{"id":267,"date":"2023-05-14T08:46:07","date_gmt":"2023-05-14T06:46:07","guid":{"rendered":"https:\/\/nationalpark.08eins-preview.ch\/fr\/flore-et-faune\/geologie\/verrucano\/"},"modified":"2024-01-02T14:48:16","modified_gmt":"2024-01-02T13:48:16","slug":"verrucano","status":"publish","type":"florafauna_cpt","link":"https:\/\/nationalpark.ch\/fr\/flore-et-faune\/verrucano\/","title":{"rendered":"Verrucano"},"content":{"rendered":"<p><strong>Le verrucano est un d\u00e9bris de la cha\u00eene de montagne qui a \u00e9t\u00e9 form\u00e9e et \u00e9rod\u00e9e bien avant les Alpes.<\/strong><\/p>\n<p>Vous connaissez peut-\u00eatre le poudingue grossier (Nagelfluh) qui est un conglom\u00e9rat de pierraille. Apr\u00e8s le plissement des Alpes, la jeune cha\u00eene de montagne a imm\u00e9diatement \u00e9t\u00e9 soumise \u00e0 l\u2019\u00e9rosion. Les torrents et rivi\u00e8res ont charri\u00e9 les d\u00e9bris en bordure des Alpes, o\u00f9 ils se sont solidifi\u00e9s en poudingue.<br \/>\nLe verrucano s&rsquo;est form\u00e9 de la m\u00eame mani\u00e8re, 200 millions d&rsquo;ann\u00e9es avant. La cha\u00eene de montagne varsique a \u00e9t\u00e9 \u00e9rod\u00e9e, comme nos Alpes actuellement, et les d\u00e9bris ont \u00e9t\u00e9 d\u00e9pos\u00e9s par les rivi\u00e8res au fond de la vall\u00e9e.<\/p>\n<p><strong>Le verrucano est form\u00e9 de gravier et de grains de sable colmat\u00e9s. La coloration rouge\u00e2tre est due au faible taux en fer.<\/strong><\/p>\n<p>Les parties blanches sont pour la plupart du quartz provenant d&rsquo;anciens graviers et de grains de sable.Si l\u2019on suit le ruisseau depuis l\u2019H\u00f4tel Parc Naziunal Il Fuorn, on observe le long du chemin des colorations violettes sur le sol, dues au verrucano. Les plus remarquables sont les blocs de verrucano \u00e0 l\u2019entr\u00e9e du Val Trupchun, pos\u00e9s dans le lit du torrent \u00e0 mi-parcours entre la place de parc Pras\u00fcras et la cabane du parc Varusch.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"template":"","class_list":["post-267","florafauna_cpt","type-florafauna_cpt","status-publish","hentry","florafauna_category-geologie","florafauna_category-roches-sedimentaires"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Verrucano - Parc National Suisse<\/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:\/\/nationalpark.ch\/fr\/flore-et-faune\/verrucano\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Verrucano - Parc National Suisse\" \/>\n<meta property=\"og:description\" content=\"Le verrucano est un d\u00e9bris de la cha\u00eene de montagne qui a \u00e9t\u00e9 form\u00e9e et \u00e9rod\u00e9e bien avant les Alpes. 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