{"id":193,"date":"2020-02-04T15:51:09","date_gmt":"2020-02-04T14:51:09","guid":{"rendered":"http:\/\/eprcf33.fr\/?page_id=193"},"modified":"2025-10-22T11:00:18","modified_gmt":"2025-10-22T09:00:18","slug":"le-sous-sol-de-la-gironde","status":"publish","type":"page","link":"https:\/\/eprcf33.fr\/index.php\/le-sous-sol-de-la-gironde\/","title":{"rendered":"Le sous sol de la gironde"},"content":{"rendered":"[vc_row][vc_column][rev_slider_vc alias=\u00a0\u00bbcarrieres-et-falaises-le-sous-sol-de-la-gironde\u00a0\u00bb][\/vc_column][\/vc_row][vc_row][vc_column width=\u00a0\u00bb1\/2&Prime;][vc_column_text]\n<h2 class=\"wp-block-heading\" style=\"text-align: justify;\"><span style=\"text-decoration: underline;\"><span style=\"font-family: Roboto;\">Le sous sol de la gironde :<\/span><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-family: Roboto;\">Sur le plan g\u00e9ologique, la Gironde se situe au c\u0153ur du bassin s\u00e9dimentaire aquitain, qui couvre la majeure partie du quart sud-ouest de la France. Ce bassin correspond \u00e0 une zone d\u2019accumulation de s\u00e9diments de plusieurs kilom\u00e8tres d\u2019\u00e9paisseur provenant de l\u2019\u00e9rosion des cha\u00eenes de montagne environnantes qui a d\u00e9but\u00e9 \u00e0 l\u2019\u00e8re secondaire, il y a environ 250 Millions d\u2019ann\u00e9es.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: Roboto;\">En fonction des secteurs, les roches s\u00e9dimentaires qui sont aujourd\u2019hui \u00e0 l\u2019affleurement sont d\u2019\u00e2ge et de nature variables. Autour de la Garonne, de la Dordogne et dans le plateau de l\u2019Entre-deux-Mers, l\u2019ossature des reliefs, visible au niveau des falaises, est constitu\u00e9e d\u2019une s\u00e9rie de roches s\u00e9dimentaires d\u00e9pos\u00e9es \u00e0 l\u2019\u00e9poque oligoc\u00e8ne, il y a environ 30 Millions d\u2019ann\u00e9es, portant le nom de <em>calcaires \u00e0 Ast\u00e9ries<\/em>.<\/span><\/p>\n[\/vc_column_text][\/vc_column][vc_column width=\u00a0\u00bb1\/2&Prime;][vc_empty_space][vc_single_image image=\u00a0\u00bb2307&Prime; alignment=\u00a0\u00bbcenter\u00a0\u00bb][\/vc_column][\/vc_row][vc_row full_width=\u00a0\u00bbstretch_row\u00a0\u00bb css=\u00a0\u00bb.vc_custom_1582208223912{background-color: #efefef !important;}\u00a0\u00bb][vc_column width=\u00a0\u00bb1\/2&Prime;][vc_empty_space][vc_single_image image=\u00a0\u00bb2308&Prime; alignment=\u00a0\u00bbcenter\u00a0\u00bb][\/vc_column][vc_column width=\u00a0\u00bb1\/2&Prime;][vc_empty_space height=\u00a0\u00bb26px\u00a0\u00bb][vc_column_text text_align=\u00a0\u00bbcenter\u00a0\u00bb]\n<p style=\"text-align: justify;\"><span style=\"font-family: Roboto;\">Les calcaires <em>\u00e0<\/em> <em>Ast\u00e9ries<\/em> sont des roches carbonat\u00e9es biod\u00e9tritiques de couleur gris-blanc parfois jaun\u00e2tre d\u00e9pos\u00e9es dans un environnement marin. L\u2019appellation de la formation provient du fait que certaines des couches qui la constituent sont compos\u00e9es d\u2019innombrables d\u00e9bris fossiles provenant des osselets d\u2019\u00e9toiles de mer appel\u00e9es <em>Ast\u00e9ries<\/em>. L\u2019\u00e9paisseur totale de la formation des <em>calcaires \u00e0 Ast\u00e9ries <\/em>peut localement atteindre plusieurs dizaines de m\u00e8tres. Elle est encadr\u00e9e par des roches argileuses.