{"id":4467,"date":"2025-11-23T16:54:06","date_gmt":"2025-11-23T16:54:06","guid":{"rendered":"https:\/\/lamolineuvoise.fr\/Blog\/?page_id=4467"},"modified":"2025-12-27T13:38:13","modified_gmt":"2025-12-27T13:38:13","slug":"la-grotte-d-orchaise","status":"publish","type":"page","link":"https:\/\/lamolineuvoise.fr\/blog\/la-grotte-d-orchaise\/","title":{"rendered":"La grotte d&rsquo;Orchaise"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"4467\" class=\"elementor elementor-4467\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5b6660ac elementor-section-height-min-height elementor-section-boxed elementor-section-height-default elementor-section-items-middle\" data-id=\"5b6660ac\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;video&quot;,&quot;shape_divider_bottom&quot;:&quot;opacity-tilt&quot;,&quot;background_video_link&quot;:&quot;https:\\\/\\\/lamolineuvoise.fr\\\/Blog\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Grotte_Orchaise-1.mp4&quot;,&quot;background_play_on_mobile&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-background-video-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<video class=\"elementor-background-video-hosted\" role=\"presentation\" autoplay muted playsinline loop><\/video>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-shape elementor-shape-bottom\" aria-hidden=\"true\" data-negative=\"false\">\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 2600 131.1\" preserveAspectRatio=\"none\">\n\t<path class=\"elementor-shape-fill\" d=\"M0 0L2600 0 2600 69.1 0 0z\"\/>\n\t<path class=\"elementor-shape-fill\" style=\"opacity:0.5\" d=\"M0 0L2600 0 2600 69.1 0 69.1z\"\/>\n\t<path class=\"elementor-shape-fill\" style=\"opacity:0.25\" d=\"M2600 0L0 0 0 130.1 2600 69.1z\"\/>\n<\/svg>\t\t<\/div>\n\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-4b9361bb\" data-id=\"4b9361bb\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-450e74d5 elementor-widget elementor-widget-heading\" data-id=\"450e74d5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">La grotte d'Orchaise<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-1182b93\" data-id=\"1182b93\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-497166f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"497166f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-bc88ed2\" data-id=\"bc88ed2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b372b46 elementor-widget elementor-widget-heading\" data-id=\"b372b46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Caract\u00e9ristiques<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ecf2e0e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ecf2e0e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-98d9b46\" data-id=\"98d9b46\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5cbad01 elementor-widget elementor-widget-image\" data-id=\"5cbad01\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/IMG_0932-768x1024.jpg\" class=\"attachment-large size-large wp-image-6823\" alt=\"\" srcset=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/IMG_0932-768x1024.jpg 768w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/IMG_0932-225x300.jpg 225w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/IMG_0932-1152x1536.jpg 1152w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/IMG_0932-1536x2048.jpg 1536w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/IMG_0932-scaled.jpg 1920w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3cc7616 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3cc7616\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4f37858\" data-id=\"4f37858\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-53dc977 elementor-widget-tablet__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"53dc977\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p align=\"justify\">La grotte d&rsquo;Orchaise ou grotte de la Fontaine, par son ampleur inhabituelle dans notre r\u00e9gion, attire depuis des si\u00e8cles la curiosit\u00e9 du passant. On trouve en effet dans des \u00e9crits datant du Moyen-\u00c2ge des r\u00e9f\u00e9rences \u00e0 la grotte qui \u00e9tait alors exploit\u00e9e afin d&rsquo;en extraire la \u00ab\u00a0terre sigill\u00e9e\u00a0\u00bb aux vertus m\u00e9dicinales tomb\u00e9es depuis en d\u00e9su\u00e9tude, mais fort appr\u00e9ci\u00e9es \u00e0 l&rsquo;\u00e9poque. Toutefois, les premiers r\u00e9cits connus de son exploration ne datent que du d\u00e9but du