ゲオロジカル・パレオントロジカル・エイジング・コンクリート ゲオロジカル・パレオントロジカル・エッジ・コンクリート
Shigehiro Katoh1, Yonas Beyene2,3, Tetsumaru Itaya4
1Division of Natural History, Hyogo Museum of Nature and Human Activities, Sanda 669-1546, Japan.
Nature
|February 12, 2016
まとめ
エチオピアの化石の新しい年代測定は アフリカの猿と人間の起源を 9~700万年前に示しています この発見はアフリカにおけるヒト・ゴリラ群の 現地での進化を裏付けています
科学分野:
- 古生物学
- 地質年代学
- 霊長類の進化
背景:
- アフリカの類人猿と人間の起源を理解するために 重要な時期です
- この時期の サハラ以南のアフリカの化石の証拠は稀です
- エチオピアのチョロラ群は およそ1050万年前のものと考えられ チョロラピテクス・アビシニックスの化石が 発見されました
研究 の 目的:
- コロラ・フォーメーションの堆積物と 関連する化石の正確な年代測定
- 人間とゴリラの分断の タイムラインを修正する
- ミオセンの後半のアフリカにおける哺乳類の進化と動物交流を調査する.
主な方法:
- 新しい野外観測
- 地球化学分析
- マグネストラティグラフィー
- 放射性同位体による年代測定
主要な成果:
- チョロラ・フォーメーションの堆積物は 約900万~700万年前のものです
- コロラピテクス・アビシニカスの化石は800万年前のものです
- サハラ以南の哺乳類の化石は 850万年前から700万年前まで遡ります
- 証拠は,哺乳類の先住民族のアフリカ進化と,ナカリピテクス・ナカヤマイとC.アビシニクスの間の潜在的祖先-子孫のリンクを示唆しています.
- 東アフリカとユーラシアの間の動物界は,約900万年前に強まった.
結論:
- アフリカの猿と人間の起源について 重要な証拠を提供しています
- この発見は,アフリカにおけるゴリラ・パン・ヒューマンの進化の仮説を裏付けている.
- 改訂された年代順は 人間と類人猿の 深い差異の推定値と一致しています
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