{"id":55726,"date":"2015-06-05T07:27:13","date_gmt":"2015-06-05T05:27:13","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=55726"},"modified":"2015-06-05T07:27:13","modified_gmt":"2015-06-05T05:27:13","slug":"les-plus-vieux-outils-du-monde-ont-33-millions-dannees","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2015\/06\/05\/les-plus-vieux-outils-du-monde-ont-33-millions-dannees\/","title":{"rendered":"Les plus vieux outils du monde ont 3,3 millions d&rsquo;ann\u00e9es"},"content":{"rendered":"<p><span style=\"color: #000080;\"><strong>La d\u00e9couverte des plus vieux outils de pierre taill\u00e9e au monde s&rsquo;est faite au Kenya. Des outils de pierre taill\u00e9e, vieux de 3,3 millions d&rsquo;ann\u00e9es.<\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\">Alors que la communaut\u00e9 scientifique a longtemps suppos\u00e9 que les premiers outils de pierre avaient \u00e9t\u00e9 fabriqu\u00e9s par le genre <em>Homo<\/em>,  cette d\u00e9couverte montre qu&rsquo;un autre genre d&rsquo;hominid\u00e9, peut-\u00eatre une  forme d&rsquo;australopith\u00e8que beaucoup plus ancienne, avait d\u00e9j\u00e0 toutes les  capacit\u00e9s n\u00e9cessaires \u00e0 la fabrication d&rsquo;outils.<\/span><\/p>\n<p><span style=\"color: #000080;\"> <\/span><\/p>\n<div id=\"textContenu\">\n<p><span style=\"color: #000080;\">Le lac Turkana, situ\u00e9 au nord du Kenya, regroupe de  nombreux sites arch\u00e9ologiques datant de 700 000 ans \u00e0 plus de trois  millions d&rsquo;ann\u00e9es. <\/span><\/p>\n<p><span style=\"color: #000080;\">Ces sites livrent des outils des plus primitifs aux  plus perfectionn\u00e9s. Depuis trente ans, des recherches men\u00e9es dans le  cadre de la Mission pr\u00e9historique au Kenya et du \u00ab West Turkana  Archaeological Project \u00bb, ont permis de reconstituer l&rsquo;\u00e9volution  technique de la taille de la pierre au cours du temps, essentielle pour  mieux comprendre les capacit\u00e9s cognitives et motrices des premiers  hominid\u00e9s.<\/span><\/p>\n<p><span style=\"color: #000080;\">Les nouveaux vestiges trouv\u00e9s par les chercheurs sur la rive  occidentale du lac Turkana datent de 3,3 millions d&rsquo;ann\u00e9es et font  instantan\u00e9ment reculer de 700 000 ans l&rsquo;apparition des premiers outils  de pierre taill\u00e9e, les plus anciens retrouv\u00e9s jusqu&rsquo;\u00e0 pr\u00e9sent, en  Ethiopie, datant de 2,6 millions d&rsquo;ann\u00e9es. <\/span><\/p>\n<p><span style=\"color: #000080;\">Ces nouveaux outils mis au  jour sont en majorit\u00e9 des blocs de lave, lourds et volumineux, qui ont  servi \u00e0 produire des \u00e9clats tranchants au moyen d&rsquo;une technique dite sur  enclume. <\/span><\/p>\n<p><span style=\"color: #000080;\">Cette technique n\u00e9cessite trois objets bien distincts : le  bloc \u00e0 tailler, un percuteur et une enclume. Le bloc est maintenu sur  l&rsquo;enclume par une main pendant que l&rsquo;autre utilise le percuteur pour  frapper et obtenir des \u00e9clats tranchants \u00e0 partir du bloc. <\/span><\/p>\n<p><span style=\"color: #000080;\">D&rsquo;autres  outils ont \u00e9t\u00e9 \u00e9labor\u00e9s gr\u00e2ce \u00e0 une technique diff\u00e9rente, dite \u00ab sur  percuteur dormant \u00bb : le bloc \u00e0 tailler est directement percut\u00e9 sur  l&rsquo;enclume. Malgr\u00e9 l&rsquo;aspect rudimentaire de ces outils, la vaste panoplie  d&rsquo;objets retrouv\u00e9e sur le site (\u00e9clats, enclumes, percuteurs, nucl\u00e9us<sup>2<\/sup>), indique clairement que l&rsquo;intention de ces hominid\u00e9s \u00e9tait bien de cr\u00e9er des outils.<\/span><\/p>\n<p><span style=\"color: #000080;\">La r\u00e9gion du Turkana \u00e9tant tr\u00e8s volcanique, la datation du site, et  indirectement de ces pierres taill\u00e9es, a \u00e9t\u00e9 r\u00e9alis\u00e9e notamment par  t\u00e9phrostratigraphie, une technique qui revient \u00e0 dater par des proc\u00e9d\u00e9s  physico-chimiques les couches de cendres intercal\u00e9s avec les s\u00e9diments  dans lesquelles sont emprisonn\u00e9s les outils.