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Our samples are now pre-treated at the University of Canterbury. Il a conduit à la définition d'une nouvelle espèce, Sahelanthropus tchadensis, que certains paléoanthropologues considèrent comme l'une des premières espèces de la lignée humaine, probablement très proche de la divergence entre les Panines (comprenant les chimpanzés) et le genre Homo (comprenant l'Homme) par une équipe de quatre hommes (Ahounta Djimdoumalbaye, qui fut le premier à toucher le fossile, Fanoné Gongdibé, Mahamat Adoum et Alain Beauvilain qui dirigeait la mission) en service au Centre national d'appui à la recherche (CNAR, Ministère de l'enseignement supérieur de la République du Tchad).I collected the samples in the field in 20: Having collected the samples in the field and received funding to run them, I went up to the Scottish Universities Environmental Reserach Centre (SUERC) laboratories in East Kilbride to start the process!As 10-Beryllium and 26-Aluminium preferentially build up in quartz, the aim of the first week was to crush down the samples and extract as pure quartz as we could.Une série de date absolues a été obtenue par une équipe française pour les niveaux de sédiments qui étaient censés renfermer le fossile.Ces datations réalisées grâce à la méthode du béryllium 10 / béryllium 9 ont permis d'établir que l'âge de Toumaï serait compris entre 6,8 et 7,2 millions d'années.Any magnetically charged particles are attracted to this and taken down a separate track, into a separate container.

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Be production rate is carefully calibrated, for example by correcting for partial attenuation and complete shielding effects."Spectra" is embedded with links that will take you back to the appropriate parts of the above two sites. The classic colors red, orange, yellow, green, blue, and violet connect in a seemingly infinite number of shades, one blending smoothly into the next.Together they constitute the "visual spectrum" (or "optical spectrum") because it is the part of the full spectrum that is seen with the human eye.La revue Nature publie trois articles sur cette découverte, dont deux de l'équipe, dans son numéro de juillet 2012.Des méthodes de datations biogéochronologiques ont permis d'estimer l’âge de Toumaï à environ 7 millions d'années, en se fondant sur le degré d'évolution des mammifères présents à ses côtés, par comparaison avec d'autres faunes africaines similaires.




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