著者

亀井 節夫 ウルム氷期以降の生物地理総研グループ

出版者

日本第四紀学会

雑誌

第四紀研究 (ISSN:04182642)

巻号頁・発行日

vol.20, no.3, pp.191-205, 1981-10-31 (Released:2009-08-21)

参考文献数

61

被引用文献数

18 24 27

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This article deals with introducing some problems being debated by the members of the Research Group, relating to the fauna and flora of the Japanese Islands in the Last Glacial time. Though nowhere in Japan the precise chronostratigraphy of this age has been established yet, a tentative clasification based on litho- and biostratigraphy in central Japan by J. SAKAI and others is proposed with tephrochronology and radiometric dating. According to them, the Early stage began with the regression and advent of cold phase of ca. 65, 000yr.B.P., and further with the Middle stage chracterized by climatic ossilation, some peculiar warm phases were corporated. In the Late stage between 25, 000yr.B.P. and 10, 000yr.B.P. was intercalated the maximal cold phase of ca. 20, 000yr. B.P..Concerning the reconstruction of paleoenvironment, I. HIURA made biogeographical and ecological consideration by paying his attention to the species and subspecies distribution of non-dispersal plants and insects like as tribe ASAREAE and tribe CARABINI respectively. On the other hand, the vegetation of the Japanese Islands and its adjacent areas was investigated from the recent and Last Glacial plant geography by M. HOTTA and T. NASU respectively. They suggest significance of the distribution of plant communities to the seasonal structure of precipitation rather than to the temperature control. Summing up those results collectively, the environmental and vegetational studies on the Last Glacial seem to indicate the presence of more arid and extensive steppe-like environment which is absent in the present Japanese Islands.It is characteristic that some of the arctic mammals migrated into Honshu through northern land connection during the Last Glacial. Therefore, the mammalian fauna in that time was composed of arctic immigrants and temperate endemics, that is the mixed fauna. In this sence, that mixed fauna may resemble to the present of mammals in the Maritime Province (Siberia) and Manchuria of the continent. The immigration of those arctic mammals might be undertaken before the maximal phase of ca. 20, 000yr.B.P. In connection with this, the sea level change of those days was discussed. It may probable to say that the lowest sea level was -100m± as being discussed by M. HOSHINO and that the southern land connection did not happen at that time.

著者

亀井 節夫 池田 次郎 石田 志朗 茂原 信生 樽野 博幸 徳岡 隆夫 横山 卓雄

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1973, 1973

著者

亀井 節夫

出版者

Japan Association for Quaternary Research

雑誌

第四紀研究 (ISSN:04182642)

巻号頁・発行日

vol.29, no.3, pp.163-172, 1990-08-20 (Released:2009-08-21)

参考文献数

36

被引用文献数

5 5

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This is a summary of the presidential address to the public at the 19th annual meeting of the Japanese Association for Quaternary Research, held at Tottori August 18-20, 1989. The address had two parts: one was an introduction to the concept of “Quaternary” and the significance of Quaternary research, and the other was an elucidation of the discussion at the symposium on “Paleogeography and Paleoenvironments around the coastal areas of the Japan Sea”, exemplified by elephant fossils from the sea-bottom of the southern Japan Sea. The pioneers of Quaternary research in Japan, the German geologists E. NAUMANN and D. BRAUNS, were very interested in the elephant fossils of Japan and published papers on them in 1881 and 1883, respectively. Since that time, the study of elephant fossils and Quaternary research in Japan have been closely related.Since about 20 years ago, several elephant tusks and molars have been dredged by dragnet fisheries off the San'in district and also off the Noto peninsula in the southern Japan Sea. They were obtained from depths of 120m to 400m, on either the continental shelf or on the drowned bank of the sea-bottom. Formerly, those materials were considered to verify the presence of a landbridge in the past around the area of the Tsushima strait between Korea and Kyushu, but now this idea has come to be rejected. The results of analysis for the boring cores drilled at several places on the bottom of Japan Sea afford much information about paleoenvironmental changes during the Late Pleistocene. For example, an inflow of the Tsushima warm current to the Japan Sea, which is one of the remarkable tributaries of the Kuroshio, was reduced or arrested at that time by mixing with fresh water from the Hwang Ho River running through North China. This created a stagnant condition in the bottom water of the Japan Sea, and much influenced the biotic community there. Again, the inflow of the Tsushima warm current to the Japan Sea was regenerated beginning about 6, 500 y. B. P.The elephant fossils on the sea-bottom consist of tusks and molars of Naumann's elephant Palaeoloxodon naumanni and a molar tooth of woolly mammoth Mammuthus primigenius. The radiocarbon dating carried out for these and others found on land showed that the former was older than 30, 000 y. B. P. and the latter was younger, around 20, 000 y. B. P. It is known that during the maximal cold phase in the Last Glacial, woolly mammoths came down from Siberia southward to Hokkaido, but did not cross over the Tsugaru strait to Honshu. Therefore, it is reasonable to assume that the remains of woolly mammoths would be transported by drifting from the Hwang Ho area to that off San'in and then sink to the bottom of the Japan Sea. However, the idea is still a matter of imagination, more investigation for the environmental changes during the Quaternary in Japan needs to be done.