XIX\u00e8me si\u00e8cle (1825). En 1894, F. Robert publie une premi\u00e8re description de la grotte jusqu&rsquo;\u00e0 210 m\u00e8tres de l&rsquo;entr\u00e9e. Au cours des d\u00e9cennies qui suivirent de nombreux sp\u00e9l\u00e9ologues s&rsquo;int\u00e9ress\u00e8rent \u00e0 la grotte dont le c\u00e9l\u00e8bre Norbert Casteret. Mais c&rsquo;est \u00e0 Jean Mauvisseau, animateur du centre sp\u00e9l\u00e9o des scouts de France, et \u00e0 Philippe Renault que l&rsquo;on doit l&rsquo;inventaire le plus complet de la grotte r\u00e9alis\u00e9 en 1943. A ce jour, la galerie principale est explor\u00e9e jusqu&rsquo;\u00e0 435 m\u00e8tres de l&rsquo;entr\u00e9e au point terminal gr\u00e2ce notamment \u00e0 la pers\u00e9v\u00e9rance et \u00e0 l&rsquo;opini\u00e2tret\u00e9 des sp\u00e9l\u00e9o-club de Blois et d&rsquo;Orl\u00e9ans. Au total, 1175 m\u00e8tres de galeries parfois resserr\u00e9es en boyaux tr\u00e8s \u00e9troits ont \u00e9t\u00e9 inventori\u00e9s, ce qui place la grotte de la Fontaine d&rsquo;Orchaise au deuxi\u00e8me rang des cavit\u00e9s de la r\u00e9gion Centre apr\u00e8s la fontaine souterraine de Parc\u00e9 sur la commune de Saint George sur Cher.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fa8e7a1 elementor-widget elementor-widget-text-editor\" data-id=\"fa8e7a1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/lamolineuvoise.fr\/Blog\/wp-content\/uploads\/2025\/11\/RiviereSouterraineOrchaise_JMauvisseau_PhRrenault.pdf\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3129\" src=\"https:\/\/lamolineuvoise.fr\/Blog\/wp-content\/uploads\/2024\/01\/pdf_logo.gif\" alt=\"\" width=\"50\" height=\"63\" \/> <\/a>La rivi\u00e8re souterraine d&rsquo;Orchaise par J. Mauvisseau et Ph. Renault<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-409fd4a elementor-align-center elementor-widget elementor-widget-button\" data-id=\"409fd4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.geologie41.cdpne.org\/images_pdf_sites\/Site8\/8.pdf\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Document du CDPNE41<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9618de6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9618de6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-647dddd\" data-id=\"647dddd\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c38ed88 elementor-widget elementor-widget-heading\" data-id=\"c38ed88\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Contexte g\u00e9ologique <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5e7421f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5e7421f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-842e286\" data-id=\"842e286\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e1d1ba3 elementor-widget elementor-widget-image\" data-id=\"e1d1ba3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/elementor\/thumbs\/GrotteOrchaise_ProfilLong-rf52u1sebwko2l9k2cqxif9wxq5zqyuu4k8xb59w2y.jpg\" title=\"GrotteOrchaise_ProfilLong\" alt=\"GrotteOrchaise_ProfilLong\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d917c45 elementor-widget elementor-widget-text-editor\" data-id=\"d917c45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La grotte de la Fontaine s&rsquo;est form\u00e9e au cours de l&rsquo;\u00e8re secondaire au sein des formations de la craie\u00a0<a href=\"https:\/\/fr.wikipedia.org\/wiki\/S%C3%A9nonien\" target=\"_blank\" rel=\"noopener\">s\u00e9nonienne <\/a>que l&rsquo;on peut observer \u00e0 l&rsquo;affleurement dans les coteaux de la vall\u00e9e de la Cisse entre Saint-Lubin et Coulanges. Sa pr\u00e9sence est directement li\u00e9e \u00e0 la tectonique de l&rsquo;<a href=\"https:\/\/www.geologie41.cdpne.org\/Site7.html\" target=\"_blank\" rel=\"noopener\">anticlinal d&rsquo;Herbault<\/a>\u00a0qui, en se soulevant, provoqua la fissuration de la roche et favorisa ainsi l&rsquo;\u00e9coulement en profondeur des eaux de ruissellement puis le d\u00e9veloppement d&rsquo;un r\u00e9seau karstique engendr\u00e9 par l&rsquo;action \u00e9rosive de l&rsquo;eau. Ce r\u00e9seau karstique, dont le d\u00e9veloppement a pu \u00eatre d\u00e9montr\u00e9 lors de la r\u00e9alisation de forages men\u00e9e le plateau, constitue le p\u00e9rim\u00e8tre d&rsquo;alimentation de la Fontaine d&rsquo;Orchaise.