{"id":18152,"date":"2026-01-31T11:21:00","date_gmt":"2026-01-31T09:21:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=18152"},"modified":"2026-02-05T15:03:54","modified_gmt":"2026-02-05T13:03:54","slug":"science-au-maroc-des-fossiles-eclairent-une-periode-cle-de-notre-evolution","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/01\/31\/science-au-maroc-des-fossiles-eclairent-une-periode-cle-de-notre-evolution\/","title":{"rendered":"[Science] Au Maroc, des fossiles \u00e9clairent une p\u00e9riode cl\u00e9 de notre \u00e9volution"},"content":{"rendered":"<div class=\"paragraph\">\n<p>Mais quel \u00e2ge ont-ils\u00a0? Le doute a longtemps subsist\u00e9. \u00ab\u00a0<i>Nous avons essay\u00e9 plusieurs m\u00e9thodes qui donnaient des r\u00e9sultats contradictoires<\/i>\u00a0\u00bb, raconte le chercheur. Jusqu\u2019\u00e0 la parution d\u2019un article qu\u2019il a cosign\u00e9 d\u00e9but janvier dans la revue <i>Nature<\/i>. \u00ab\u00a0<i>Cette fois le doute n\u2019est plus permis<\/i>\u00a0\u00bb, assure-t-il. Ils ont 773 000 ans.<\/p>\n<p>Anc\u00eatre de \u00ab\u00a0Sapiens\u00a0\u00bb<\/p>\n<p>Pour parvenir \u00e0 cette conclusion, l\u2019\u00e9quipe a fait appel \u00e0 des g\u00e9ophysiciens de l\u2019Universit\u00e9 de Milan (Italie), experts en pal\u00e9omagn\u00e9tisme. C\u2019est-\u00e0-dire l\u2019histoire de l\u2019orientation du champ magn\u00e9tique terrestre qui change parfois d\u2019orientation et laisse des traces dans les s\u00e9diments. \u00ab<i>\u00a0<\/i><i>Il faut des conditions particuli\u00e8res pour pouvoir utiliser cette m\u00e9thode<\/i><i>\u00a0<\/i>\u00bb, pr\u00e9cise David Lef\u00e8vre. Notamment d\u2019\u00e9paisses couches de s\u00e9diments qui couvrent de longues p\u00e9riodes pendant lesquelles ont eu lieu des inversions de polarit\u00e9. \u00ab\u00a0<i>Ces conditions \u00e9taient r\u00e9unies sur le site<\/i>, ajoute le chercheur. <i>Et la chance que nous avons eue est que les fossiles se situaient pile dans une couche qui a enregistr\u00e9 une inversion de polarit\u00e9 bien connue et bien dat\u00e9e.<\/i><i>\u00a0<\/i>\u00bb L\u2019inversion de \u00ab\u00a0Matuyama-Brunhes\u00a0\u00bb qui s\u2019est produite il y a environ 773\u00a0000\u00a0ans.<\/p>\n<p>Et cet \u00e2ge est particuli\u00e8rement int\u00e9ressant. \u00ab\u00a0<i>Nous avons tr\u00e8s peu de fossiles entre 500<\/i><i>\u00a0<\/i><i>000 ans et 1<\/i><i>\u00a0<\/i><i>million d\u2019ann\u00e9es en Afrique. Or c\u2019est dans cet intervalle que les pal\u00e9og\u00e9n\u00e9ticiens estiment que la divergence entre la lign\u00e9e africaine d\u2019<\/i>Homo sapiens<i> et les lign\u00e9s eurasiatiques de N\u00e9andertal et de Denisova aurait pu avoir lieu<\/i><i>\u00a0<\/i>\u00bb, indique David Lef\u00e8vre. Autrement dit, ces fossiles repr\u00e9sentent une forme \u00e9volu\u00e9e d\u2019<i>Homo erectus<\/i> anc\u00eatre de la lign\u00e9e qui a conduit \u00e0 <i>Homo sapiens<\/i>. \u00ab\u00a0<i>Ces r\u00e9sultats confortent l\u2019hypoth\u00e8se de l\u2019origine africaine d\u2019<\/i>Homo sapiens\u00a0\u00bb, conclut le chercheur. Et ajoutent une pi\u00e8ce au puzzle de l\u2019\u00e9volution humaine que les pal\u00e9oanthropologues cherchent \u00e0 compl\u00e9ter pour retracer l\u2019histoire jusqu\u2019au plus ancien repr\u00e9sentant connu d\u2019<i>Homo sapiens<\/i>, vieux de 315\u00a0000\u00a0ans et d\u00e9couvert, lui aussi, au Maroc.<\/p>\n<p><b><span class=\"mln_small-caps_mln\">Xavier Boivinet<\/span><\/b><\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"Mais quel &acirc;ge ont-ils&nbsp;? Le doute a longtemps subsist&eacute;. &laquo;&nbsp;Nous avons essay&eacute; plusieurs m&eacute;thodes qui donnaient des r&eacute;sultats contradictoires&nbsp;&raquo;, raconte le chercheur. Jusqu&rsquo;&agrave; la &#8230;","protected":false},"author":1,"featured_media":18153,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3926,3925,20],"tags":[1793,1058,988,2001],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-18152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil-merge","category-accueil-third","category-societe","tag-archeologie","tag-science","tag-week-end","tag-weekend","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/18152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=18152"}],"version-history":[{"count":1,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/18152\/revisions"}],"predecessor-version":[{"id":18154,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/18152\/revisions\/18154"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/18153"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=18152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=18152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=18152"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=18152"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=18152"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=18152"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=18152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}