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A Study on Footprints of Pliocene-Pleistocene Land Mammals.

上新世-更新世陆地哺乳动物足迹的研究。

基本信息

批准号：
01480033
负责人：
KAMEI Tadao
金额：
$ 3.58万
依托单位：
SHISHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01480033/
关键词：
Pliocene Mammals Footprint

项目摘要

Investigations of stratigraphy, geochronology and paleoenvironment have been carried out respectively for mammalian footprint localities such as the sites of River Yasu of Shiga, Hanamaki of Iwate, Koshiji-machi of Niigata and sea coast of Akashi City, Hyogo. In addition, pattern analysis has been a ttempted in the study to those fose fossil footprints. In the course of study, distinct fossil footprints have been newly found in Ishikawa river bed at Tondabayashi City of Osaka, lake bottom of Lake Nojiri of Nagano and other localities in Japan and Indonesia.(1) The stratigraphic horizons of those footprint sites are mostly concen-trated in the Lower Pleistocene beds, except for a case of Lake Nojiri. Even outside Japan, the presence of Pliocene-Pleistocene footprint are attractive worldwide likewise Laetoli of East Africa and West Texas sites of U. S. A.(2) Sedimentologically all of those footprints are characteristic of embedding in thin alternation silt-sand with intercalations of coarse sand which were deposited under dry-wet condition. Therefore, the formation of footprint could be connected with a circumstance of peculiar age and space.(3) It becomes to be possible partly to identify host animals specifically from the pattern recognition of fossil footprints. For example, foot-print patterns of Nauman's Elephant Paleoloxodon naumanni of Late Pleisto-cene is able to be discriminated from that of Early Pleistocene elephant Stegod onaurorae.

对滋贺的安苏河、岩手的花卷、新泻的越地町和兵库县明石市的海岸等哺乳动物足迹地点分别进行了地层学、年代学和古环境的调查。此外，还尝试了对化石足迹进行模式分析的方法。在研究过程中，在日本大坂富田林市的石川河床、日本长野野尻湖湖底以及印度尼西亚等地新发现了明显的化石足迹。(1)除野尻湖外，这些足迹地点的地层层位大多集中在下更新统地层中。即使在日本以外，上新世-更新世足迹的存在在世界范围内也很有吸引力，东非的莱托利和美国德克萨斯州西部的遗址也是如此。S. A. (2)在沉积学上，这些足迹都具有埋藏在干湿交替条件下沉积的粗砂夹薄层粉砂中的特征。因此，脚印的形成可能与特定的时空环境有关。(3)从化石足迹的模式识别中可以部分地识别宿主动物。例如，晚更新世的Nauman象Paleoloxodon naumanni的足迹模式能够与早更新世的Stegod onaurorae的足迹模式区分开来。