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-61deca0 e-flex e-con-boxed e-con e-parent\" data-id=\"61deca0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ea021c1 elementor-widget elementor-widget-image\" data-id=\"ea021c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/elementor\/thumbs\/GrotteOrchaise_ProfilEnLong-01-scaled-rf6hk11iro79wcxfmn688n7oaa5anlv8ibjl81vlsy.png\" title=\"GrotteOrchaise_ProfilEnLong-01\" alt=\"GrotteOrchaise_ProfilEnLong-01\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0fd2620 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0fd2620\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-54eec5c\" data-id=\"54eec5c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1581748 elementor-widget elementor-widget-heading\" data-id=\"1581748\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Description de la grotte<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1dacb06 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1dacb06\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f7f5a47\" data-id=\"f7f5a47\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a63e802 elementor-widget elementor-widget-image\" data-id=\"a63e802\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"611\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte_orchaise_PLAN-1024x611.jpg\" class=\"attachment-large size-large wp-image-6969\" alt=\"\" srcset=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte_orchaise_PLAN-1024x611.jpg 1024w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte_orchaise_PLAN-300x179.jpg 300w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte_orchaise_PLAN-768x459.jpg 768w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte_orchaise_PLAN-1536x917.jpg 1536w, https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte_orchaise_PLAN-2048x1223.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-28a4223 elementor-widget elementor-widget-text-editor\" data-id=\"28a4223\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La grotte d&rsquo;Orchaise comporte deux \u00e9tages, l&rsquo;\u00e9tage inf\u00e9rieur dans lequel s&rsquo;\u00e9coule la rivi\u00e8re et qui correspond \u00e0 la grotte de la Fontaine et un \u00e9tage sup\u00e9rieur dit de la cave aux Renards dont l&rsquo;entr\u00e9e, peu visible depuis le chemin qui longe la Cisse, est dissimul\u00e9e par la v\u00e9g\u00e9tation du coteau.<\/p>\n<p>Parfois totalement \u00e9loign\u00e9s l&rsquo;un de l&rsquo;autre et parfois en superposition \u00e9troite, ces deux galeries ne forment qu&rsquo;une m\u00eame entit\u00e9. La cave aux Renards correspond en effet \u00e0 un \u00e9tage fossile de la grotte dans le sens o\u00f9 cet \u00e9tage serait le premier \u00e0 s&rsquo;\u00eatre form\u00e9, le conduit inf\u00e9rieur de la Fontaine r\u00e9sultant d&rsquo;un creusement post\u00e9rieur. La cave aux Renards d&rsquo;une hauteur de 1,8m \u00e0 l&rsquo;entr\u00e9e, se resserre rapidement pour n&rsquo;\u00eatre plus qu&rsquo;un boyau \u00e9troit au diam\u00e8tre inf\u00e9rieur \u00e0 0,8m qui s&rsquo;ach\u00e8ve \u00e0 87m de l&rsquo;entr\u00e9e.<\/p>\n<p>La galerie de la grotte de la Fontaine mesure 8 m\u00e8tres de hauteur et environ 2 m\u00e8tres de largeur \u00e0 son entr\u00e9e. Un barrage en b\u00e9ton, \u00e9rig\u00e9 au XIXe si\u00e8cle pour les besoins en eaux de la commune,\u00a0 vient obstruer partiellement la galerie et rend la progression extr\u00eamement difficile en raison de la mont\u00e9e des eaux dont la profondeur atteint 2 m\u00e8tres \u00e0 l&rsquo;arri\u00e8re du barrage.<\/p>\n<p>Apr\u00e8s une progression sur une cinquantaine de m\u00e8tres, on rencontre un premier \u00e9boulis d&rsquo;argile \u00e0 silex, puis un deuxi\u00e8me quelques dizaines de m\u00e8tres plus loin. A partir de l\u00e0, la galerie devient de plus en plus chaotique avec des amas rocheux qui jonchent le sol. A 245m de l &lsquo;entr\u00e9e se trouve une petite salle, puis un peu plus loin, deux salles contigu\u00ebs de plus grande ampleur se d\u00e9veloppant sur environ 15m de longueur et 2 \u00e0 4m de hauteur. Ces deux salles pr\u00e9sentent la particularit\u00e9 d&rsquo;\u00eatre tapiss\u00e9es d&rsquo;une \u00e9paisseur importante de guano provenant des d\u00e9jections de myriade de chauve-souris qui occupaient autrefois les lieux. Apr\u00e8s ces deux salles, la progression est encore possible au prix d&rsquo;une reptation dans des conduits tr\u00e8s \u00e9troits et caillouteux jusqu&rsquo;\u00e0\u00a0435m\u00a0de l&rsquo;entr\u00e9e marquant le terme des explorations. Il semble que l&rsquo;on soit l\u00e0 au terminus de la grotte, n\u00e9anmoins