{"id":9568,"date":"2015-12-05T19:39:47","date_gmt":"2015-12-06T00:39:47","guid":{"rendered":"http:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity.jpg"},"modified":"2015-12-14T18:29:00","modified_gmt":"2015-12-14T23:29:00","slug":"5_erosional__unconformity","status":"inherit","type":"attachment","link":"https:\/\/all-geo.org\/highlyallochthonous\/2015\/12\/a-highly-allochthonous-advent-calendar\/5_erosional__unconformity\/","title":{"rendered":"5th December &#8211; a Carboniferous erosional unconformity"},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"class_list":["post-9568","attachment","type-attachment","status-inherit","hentry"],"description":{"rendered":"<p class=\"attachment\"><a href='https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-300x225.jpg\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-300x225.jpg 300w, https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-600x450.jpg 600w, https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-900x675.jpg 900w, https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity.jpg 1200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n"},"caption":{"rendered":"<p><strong>Chris:<\/strong> Perhaps the most memorable place we visit on the trip to the Gorge Metropark is <a href=\u201c\u201chttps:\/\/en.wikipedia.org\/wiki\/Mary_Campbell_Cave#\/media\/File:Mary_Campbell_Cave_1.jpg\u201d\u201d>Mary Campbell Cave<\/a>, a dramatic natural overhang formed from the <a href=\u201chttps:\/\/all-geo.org\/highlyallochthonous\/?attachment_id=9564\u201d>Sharon Conglomerate<\/a>. You have to delve right into the depths of the overhang to find the really interesting part: a contact with an underlying shale unit. The fact that the contact clearly undulates across the width of the cave is strong evidence of an erosional unconformity. Across this contact, a lot of time is missing: enough time for tectonic uplift to change the calm, deep waters recorded by the shale below, to the much shallower and energetic waters that laid down the conglomeratic sandstones above.<\/p>\n<p>In the present day, the transition from permeable sandstones above to impermeable shales below also means that a lot of groundwater is flowing out of the cliff at the contact.<\/p>\n<p><strong><a href=\"https:\/\/all-geo.org\/highlyallochthonous\/2015\/12\/a-highly-allochthonous-advent-calendar\/\">Return to the Advent Calendar<\/a><\/strong> <a href=\"https:\/\/all-geo.org\/highlyallochthonous\/2015\/12\/a-highly-allochthonous-advent-calendar\/5_erosional__unconformity\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n"},"alt_text":"","media_type":"image","mime_type":"image\/jpeg","media_details":{"width":1200,"height":900,"file":"2015\/12\/5_Erosional__Unconformity.jpg","sizes":{"thumbnail":{"file":"5_Erosional__Unconformity-150x150.jpg","width":150,"height":150,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-150x150.jpg"},"medium":{"file":"5_Erosional__Unconformity-300x225.jpg","width":300,"height":225,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-300x225.jpg"},"large":{"file":"5_Erosional__Unconformity-600x450.jpg","width":600,"height":450,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-600x450.jpg"},"wptouch-new-thumbnail":{"file":"5_Erosional__Unconformity-144x144.jpg","width":144,"height":144,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-144x144.jpg"},"post-thumbnail":{"file":"5_Erosional__Unconformity-940x198.jpg","width":940,"height":198,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-940x198.jpg"},"foundation-featured-image":{"file":"5_Erosional__Unconformity-900x675.jpg","width":900,"height":675,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity-900x675.jpg"},"full":{"file":"5_Erosional__Unconformity.jpg","width":1200,"height":900,"mime_type":"image\/jpeg","source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity.jpg"}},"image_meta":{"aperture":0,"credit":"","camera":"","caption":"","created_timestamp":0,"copyright":"","focal_length":0,"iso":0,"shutter_speed":0,"title":"","orientation":0}},"post":9523,"source_url":"https:\/\/all-geo.org\/highlyallochthonous\/wp-content\/uploads\/2015\/12\/5_Erosional__Unconformity.jpg","filename":"5_Erosional__Unconformity.jpg","filesize":988836,"_links":{"self":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/media\/9568","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/media"}],"about":[{"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/types\/attachment"}],"author":[{"embeddable":true,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/comments?post=9568"}],"wp:attached-to":[{"embeddable":true,"post_type":"post","id":9523,"href":"https:\/\/all-geo.org\/highlyallochthonous\/wp-json\/wp\/v2\/posts\/9523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}