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: Roboto;\">La formation des <em>calcaires \u00e0 Ast\u00e9ries<\/em> est tr\u00e8s h\u00e9t\u00e9rog\u00e8ne, elle poss\u00e8de d\u2019importantes variations de faci\u00e8s horizontales et verticales (taille des grains, types de fossiles constitutifs, etc.), qui se traduisent par une variabilit\u00e9 de porosit\u00e9, de densit\u00e9 et de r\u00e9sistance notamment. Elle poss\u00e8de \u00e9galement assez fr\u00e9quemment des pass\u00e9es argileuses et des horizons tr\u00e8s karstiques.<\/span><\/p>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space height=\u00a0\u00bb26px\u00a0\u00bb][vc_column_text]\n<p data-start=\"119\" data-end=\"685\"><span style=\"font-family: Roboto;\">D\u00e8s le XVIII\u1d49 si\u00e8cle et jusqu&rsquo;au d\u00e9but du XX\u1d49 si\u00e8cle, de nombreuses communes de Gironde situ\u00e9es au-del\u00e0 de la rive droite de la Garonne ont connu une importante activit\u00e9 d&rsquo;extraction souterraine de pierres de taille calcaires. Une partie de ces pierres fut utilis\u00e9e sur place pour la construction de b\u00e2timents individuels et communaux. La majorit\u00e9 d&rsquo;entre elles fut livr\u00e9e \u00e0 l&rsquo;agglom\u00e9ration bordelaise pour la construction de monuments, la r\u00e9novation d&rsquo;une partie du centre historique et la construction des \u00e9choppes d\u00e9sormais typiques de l&rsquo;architecture de la ville.<\/span><\/p>\n<p data-start=\"691\" data-end=\"814\"><span style=\"font-family: Roboto;\">L&rsquo;appellation \u00ab <em>pierre de Bordeaux<\/em> \u00bb est ainsi devenue courante pour d\u00e9signer la pierre extraite du sous-sol de la Gironde.<\/span><\/p>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]\n<p style=\"text-align: center;\"><span style=\"font-family: Roboto;\">La cath\u00e9drale Saint Andr\u00e9 de Bordeaux<br \/>\n<\/span><span style=\"font-family: Roboto;\">(soubassement r\u00e9alis\u00e9 en calcaire \u00e0 Ast\u00e9ries de Saint-Macaire, de Bourg et de Fronsenac)<\/span><\/p>\n[\/vc_column_text][vc_single_image image=\u00a0\u00bb864&Prime; alignment=\u00a0\u00bbcenter\u00a0\u00bb][\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][rev_slider_vc alias=\u00a0\u00bbcarrieres-et-falaises-le-sous-sol-de-la-gironde\u00a0\u00bb][\/vc_column][\/vc_row][vc_row][vc_column width=\u00a0\u00bb1\/2&Prime;][vc_column_text] Le sous sol de la gironde : Sur le plan g\u00e9ologique, la Gironde se situe au c\u0153ur du bassin s\u00e9dimentaire aquitain, qui couvre la majeure partie du quart sud-ouest de la France. Ce bassin correspond \u00e0 une&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"templates\/no-sidebar.php","meta":{"footnotes":""},"class_list":["post-193","page","type-page","status-publish","hentry","entry","no-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le sous sol de la gironde - eprcf 33 carri\u00e8res souterraines et falaises de Gironde<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eprcf33.fr\/index.php\/le-sous-sol-de-la-gironde\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le sous sol de la gironde - eprcf 33 carri\u00e8res souterraines et falaises de Gironde\" \/>\n<meta property=\"og:description\" content=\"[vc_row][vc_column][rev_slider_vc alias=\u00a0\u00bbcarrieres-et-falaises-le-sous-sol-de-la-gironde\u00a0\u00bb][\/vc_column][\/vc_row][vc_row][vc_column width=\u00a0\u00bb1\/2&Prime;][vc_column_text] Le sous sol de la gironde : Sur le plan g\u00e9ologique, la Gironde se situe au c\u0153ur du bassin s\u00e9dimentaire aquitain, qui couvre la majeure partie du quart sud-ouest de la France. 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