\" srcset=\"https:\/\/www.devon.gov.uk\/geology\/wp-content\/uploads\/sites\/117\/2016\/11\/geology-map-576x600.gif 576w, https:\/\/www.devon.gov.uk\/geology\/wp-content\/uploads\/sites\/117\/2016\/11\/geology-map-288x300.gif 288w, https:\/\/www.devon.gov.uk\/geology\/wp-content\/uploads\/sites\/117\/2016\/11\/geology-map-640x666.gif 640w\" sizes=\"(max-width: 551px) 100vw, 551px\" \/><\/a><\/p>\n<div class=\"table-scroll\"><table class=\" alignleft\" style=\"width: 100.012%; height: 668px;\" width=\"100%\">\n<tbody>\n<tr>\n<th scope=\"col\">Rock type<\/th>\n<th scope=\"col\">Map key<\/th>\n<th scope=\"col\">Rock type continued<\/th>\n<th scope=\"col\">Map key continued<\/th>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/ESKNQNTVKgZKu5osfS1nqfEBxv3VmOxQMJTZP6I-jqKHrg?e=Cj0D5J\" rel=\"noopener\">Quaternary Deposits and Landforms<\/a><\/td>\n<td style=\"width: 0.88968%; text-align: left;\">These recent deposits are not on the map<\/td>\n<td style=\"width: 25.546%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EREc-JjIWChMtDhoYk0I_rwB-ajCC11SDwiFxxjRw5SZ-g?e=MSdsfQ\" rel=\"noopener\">Permian Breccias, Sandstones and Volcanics<\/a><\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-571\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-permianbreccias.gif\" alt=\"Geo Permian breccias\" width=\"75\" height=\"55\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EXdhzFKtLmVDmfCxi7W_Q_ABwMR3RV9WbK2m8Ws4bAoVkA?e=lCcCiP\" rel=\"noopener\">Tertiary Deposits<\/a><\/td>\n<td style=\"width: 0.88968%;\">\u00a0<img decoding=\"async\" class=\"alignleft wp-image-563\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-tertiarydeposits.gif\" alt=\"Geo Tertiary deposits\" width=\"70\" height=\"52\" \/><\/td>\n<td style=\"width: 25.546%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/Ecs2fSVcVJ1CogRo-OFklTQBXc-wc3Is769X_KgBsUYBYA?e=02JCop\" rel=\"noopener\">Dartmoor Granite<\/a><\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-572 size-full\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-dartmoorgranite.gif\" alt=\"Geo Dartmoor Granite\" width=\"77\" height=\"57\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EUp-lHBqjohAmfyY0f6ZCsoBah1EoTKleiwO_IRzBPSCeQ?e=FJKiUw\" rel=\"noopener\">Lundy Granite<\/a><\/td>\n<td style=\"width: 0.88968%;\"><img decoding=\"async\" class=\"alignleft wp-image-566\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-lundygranite.gif\" alt=\"geo Lundy Granite\" width=\"69\" height=\"51\" \/><\/td>\n<td style=\"width: 25.546%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EdXo_XVCn-tErE3_dmf7BPMBX54V0VU1zJY87HWuEKM1sQ?e=s56jhf\" rel=\"noopener\">Carboniferous Sandstones and Shales<\/a><\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-573 size-full\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-carboniferoussandstonesshales.gif\" alt=\"Geo carboniferous sandstones and shales\" width=\"77\" height=\"57\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/Ecm65RtDyAZHhGPT5dcBRSwB-xR0PgQEI2_Im3RBOJcmmg?e=Jdf4BC\" rel=\"noopener\">Chalk<\/a><\/td>\n<td style=\"width: 0.88968%;\">\u00a0<img decoding=\"async\" class=\"alignleft wp-image-567\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-chalk.gif\" alt=\"Geo Chalk\" width=\"69\" height=\"51\" \/><\/td>\n<td style=\"width: 25.546%;\">Transition Group (Devonian to Carboniferous boundary)<\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-574 size-full\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-transitiongroup.gif\" alt=\"Geo transition group\" width=\"77\" height=\"57\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/Ed2eiR23vSxHgMBtHwecbOQBsefWd7gBKH3Bw-KXt90w-g?e=AUXeuX\" rel=\"noopener\">Upper Greensand and Gault<\/a><\/td>\n<td style=\"width: 0.88968%;\">\u00a0<img decoding=\"async\" class=\"alignleft wp-image-568\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-uppergreensandgault.gif\" alt=\"Geo upper greensand gault\" width=\"70\" height=\"52\" \/><\/td>\n<td style=\"width: 25.546%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EWZVjIXl7S9IkartWUuwH_MBUcATh869o5RDv9c7TfA46g?e=kwDmkh\" rel=\"noopener\">Devonian Slates, Sandstones and Volcanics<\/a><\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-575 size-full\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-devonianslatessandstonesvolcanics.gif\" alt=\"geo Devonian slates, sandstones and volcanics\" width=\"77\" height=\"57\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/ESnFuWoyBaJGtB2MVVGpE9QBpdQuv85-TlUKksbTLqsfFw?e=bNyAbO\" rel=\"noopener\">Lower Jurassic Mudstones and Limestones<\/a><\/td>\n<td style=\"width: 0.88968%;\">\u00a0<img decoding=\"async\" class=\"alignleft wp-image-569\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-lowejurassicmudstoneslimestones.gif\" alt=\"geo