{"id":6318,"date":"2026-05-03T07:50:59","date_gmt":"2026-05-03T06:50:59","guid":{"rendered":"https:\/\/lesminis.fr\/blog\/?p=6318"},"modified":"2026-05-03T10:19:34","modified_gmt":"2026-05-03T09:19:34","slug":"empreintes-laetoli-decouverte-histoire-humaine","status":"publish","type":"post","link":"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/","title":{"rendered":"Empreintes de Laetoli : la d\u00e9couverte qui a chang\u00e9 l&rsquo;histoire humaine"},"content":{"rendered":"<p>En Tanzanie, des chercheurs ont retrouv\u00e9 des empreintes de pas vieilles de 3,66 millions d&rsquo;ann\u00e9es. Pendant longtemps, on pensait qu&rsquo;elles racontaient l&rsquo;histoire d&rsquo;une seule esp\u00e8ce d&rsquo;hominine. En 2021, une nouvelle \u00e9tude a montr\u00e9 qu&rsquo;on s&rsquo;\u00e9tait tromp\u00e9s. Et que la lign\u00e9e humaine \u00e9tait bien plus complexe qu&rsquo;on ne le croyait. Voici ce qu&rsquo;il faut comprendre.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Que_sont_les_empreintes_de_Laetoli\" >Que sont les empreintes de Laetoli ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Hominine_ou_humain_quelle_difference\" >Hominine ou humain : quelle diff\u00e9rence ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Pourquoi_ces_empreintes_ont_fait_sensation_en_1978\" >Pourquoi ces empreintes ont fait sensation en 1978<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Lempreinte_mysterieuse_du_site_A\" >L&#8217;empreinte myst\u00e9rieuse du site A<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Letude_de_2021_qui_a_tout_change\" >L&rsquo;\u00e9tude de 2021 qui a tout chang\u00e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Ce_quil_faut_retenir\" >Ce qu&rsquo;il faut retenir<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/lesminis.fr\/blog\/empreintes-laetoli-decouverte-histoire-humaine\/#Sources_scientifiques\" >Sources scientifiques<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Que_sont_les_empreintes_de_Laetoli\"><\/span>Que sont les empreintes de Laetoli ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Les empreintes de Laetoli ont \u00e9t\u00e9 d\u00e9couvertes en 1978 par Paul Abell, qui faisait partie de l&rsquo;\u00e9quipe de la pal\u00e9oanthropologue britannique Mary Leakey. Le site se trouve dans le nord de la Tanzanie, \u00e0 une cinquantaine de kilom\u00e8tres au sud des gorges d&rsquo;Olduvai.<\/p>\n<p>Ce qui rend ces empreintes uniques, c&rsquo;est leur \u00e9tat de conservation. Un volcan voisin, le Sadiman, avait recouvert la plaine d&rsquo;une fine couche de cendre. Une pluie est tomb\u00e9e juste apr\u00e8s, transformant la cendre en boue molle. Des hominines ont march\u00e9 dessus. Le soleil a s\u00e9ch\u00e9 la trace. Une nouvelle \u00e9ruption a recouvert le tout. R\u00e9sultat\u00a0: les empreintes sont rest\u00e9es intactes pendant 3,66 millions d&rsquo;ann\u00e9es.<\/p>\n<p>Sur le site principal, deux individus ont march\u00e9 c\u00f4te \u00e0 c\u00f4te sur 27 m\u00e8tres. Un troisi\u00e8me, plus petit, a suivi en posant ses pieds dans les traces du premier.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hominine_ou_humain_quelle_difference\"><\/span>Hominine ou humain : quelle diff\u00e9rence ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Avant d&rsquo;aller plus loin, un point de vocabulaire qui compte. Quand on parle de Laetoli, on ne parle pas d&rsquo;humains au sens moderne du terme. Le mot \u00ab\u00a0humain\u00a0\u00bb d\u00e9signe en g\u00e9n\u00e9ral notre esp\u00e8ce, <em>Homo sapiens<\/em>, ou au moins le genre <em>Homo<\/em>.