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Title Transcription
カザン デイリュウ ニ ウモレタ ナチョラピテクスグン : ケニア リフト ホクブ ニ オケル 1500マンネンマエ ノ アルメロ ノ ヒゲキ
Title Alternative (English)
Nasholapithecus buried under lahars 15 mllion years ago in the northern Kenya Rift:an event similar to the Armero Town tragedy in 1985,Colombia
File
language
jpn
Author
Sawada, Yoshihiro
Nakayama, Katsuhiro
Saneyoshi, Mototaka
Yamanaka, Atsushi
Kunimastu, Yutaka
Nakatsukasa, Masato
Nakano, Yoshihiko
Tsujikawa, Hiroshi
Shimizu, Daisuke
Takano, Satoshi
Ogihara, Naomichi
Pickford, Martin
Ishida, Hidemi
Description
The Miocene strata in the Nachola area,northern Kenya have yielded many hominoid fossils which are important for the study of hominid evolution.The Joint Japan-Kenya team has conducted palaeontological excavations at Nachola since 1982 and has collected abundant fossil fauna,especially of Nacholapithecus,a hominoid of the Kenyapithecus group.
Nacholapithecus fossils were found at 15 sites in a thin horizon in the lowest part(15 Ma)of the Middle Miocene Aka Aiteputh Formation,scattered over an outcrop area of 13 km×3 km.The fossiliferous strata are covered by thick basalt lava flows.Clastic sedimentary rocks at representative fossil sites BG-K and BG-I are volcaniclastic and have been subdivided into at least 10 units,totaling about 13 m maximum thickness.Most of the clastic sediments are characteristically poorly sorted and are matrix supported with pyroclastic matrix and pumice(less than 2 cm in diameter).
They were mainly derived from a lahar,except for some units formed by flood or pyroclastic flow.Pyroclastic materials include volcanic glass,anorthoclase and aegirine augite derived from phonolitic trachyte.The Nacholapithecus fossils are well preserved,and many of the skeletal parts are in connection,especially at the site BG-K.
The hominoids seem to have been buried alive,similar to the situation that occurred on November13th,1985,at Amlero town,Colombia.Excavated fossils comprise many individuals of various age groups(infants to aged adults of both sexes)which may allow us to launch a new field of study,“palaeo-primate sociology”,which will throw light on the population structure of Macholapithecus groups.
Journal Title
島根大学地球資源環境学研究報告
Volume
20
Start Page
13
End Page
23
ISSN
13439774
Published Date
2001-12-28
NCID
AA11455176
DOI(SelfDOI)
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
中山勝博助教授追悼特集
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