les sp\u00e9l\u00e9ologues conservent bon espoir de d\u00e9couvrir encore d&rsquo;autres passages qui seraient actuellement obstru\u00e9s par des \u00e9boulis d&rsquo;argile. Gageons que la grotte n&rsquo;a pas encore livr\u00e9 tous ses secrets<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3278209 elementor-widget elementor-widget-text-editor\" data-id=\"3278209\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<iframe src=\"https:\/\/macarte.ign.fr\/carte\/VNZcZZ\/La-Grotte-d-Orchaise\" width=\"100%\" height=\"480px\" allow=\"geolocation clipboard-read; clipboard-write\"><\/iframe>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-cc20b7e e-flex e-con-boxed e-con e-parent\" data-id=\"cc20b7e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-281d6c7 elementor-widget elementor-widget-heading\" data-id=\"281d6c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Utilisation de la source de la Fontaine<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0e5085d e-flex e-con-boxed e-con e-parent\" data-id=\"0e5085d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4ad48fb elementor-widget elementor-widget-text-editor\" data-id=\"4ad48fb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Au d\u00e9but du XX<sup>\u00e8m\u00e8<\/sup> si\u00e8cle, une partie de l&rsquo;alimentation en eau du bourg d&rsquo;Orchaise provenait de la source de la Fontaine. Afin de remonter l&rsquo;eau jusqu&rsquo;au village situ\u00e9 plus de 60m au dessus de la source, la commune d&rsquo;Orchaise disposait d&rsquo;un\u00a0b\u00e9lier hydraulique\u00a0qui a fonctionn\u00e9 jusqu&rsquo;au d\u00e9but des ann\u00e9es 1950. Ce dispositif avait la particularit\u00e9 de n&rsquo;utiliser que l&rsquo;\u00e9nergie naturelle du courant d&rsquo;eau. Bien \u00e9videmment les d\u00e9bits de refoulement n&rsquo;avaient rien de commun avec ce que l&rsquo;on peut obtenir avec des pompes \u00e9lectriques modernes, c&rsquo;est la raison pour laquelle ce dispositif ing\u00e9nieux n&rsquo;est pratiquement plus utilis\u00e9 de nos jours.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-226b69e elementor-align-center elementor-widget elementor-widget-button\" data-id=\"226b69e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/infoterre.brgm.fr\/viewer\/MainTileForward.do\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Consulter la base InfoTerre du BRGM<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a5e384 elementor-widget elementor-widget-heading\" data-id=\"8a5e384\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">Le b\u00e9lier hydraulique<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-96c44a7 elementor-widget elementor-widget-text-editor\" data-id=\"96c44a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le b\u00e9lier hydraulique est un dispositif permettant de pomper de l&rsquo;eau \u00e0 une certaine hauteur sans autre \u00e9nergie que la force de la m\u00eame eau. C&rsquo;est une invention de Joseph Michel Montgolfier, celui qui construisit avec son fr\u00e8re, Jacques \u00c9tienne, le premier ballon \u00e0 air chaud. Joseph Michel Montgolfier eut l&rsquo;id\u00e9e en 1796, d&rsquo;utiliser le ph\u00e9nom\u00e8ne du coup de b\u00e9lier pour l&rsquo;appliquer \u00e0 un m\u00e9canisme simple pour le pompage de l&rsquo;eau \u00e0 destination de la papeterie familiale \u00e0 Voiron.<br \/>Le coup de b\u00e9lier est ce ph\u00e9nom\u00e8ne connu : quand on ferme brusquement un robinet, la canalisation, du fait de l&rsquo;arr\u00eat de l&rsquo;\u00e9coulement, subit un choc qui se traduit souvent par un bruit. Dans les grosses installations, du fait de la quantit\u00e9 d&rsquo;eau en mouvement, on doit imp\u00e9rativement \u00e9viter ce ph\u00e9nom\u00e8ne qui provoquerait immanquablement l&rsquo;\u00e9clatement des canalisations..<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f2e0b03 e-flex e-con-boxed e-con e-parent\" data-id=\"f2e0b03\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-5fef047 e-con-full e-flex e-con e-child\" data-id=\"5fef047\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-de847ba elementor-widget elementor-widget-image\" data-id=\"de847ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"259\" height=\"211\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte1.gif\" class=\"attachment-large size-large wp-image-6819\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b81bfbd elementor-widget elementor-widget-text-editor\" data-id=\"b81bfbd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Sch\u00e9ma 1<\/strong>\u00a0: La conduite d&rsquo;arriv\u00e9e d&rsquo;eau (1) doit \u00eatre aliment\u00e9e en permanence par une eau en mouvement (force cin\u00e9tique). De cette force d\u00e9pend la capacit\u00e9 de \u00a0pompage. Le b\u00e9lier est constitu\u00e9 d&rsquo;une conduite d&rsquo;arriv\u00e9e (1), d&rsquo;une soupape primaire (4), d&rsquo;une conduite de d\u00e9part (3) avec une soupape secondaire (5), une cloche remplie d&rsquo;air au d\u00e9part (6).