<\/p>\n<p>Le bon terme pour les esp\u00e8ces de Laetoli, c&rsquo;est <strong>hominine<\/strong>. Une hominine, c&rsquo;est un membre de la lign\u00e9e humaine au sens large, apr\u00e8s la s\u00e9paration d&rsquo;avec les chimpanz\u00e9s. \u00c7a inclut les australopith\u00e8ques, les paranthropes, et bien s\u00fbr les <em>Homo<\/em>. Lucy est une hominine, mais ce n&rsquo;est pas une humaine au sens strict.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pourquoi_ces_empreintes_ont_fait_sensation_en_1978\"><\/span>Pourquoi ces empreintes ont fait sensation en 1978<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Les empreintes ont \u00e9t\u00e9 imm\u00e9diatement attribu\u00e9es \u00e0 <em>Australopithecus afarensis<\/em>, l&rsquo;esp\u00e8ce de Lucy, dont les premiers fossiles avaient \u00e9t\u00e9 d\u00e9crits trois ans plus t\u00f4t en \u00c9thiopie.<\/p>\n<p>Lucy \u00e9tait d\u00e9j\u00e0 connue pour avoir march\u00e9 debout. Son bassin et son f\u00e9mur le montraient clairement. Mais le degr\u00e9 exact de sa bip\u00e9die restait d\u00e9battu. Certains chercheurs, comme Stern et Susman, pensaient qu&rsquo;elle gardait encore une part de vie dans les arbres, \u00e0 cause de ses doigts courb\u00e9s.<\/p>\n<p>Les empreintes de Laetoli ont tranch\u00e9. Elles montrent une marche pleinement debout\u00a0: le talon se pose en premier, le pied roule, puis le gros orteil pousse vers l&rsquo;avant. Exactement comme nous. Pas une d\u00e9marche h\u00e9sitante, pas un compromis arboricole. Une vraie marche d&rsquo;hominine moderne, presque deux millions d&rsquo;ann\u00e9es avant l&rsquo;apparition du genre <em>Homo<\/em>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Lempreinte_mysterieuse_du_site_A\"><\/span>L&#8217;empreinte myst\u00e9rieuse du site A<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Une empreinte isol\u00e9e, rep\u00e9r\u00e9e en 1976 sur un sous-site appel\u00e9 Laetoli A, posait probl\u00e8me. Elle mesurait 21 centim\u00e8tres, \u00e9tait large, et ne ressemblait \u00e0 rien de connu. Faute d&rsquo;explication, l&rsquo;anatomiste Russell Tuttle a propos\u00e9 qu&rsquo;elle puisse appartenir \u00e0 un ours marchant temporairement debout.<\/p>\n<p>Le probl\u00e8me, c&rsquo;est qu&rsquo;aucun fossile d&rsquo;ours n&rsquo;a jamais \u00e9t\u00e9 retrouv\u00e9 dans cette r\u00e9gion d&rsquo;Afrique \u00e0 cette \u00e9poque. L&rsquo;hypoth\u00e8se \u00e9tait bancale d\u00e8s le d\u00e9part. L&#8217;empreinte est donc rest\u00e9e une curiosit\u00e9, oubli\u00e9e pendant 40 ans dans les notes de bas de page.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Letude_de_2021_qui_a_tout_change\"><\/span>L&rsquo;\u00e9tude de 2021 qui a tout chang\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>En 2019, une \u00e9quipe est revenue sur le site, red\u00e9gage l&#8217;empreinte, la nettoie, et la scanne en 3D. En 2021, l&rsquo;analyse compl\u00e8te est publi\u00e9e dans la revue <em>Nature<\/em>, sous la direction d&rsquo;Ellison McNutt.<\/p>\n<p>Les chercheurs ont compar\u00e9 l&#8217;empreinte \u00e0 celles d&rsquo;ours noirs nord-am\u00e9ricains marchant debout, \u00e0 des chimpanz\u00e9s et \u00e0 des humains modernes. Le r\u00e9sultat est sans \u00e9quivoque\u00a0:<\/p>\n<ul>\n<li>La largeur du pas est trop \u00e9troite pour un ours, qui marche jambes \u00e9cart\u00e9es pour s&rsquo;\u00e9quilibrer.<\/li>\n<li>Le gros orteil est dominant, ce qui correspond aux hominines, pas aux ours (chez qui c&rsquo;est le cinqui\u00e8me doigt).<\/li>\n<li>Le talon imprime en premier, signature d&rsquo;une d\u00e9marche bip\u00e8de d&rsquo;hominine.