<\/span><\/p>\n<p><span style=\"color: #000080;\"> Les chercheurs ont doubl\u00e9  leurs mesures avec la m\u00e9thode du pal\u00e9omagn\u00e9tisme qui consiste \u00e0 pr\u00e9lever  des s\u00e9diments autour des outils et \u00e0 mesurer leur polarit\u00e9 (celle-ci  d\u00e9pend de l&rsquo;orientation du champ magn\u00e9tique terrestre, variable en  fonction des \u00e9poques). <\/span><\/p>\n<blockquote><p><span style=\"color: #000080;\"><br \/>\n<\/span> <strong><span style=\"color: #000080;\"><br \/>\nCette d\u00e9couverte, qui r\u00e9volutionne nos  connaissances sur l&rsquo;\u00e9volution humaine, apporte la premi\u00e8re preuve  arch\u00e9ologique de l&rsquo;existence des capacit\u00e9s cognitives et motrices  n\u00e9cessaires \u00e0 la fabrication d&rsquo;outils en pierre dure chez des hominid\u00e9s,  il y a d\u00e9j\u00e0 plus de 3 millions d&rsquo;ann\u00e9es.<\/span><\/strong><\/p><\/blockquote>\n<p><span style=\"color: #000080;\"> Les conditions de l&rsquo;\u00e9mergence  de ces outils sont \u00e0 \u00e9lucider : les investigations se poursuivent donc  sur ce site de la rive occidentale du Turkana, qui n&rsquo;a pas encore livr\u00e9  tous ses secrets.<\/p>\n<p><\/span><\/p>\n<div style=\"width: 358px;\"><span style=\"color: #000080;\"><img loading=\"lazy\" decoding=\"async\" style=\"border:0px none;\" src=\"http:\/\/www2.cnrs.fr\/sites\/communique\/image\/tool_in_situ_being_unearthed_at_excavation_1_artifica.jpg\" alt=\"CP Harmand 1\" width=\"358\" height=\"239\" \/><\/span><\/p>\n<hr \/>\n<p><span style=\"color: #000080;\"><br \/>\n<\/span><\/p>\n<p><span style=\"color: #000080;\"><img loading=\"lazy\" decoding=\"async\" style=\"border:0px none;\" src=\"http:\/\/www2.cnrs.fr\/sites\/communique\/image\/tool_in_situ_being_unearthed_at_excavation_2_artifica.jpg\" alt=\"CP Harmand 2\" width=\"358\" height=\"239\" \/><\/span><\/p>\n<hr \/>\n<\/div>\n<p><span style=\"color: #000080;\"><img loading=\"lazy\" decoding=\"async\" style=\"border:0px none;\" src=\"http:\/\/www2.cnrs.fr\/sites\/communique\/image\/tool_in_situ_being_unearthed_at_excavation_3_artifica.jpg\" alt=\"CP Harmand 3\" width=\"358\" height=\"239\" \/><\/span><\/div>\n<div><span style=\"color: #000080;\"><br \/>\n<\/span><\/div>\n<div><span style=\"color: #000080;\"> \u00a9 MPK-WTAP Outil mis au jour lors de la fouille<\/span><\/div>\n<div>\n<hr \/>\n<\/div>\n<div id=\"textContenu\">\n<div style=\"width: 358px;\">\n<hr \/>\n<\/div>\n<p><span style=\"color: #000080;\"><\/p>\n<p><\/span><\/p>\n<div style=\"width: 358px;\"><span style=\"color: #000080;\"><img loading=\"lazy\" decoding=\"async\" style=\"border:0px none;\" src=\"http:\/\/www2.cnrs.fr\/sites\/communique\/image\/general_view_lomekwi_area_1_artifica.jpg\" alt=\"CP Harmand 4\" width=\"358\" height=\"239\" \/><\/span><\/p>\n<hr \/>\n<p><span style=\"color: #000080;\">\u00a9 MPK-WTAP<\/span><\/p>\n<p><span style=\"color: #000080;\">Vue g\u00e9n\u00e9rale des environs du site de Lomekwi, rive occidentale du lac Turkana<\/span><\/p>\n<hr \/>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>La d\u00e9couverte des plus vieux outils de pierre taill\u00e9e au monde s&rsquo;est faite au K\u00e9nya. Des outils de pierre taill\u00e9e, vieux de 3,3 millions d&rsquo;ann\u00e9es.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63],"tags":[2150,3184,3294,5669],"class_list":["post-55726","post","type-post","status-publish","format-standard","hentry","category-questionsdactualite","tag-ethiopie","tag-kenya","tag-lac-turkana","tag-vieux-outils-de-pierre-taillee"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les plus vieux outils du monde ont 3,3 millions d&#039;ann\u00e9es -<\/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:\/\/www.sillon38.com\/blog\/2015\/06\/05\/les-plus-vieux-outils-du-monde-ont-33-millions-dannees\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les plus vieux outils du monde ont 3,3 millions d&#039;ann\u00e9es -\" \/>\n<meta property=\"og:description\" content=\"La d\u00e9couverte des plus vieux outils de pierre taill\u00e9e au monde s&#039;est faite au K\u00e9nya. Des outils de pierre taill\u00e9e, vieux de 3,3 millions d&#039;ann\u00e9es.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sillon38.com\/blog\/2015\/06\/05\/les-plus-vieux-outils-du-monde-ont-33-millions-dannees\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-06-05T05:27:13+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www2.cnrs.fr\/sites\/communique\/image\/tool_in_situ_being_unearthed_at_excavation_1_artifica.jpg\" \/>\n<meta name=\"author\" content=\"Gilbert\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gilbert\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" 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