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Volume 44 (2005)
- Issue 6 Pages 323-
- Issue 5 Pages 275-
- Issue 4 Pages 193-
- Issue 3 Pages 131-
- Issue 2 Pages 79-
- Issue 1 Pages 1-
Volume 44, Issue 3
Displaying 1-5 of 5 articles from this issue
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Takuichiro Kuwabara2005 Volume 44 Issue 3 Pages 131-144
Published: June 01, 2005
Released on J-STAGE: August 21, 2009
JOURNAL FREE ACCESSUnder the relative sea-level change during the Pleistocene epoch, marine-terrace deposits were thickly accumulated in the Tanabu Plain, which belongs to the tectonic depression running along the volcanic front in the Northeast Japan arc. The marine succession of the middle and late Pleistocene epoch in this plain includes at least four depositional sequences, named the Gamanosawa, Toei, Kabayama, and Tonamigaoka Formations from lower (older) to upper (younger). The sequences form the marine terraces named the Gamanosawa, Toei, Kabayama, and Tonamigaoka surfaces, respectively, from higher (older) to lower (younger). Each of the sequences has two depositional units. Each lower unit in the sequences is a thick mud, sand, and gravel layer which fills valleys with the sedimentary facies, indicating an estuary paleoenvironment. Each upper unit in the sequences is a sand and gravel layer which thinly overlies a wave-cut platform with the sedimentary facies, indicating a strand plain paleoenvironment. The depositional environment of each of these sequences shows that relative sea-level changed from transgression to regression at that time. The transgression deduced from the youngest sequence, namely the Tonamigaoka formation, tephrochronologically represents the high stand of the marine isotope stage 5e. Therefore the transgressions deduced from the three older sequences-Gamanosawa, Toei, and Kabayama-represent high stands earlier than the marine isotope stage 5e, probably the high stands of the middle Pleistocene epoch.View full abstractDownload PDF (3383K) -
Geomorphological Effect on the Flattening Rate of TibiaeYuka Iwamoto2005 Volume 44 Issue 3 Pages 145-153
Published: June 01, 2005
Released on J-STAGE: August 21, 2009
JOURNAL FREE ACCESSThe morphology of cranial bones and teeth is caused mainly by hereditary factors. Limb bones, on the contrary, less commonly show the direct result of evolutional changes, but they are affected by environmental factors. This paper focuses on the relationship between the flattening rate of tibiae and the palaeoenvironment of yielded sites, with particular reference to the relative relief. All discussed sites belong to the Earliest to Early Jomon periods (ca. 10, 000-4, 800yrs BP.). The subsistence of these periods mainly depended on hunting and gathering, and it is estimated that the location of sites affected the life styles of human groups.
The flattening rate is shown as transverse diameter at the mid-shaft/sagittal diameter at the mid-shaft×100. In order to clarify the topographical features around a given site, availability of the relative relief is discussed. The relative relief indicates the difference between the maximum land height and the minimum one. The mean relative relief within about 10km×10km is calculated for each site area. Flatted tibiae tend to be found from the sites on hills and in mountainous locations. The people who had the flattest tibiae seems to have lived on hills and shell mound areas. Less flat tibiae samples tend to be derived from the sites on the upland areas. It is distinct that the relative relief of uplands is smaller than those of hill and mountain areas.
The comparison between flatness of tibiae and the site locations is, therefore, possible to make with some positive phenomenal correlations. The relative relief, in particular, indicates as a distinctive attribute for the purpose of distinguishing the site locations.View full abstractDownload PDF (1326K) -
Ryuta Hataya, Makoto Yanagida, Masaru Sato, Toshinori Sasaki2005 Volume 44 Issue 3 Pages 155-167
Published: June 01, 2005
Released on J-STAGE: August 21, 2009
JOURNAL FREE ACCESSAccumulating data on the stratigraphy of fluvial terraces is very important for estimating uplift during late Quaternary. For this purpose, we reconsidered terrace stratigraphy in Kawasaki basin, Miyagi prefecture, by airphoto interpretation, field survey, and tephra chronology. The Kawauchi terrace, which was correlated to stage 3 in previous research, is a fill-top terrace, and we obtained Aso-4 tephra in the deposit overlying this terrace. We concluded that this terrace surface was probably formed in stage 6 on the basis of these data and of topographic features obtained by the airphoto interpretation. We suggest the following: (1) the Adachi-Medeshima Pumice (Ac-Md) was deposited earlier than in stage 6, because the Kawauchi terrace is not covered by Ac-Md. It has been estimated to have been deposited 90-100ka. (2) The formation ages of terraces that are covered by the Adachi-Medeshima Pumice are older than the previous estimation. (3) The uplift in/around the survey area during the last 100, 000 years, which was estimated by fluvial terrace stratigraphy in previous reports, is overestimated.View full abstractDownload PDF (1787K) -
T. Azuma, Y. Ota, M. Ishikawa, K. Taniguchi2005 Volume 44 Issue 3 Pages 169-176
Published: June 01, 2005
Released on J-STAGE: August 21, 2009
JOURNAL FREE ACCESS -
Akihisa Kitamura, Akio Omura, Eiji Tominaga, Koji Kameo, Masakazu Nara2005 Volume 44 Issue 3 Pages 177-182
Published: June 01, 2005
Released on J-STAGE: August 21, 2009
JOURNAL FREE ACCESSThe middle Pleistocene Kunosan Formation is distributed in the Udo Hills (Shizuoka, central Japan) that was tectonically uplifted about 300m during the late Quaternary. The formation consists of about 200-m-thick of coarse-grained fan-delta deposits. The thorium-230 age of a species of solitary coral from the Kunosan Formation in the eastern Udo Hills (Muramatsu Gravel-Silt Member) is 176.5+3.7-3.6ka (error is 1σ). This radiometric age means that the Kunosan Formation was deposited during marine isotope stage 6.5. This interpretation is consistent with previously published chronologic information for the middle and upper Pleistocene in the Udo Hills.View full abstractDownload PDF (833K)
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