Fission-Track, K-Ar Age Determinations and Palaeomagnetic Measurements of Miocene Volcanic Rocks in the Western Area of Baragoi, Northern Kenya: Ages of Hominoids

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概要

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• Miocene rocks in the west of Baragoi, northern Kenya, consist of the Nachola, Aka Aiteputh, Namurungule and Kongia Formations in ascending order. Two kinds of hominoids, Kenyapithecus and a large hominoid (Samburu hominoid), were found from the Nachola and Namurungule Formations, respectively, in summer 1982. Two fission-track and six K-Ar ages were determined on the volcanic rocks to clarify the ages of the hominoid fossils. Paleomagnetic reconnaissance was also conducted for the sake of magnetostratigraphic correlation. The ages of the Nachola, Aka Aiteputh, Namurungule and Kongia Formations were around 11, 13, 7 and 6.4 Ma, respectively. The ages of Kenyapithecus and Samburu hominoid are considered to be the Middle Miocene and Late Miocene, respectively.

• 京都大学の論文

著者

• Masayuki Torii

  Faculty Of Science Kyoto University

• Takaaki Matsuda

  Department Of Geology Himeji Institute Of Technology

• Matsuda Takaaki

  Department Of Applied Physics Faculty Of Engineering Miyazaki University

• Takehiro KOYAGUCHI

  Faculty of Science, the University of Tokyo

• Takeshi MAKINOUCHI

  Faculty of Science and Technology, Meijo University

• Hiromi MITSUSHIO

  Faculty of Science, Kochi University

• Shiro ISHIDA

  Faculty of Science, Kyoto University

• Ishida Shiro

  Faculty Of Pharmaceutical Sciences Tokushima Bunri University

• Shiro Ishida

  Faculty Of Science Kyoto University

• Takeshi Makinouchi

  Faculty Of Science And Technology Meijo University

• Takehiro Koyaguchi

  Faculty Of Science University Of Tokyo

• Hiromi Mitsushio

  Faculty Of Science Kyoto University

• TORII Masayuki

  Faculty of Science, Kyoto University

• KOYAGUCHI Takehiro

  Faculty of Science, University of Tokyo

• MAKINOUCHI Takeshi

  Faculty of Science and Technology, Meijo University

• MITSUSHIO Hiromi

  Faculty of Science, Kochi University

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