<br \/>Au d\u00e9but du fonctionnement\u00a0 l&rsquo;eau arrive par la conduite et s&rsquo;\u00e9chappe \u00e0 l&rsquo;ext\u00e9rieur du dispositif ; sa vitesse augmente et la soupape (4) se ferme.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3d2872e e-con-full e-flex e-con e-child\" data-id=\"3d2872e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-44e8ece elementor-widget elementor-widget-image\" data-id=\"44e8ece\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"261\" height=\"211\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte2.gif\" class=\"attachment-large size-large wp-image-6820\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c24539f elementor-widget elementor-widget-text-editor\" data-id=\"c24539f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Sch\u00e9ma 2<\/strong>\u00a0: le coup de b\u00e9lier se produit \u00e0 la fermeture de la vanne, l&rsquo;autre soupape \u00a0(5) s&rsquo;ouvre. L&rsquo;eau monte dans la cloche (6) et y comprime l&rsquo;air.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dfce873 e-con-full e-flex e-con e-child\" data-id=\"dfce873\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1f6155f elementor-widget elementor-widget-image\" data-id=\"1f6155f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"263\" height=\"211\" src=\"https:\/\/lamolineuvoise.fr\/blog\/wp-content\/uploads\/2025\/11\/Grotte3.gif\" class=\"attachment-large size-large wp-image-6822\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c9d2830 elementor-widget elementor-widget-text-editor\" data-id=\"c9d2830\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Sch\u00e9ma 3<\/strong>\u00a0: l&rsquo;air de la cloche atteint une pression qui fait se refermer la soupape (5), l&rsquo;eau est projet\u00e9e dans la conduite de sortie. Pendant, ce temps, la soupape (4) est \u00a0rouverte et le cycle recommence.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d59b73d e-flex e-con-boxed e-con e-parent\" data-id=\"d59b73d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d49fd09 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"d49fd09\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.geologie41.cdpne.org\/Site8.html\" target=\"_blank\" rel=\"nofollow\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Voir l'article sur le site du CDPNE 41<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>La grotte d&rsquo;Orchaise Caract\u00e9ristiques La grotte d&rsquo;Orchaise ou grotte de la Fontaine, par son ampleur inhabituelle dans notre r\u00e9gion, attire depuis des si\u00e8cles la curiosit\u00e9 du passant. On trouve en [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"right-sidebar","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"unboxed","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ngg_post_thumbnail":0,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":""},"class_list":["post-4467","page","type-page","status-publish","hentry"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"LA MOLINEUVOISE","author_link":"https:\/\/lamolineuvoise.fr\/blog\/author\/a_2meen\/"},"uagb_comment_info":0,"uagb_excerpt":"La grotte d&rsquo;Orchaise Caract\u00e9ristiques La grotte d&rsquo;Orchaise ou grotte de la Fontaine, par son ampleur inhabituelle dans notre r\u00e9gion, attire depuis des si\u00e8cles la curiosit\u00e9 du passant. On trouve en [&hellip;]","_links":{"self":[{"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/pages\/4467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/comments?post=4467"}],"version-history":[{"count":44,"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/pages\/4467\/revisions"}],"predecessor-version":[{"id":7376,"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/pages\/4467\/revisions\/7376"}],"wp:attachment":[{"href":"https:\/\/lamolineuvoise.fr\/blog\/wp-json\/wp\/v2\/media?parent=4467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}