<\/li>\n<\/ul>\n<p>Conclusion\u00a0: ce n&rsquo;est pas un ours. C&rsquo;est bien une hominine. Mais sa morphologie est diff\u00e9rente d&rsquo;<em>Australopithecus afarensis<\/em>. Hallux plus \u00e9cart\u00e9, d\u00e9marche en pas crois\u00e9s, proportions distinctes. Il s&rsquo;agit d&rsquo;une autre esp\u00e8ce, contemporaine de Lucy, et encore inconnue aujourd&rsquo;hui.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ce_quil_faut_retenir\"><\/span>Ce qu&rsquo;il faut retenir<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Il y a 3,66 millions d&rsquo;ann\u00e9es, au moins deux lign\u00e9es d&rsquo;hominines bip\u00e8des diff\u00e9rentes marchaient debout au m\u00eame endroit, en m\u00eame temps. Lucy n&rsquo;\u00e9tait pas seule. La lign\u00e9e humaine n&rsquo;a jamais \u00e9t\u00e9 une ligne droite, c&rsquo;est un buisson de cousins, dont la plupart ont disparu sans descendance. Et certains, comme l&rsquo;auteur de l&#8217;empreinte du site A, n&rsquo;ont m\u00eame pas encore re\u00e7u de nom scientifique.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Sources_scientifiques\"><\/span>Sources scientifiques<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Leakey &amp; Hay, <em>Nature<\/em>, 1979.<\/li>\n<li>McNutt <em>et al.<\/em>, <em>Nature<\/em>, 2021.<\/li>\n<li>Masao <em>et al.<\/em>, <em>eLife<\/em>, 2016.<\/li>\n<\/ul>\n<blockquote class=\"wp-embedded-content\" data-secret=\"x1dnsyB3ra\"><p><a href=\"https:\/\/lesminis.fr\/blog\/incroyables-records-ours-noir-amerique\/\">L\u2019ours noir d\u2019Am\u00e9rique : des records qui vont vous \u00e9tonner !<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u00ab\u00a0L\u2019ours noir d\u2019Am\u00e9rique : des records qui vont vous \u00e9tonner !\u00a0\u00bb &#8212; LesMinis Le Blog - Mat\u00e9riels \u00e9ducatifs - Figurines p\u00e9dagogiques\" src=\"https:\/\/lesminis.fr\/blog\/incroyables-records-ours-noir-amerique\/embed\/#?secret=fDC9V5Xq8p#?secret=x1dnsyB3ra\" data-secret=\"x1dnsyB3ra\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>En Tanzanie, des chercheurs ont retrouv\u00e9 des empreintes de pas vieilles de 3,66 millions d&rsquo;ann\u00e9es. Pendant longtemps, on pensait qu&rsquo;elles racontaient l&rsquo;histoire d&rsquo;une seule esp\u00e8ce d&rsquo;hominine. En 2021, une nouvelle \u00e9tude a montr\u00e9 qu&rsquo;on s&rsquo;\u00e9tait tromp\u00e9s. Et que la lign\u00e9e humaine \u00e9tait bien plus complexe qu&rsquo;on ne le croyait. Voici ce qu&rsquo;il faut comprendre. Que [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6320,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1600,1602],"tags":[551,2572,2576,2575,2577,2578,2570,2573,2574,2571,2579],"class_list":{"0":"post-6318","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-actualites-culture-et-curiosites","8":"category-dinosaures-prehistoire-megafaune-figurine","9":"tag-prehistoire","10":"tag-australopithecus-afarensis","11":"tag-bipedie","12":"tag-empreintes-fossiles","13":"tag-evolution-humaine","14":"tag-hominines","15":"tag-laetoli","16":"tag-lucy","17":"tag-mary-leakey","18":"tag-paleoanthropologie","19":"tag-tanzanie"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Empreintes de Laetoli : la d\u00e9couverte qui a chang\u00e9 l&#039;histoire<\/title>\n<meta name=\"description\" content=\"En Tanzanie, des empreintes de 3,66 millions d&#039;ann\u00e9es prouvent que deux esp\u00e8ces d&#039;hominines marchaient debout en m\u00eame temps que Lucy. 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