lower Jurassic mudstones limestones\" width=\"70\" height=\"52\" \/><\/td>\n<td style=\"width: 25.546%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EffBSM3MGaRKninnBQEtmLIB0b_Wp8NTzESCoysfofriwQ?e=WxTnod\" rel=\"noopener\">Devonian Limestones<\/a><\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-576 size-full\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-devonianlimestones.gif\" alt=\"Geo Devonian Limestones\" width=\"77\" height=\"57\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 21.4191%; text-align: left;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EUIkYzDwjZlFn2XKzYy8VPYBXRxnk9LbtnaVr9DCMTZjBw?e=5WZac6\" rel=\"noopener\">Triassic Pebble Beds, Sandstones and Mudstones<\/a><\/td>\n<td style=\"width: 0.88968%;\">\u00a0<img decoding=\"async\" class=\"alignleft wp-image-570\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-triassicpebblebeds.gif\" alt=\"Geo triassic pebblebeds\" width=\"69\" height=\"57\" \/><\/td>\n<td style=\"width: 25.546%;\"><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/Ebs8--h5P2BPpSk_YLJpBOYBgSw3fdAFGtqA-vbXbzJk_A?e=R6LW6q\" rel=\"noopener\">Lower Devonian Schists<\/a><\/td>\n<td style=\"width: 4.09755%;\"><img decoding=\"async\" class=\"alignleft wp-image-577 size-full\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/geo-lowerdevonianschists.gif\" alt=\"Geo Lower Devonian schists\" width=\"77\" height=\"57\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n<p>An <a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/Efk_lOk8IkJAiQliHDTsUo8B_3shes-nn5KrG54IogPMPw?e=grOF4z\" rel=\"noopener\">Introduction to the Geology of Devon<\/a> travels back in time and summarises the history and variety of geology in Devon. A document called <a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/EV3rQD_4ZwJAucG1KnXZ5DwBjBSHGpTNi4bFAkpD7praLw?e=Dz2jqA\" rel=\"noopener\">Devon&#8217;s Rocks &#8211; A Geological Guide<\/a>\u00a0provides a compilation of all 13 rock type guides. The <a href=\"https:\/\/www.devon.gov.uk\/geology\/educational-register-of-geological-sites-in-devon\/\">Educational Register of Geological Sites<\/a> is designed to encourage the educational use of Devon\u2019s fascinating and diverse geological and geomorphological heritage.<\/p>\n<h3>Visiting geological sites<\/h3>\n<ul>\n<li><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/ETxmL6snhJBHvmZ6EG73i0ABSG98bGtLB21oVA1V3ZjAJw?e=ZHZ3tv\" rel=\"noopener\">Discover Devon Geology Booklet<\/a><\/li>\n<li><a href=\"https:\/\/devoncc.sharepoint.com\/:b:\/s\/PublicDocs\/Environment\/Eau0-jQ6L0lOnipVE6lv6XoBOeEia9jiipsV-qksqmhEeQ?e=ep4d3d\" rel=\"noopener\">Safety when Visiting Sites of Geological Interest\u00a0<\/a><\/li>\n<\/ul>\n<div class=\"table-scroll\"><table class=\"fixtable\" style=\"height: 110px;\" border=\"0\" summary=\"\" width=\"726\">\n<tbody>\n<tr valign=\"top\">\n<td style=\"width: 54px;\" valign=\"top\"><img decoding=\"async\" class=\"wp-image-592 aligncenter\" src=\"https:\/\/www.devon.gov.uk\/wp-content\/uploads\/sites\/112\/2016\/11\/devon-rigs.gif\" alt=\"devon-rigs\" width=\"110\" height=\"257\" \/><\/td>\n<td style=\"width: 353px;\" valign=\"top\">The information on this page was developed in celebration of the International Year of Planet Earth in partnership with the Devon RIGS Group. The 13 guides to the rock types were written by a team of consultants within David Roche GeoConsulting. The basic description sections have been subsequently edited by Devon County Council.<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>This webpage contains guides to 13 different rock types found in Devon. We hope you find the information provided is appropriate for your requirement, either for leisure or study. Different levels of information are provided, which are designed for those &hellip; <a href=\"https:\/\/www.devon.gov.uk\/geology\/devons-rocks-a-geological-guide\/\" aria-label=\"Continue reading Devon&#8217;s rocks: a geological guide\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":602,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-15","page","type-page","status-publish","hentry"],"acf":[],"publishpress_future_action":{"enabled":false,"date":"2026-06-01 05:07:35","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/pages\/15","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/users\/602"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/comments?post=15"}],"version-history":[{"count":10,"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/pages\/15\/revisions"}],"predecessor-version":[{"id":311,"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/pages\/15\/revisions\/311"}],"wp:attachment":[{"href":"https:\/\/www.devon.gov.uk\/geology\/wp-json\/wp\/v2\/media?parent=15"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}