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Volume 44 (1990)
- Issue 6 Pages 295-
- Issue 5 Pages 231-
- Issue 4 Pages 167-
- Issue 3 Pages 95-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 44, Issue 4
Displaying 1-7 of 7 articles from this issue
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Masatoshi GotoArticle type: Article
1990 Volume 44 Issue 4 Pages i-ii
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (1018K) -
Kamo Collaborative Research GroupArticle type: Article
1990 Volume 44 Issue 4 Pages 167-183
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSThe Pliocene and Pleistocene Series of the Kamo area, located in the eastern marginal hills of the Niigata Plain, are divided into four formations: the Ohminagawa, Myogadani, Akatani and Shimizusawa Formations in ascending order. They are overlain by terrace deposits of two levels. The Ohminagawa Formation is 150 meters thick and is composed mainly of marine sandy siltstone containing planktonic formainifera fossils. The Myogadani Formation is 140 meters thick and composed of marine sand containing moluscus with corresponds to the Omma-Manganji Fauna. The fission track ages of the volcanic ash layers in this formation indicate 1.6 Ma. and 0.9 Ma. The Akatani Formation is 90 meters thick and unconformably covers the underlying formations. This formation is composed of alternating beds of silt, sand and gravel containing fossils of floras and diatom, which indicates a change in sedimentary environments of marine through brackish to fresh water. The Shimizusawa Formation is 13 meters thick and unconformably covers the Akatani Formation. The formation consists of terrestrial deposits of sand, gravel and silt layers. The Ohminagawa, Myogadani and Akatani Formations are correlative with the Lowermost and Lower, Middle and Upper Formations of the Pliocene-Early Pleistocene Uonuma Group in the Niigata region, respectively. The Shimizusawa Formation corresponds to Middle Pleistocene.View full abstractDownload PDF (2055K) -
Part 2: The Suzuka Granite plutonCollaborative Research Group for the Granites around Lake BiwaArticle type: Article
1990 Volume 44 Issue 4 Pages 184-195
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSThe Suzuka Granite pulton occupies the backborn area of the Suzuka Mountains, southwest Japan. It has an extent of 3〜9km (E-W)×13km (E-S), convex by arched southeastward, being intruded into the late-Paleozoic to Mesozoic formations of the Mino belt. The northern half of the pulton consists of biotite granites of following three major rock-types, the Yunoyama-type, Happudani-type and Kanzaki-type, and subordinate Hatomine-type. Two intrusive stages are recognized for them. The Suzuka Granite is associated with the porphyries, which are related to the late-Cretaceous felsic volcanism (Koto Rhyolites) forming a cauldron. The Suzuka Granite is considered to an outer most part of the ring complex in the south of Lake Biwa.View full abstractDownload PDF (2167K) -
Hideo Nakaya, Mitsushi FujimotoArticle type: Article
1990 Volume 44 Issue 4 Pages 196-204
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSThe purpose of this paper is to analyze the morphology and ontogenetic changes of animals using a microcomputer. For this purpose, three-dimensional measurements were carried out on the horns of nine bovid forms (Mammalia, Artiodactyla). On the basis of this data, their forms are reconstructed by computer graphics, and their growth is analyzed. The results of the analyses indicate that the morphology of the horns is decided by the increased mass of the radius, the rotation angle of torsion around the growth axis, the inclination of the growth axis, and the variation of the X, Y, Z coordinates which represent the growth direction.View full abstractDownload PDF (847K) -
Masahiro Shiba, Masatoshi Okubo, Shigeru Kasahara, Genju Yamamoto, Shi ...Article type: Article
1990 Volume 44 Issue 4 Pages 205-223
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSThe Ihara Group is found on the Iwabuchi, the Habuna and the Hoshiyama Hills around the lower Fuji River. This area is considered to be northern extention of the the Suruga Trough. The Ihara Group, whose age is assigned to be the Early to Middle Pleistocene, is divided into the Kanbara and the Iwabuchi Formations in ascending order. The Kanbara Formation is consisted of the Kanbara gravel and the Bessho gravel Members. The Iwabuchi Formation is subdivided into the Iwabuchi volcanic rock, the Minamimatsuno sand and gravel, the Senzui sand and gravel, Saginota gravel, the Koda gravel, the Mizunuma gravel and silt, the Kamihabuna sand and gravel and the Hoshiyama gravel Members. The Iwabuchi Hill is characterized by NNE-SSW-trending synclinal structure (the Umusegawa syncline). The northern part of the Habuna Hill is characterized by a series of ENE-WSW-trending fold. The Kanbara gravel Member was supplied with gravel through the Fuji River. On the other hand, the Bessho was supplied through the river from the Tanzawa Mountains or the area below Mt. Fuji. The Iwabuchi Formation is consisted of the Iwabuchi volcanic rock and the lagoonal sediments isolated from the outer sea by topographic high formed by the volcanic activity. The gravels of the Iwabuchi Formation were supplied through the Fuji River, however, the Kamihabuna sand and gravel Member in the northern part of the Habuna Hill was supplied through the Fuji River and also the river from the Tanzawa Mountains or the area below Mt. Fuji.View full abstractDownload PDF (3576K) -
Hitoshi Furusawa, Numata Fossil Research GroupArticle type: Article
1990 Volume 44 Issue 4 Pages 224-228
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
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14C age of the Quaternary deposits in Japan (173)Iwamizawa Research GroupArticle type: Article
1990 Volume 44 Issue 4 Pages 229-230
Published: July 25, 1990
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (267K)
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