著者

亀井 節夫 杉沢 栄次郎 小林 武彦 岡本 正 菅原 聖 藤田 敬 高田 富造

出版者

地学団体研究会

雑誌

地球科学 (ISSN:03666611)

巻号頁・発行日

vol.1962, no.58, pp.32-34, 1962-01-25 (Released:2017-07-24)

著者

亀井節夫 [ほか] 編

出版者

築地書館

巻号頁・発行日

1981

著者

亀井節夫編著

出版者

築地書館

巻号頁・発行日

1991

著者

河村 善也 亀井 節夫 樽野 博幸

出版者

日本第四紀学会

雑誌

第四紀研究 (ISSN:04182642)

巻号頁・発行日

vol.28, no.4, pp.317-326, 1989 (Released:2009-08-21)

参考文献数

48

被引用文献数

24 41

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The Middle and Late Pleistocene mammalian faunas of Japan are described with new opinions on their succession and relation to the continental faunas. Although fossil materials assignable to early Middle Pleistocene are seemingly scarce in Japan, the fauna of that time is considered to have been transitional between the Early and Middle Pleistocene ones. On the other hand, fossil records which are younger than early Middle Pleistocene are abundant from the mainlands of Japan; viz. the Honshu-Shikoku-Kyushu area.In the middle Middle Pleistocene, the fauna of this area contained a considerable number of taxa which are extant today in the area (about 50%). It was also characterized by a high proportion of endemic species and the predominance of temperate forest elements. From this time to the late Middle Pleistocene, several species disappeared from the fauna; at the same time, immigrants from the continent were scarce. The faunal characters of the late Middle Pleistocene were basically identical with those of the preceding time.In the early Late Pleistocene, no mammal seems to have immigrated from the neighboring continent, and faunal composition was almost consistent with that of the late Middle Pleistocene. The elements of that fauna still persisted in the late Late Pleistocene, apart from the extinction of a few forms. In addition to the fact mentioned above, immigration from the northern part of the continent was recognized in the late Late Pleistocene, although it was restricted to a few large herbivore forms and to a short time duration.The introduction of the continental faunas to the mainlands of Japan during Middle and Late Pleistocene times was not so remarkable as previously inferred. Therefore it becomes doubtful that the faunas of the area were drastically replaced by the immigration of the Choukoutien, Wanhsien and Loess faunas of China during those times.

著者

小畠 信夫 千地 万造 池辺 展生 石田 志朗 亀井 節夫 中世古 幸次郎 松本 英二

出版者

日本第四紀学会

雑誌

第四紀研究 (ISSN:04182642)

巻号頁・発行日

vol.4, no.2, pp.49-58_2, 1965-09-30 (Released:2009-08-21)

参考文献数

12

被引用文献数

4 12

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In the circumference of the Ôsaka region, there are widely distributed Plio-Pleistocene deposits, the Ôsaka group. In September of 1964, nearly complete, but without some limbs and tail bones, skeletons of a fossil crocodile were excavated from the upper part of the Ôsaka group, at the ground of the Ôsaka University, Machikaneyama, Shibahara, Toyonaka City, Ôsaka Pref.. The horizon was the fresh water sandy clay bed which lay between the 8th marine clay above and the 7th marine clay below, of that group. Thus, the geological age of this horizon is estimated to be the Early Pleistocene. It was the first discovery of the crocodile fossil in Japan, and then, this long snout crocodile was named as Tomistoma machikanense Kamei et Matsumoto (n. sp.).