All issues
Volume 56 (2002)
- Issue 6 Pages 321-
- Issue 5 Pages 253-
- Issue 4 Pages 215-
- Issue 3 Pages 141-
- Issue 2 Pages 63-
- Issue 1 Pages 1-
Volume 56, Issue 3
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
-
Ulleung Island Geological Research GroupArticle type: Article
2002 Volume 56 Issue 3 Pages 141-143
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSDownload PDF (1691K) -
Toshiaki OSADA, Kazuo TERAI, Kazuyoshi SASE, Shizuo NAKAYA, Kwang-Nam ...Article type: Article
2002 Volume 56 Issue 3 Pages 145-151
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSThe writers discovered abundant fossils of polychaetes from the Lower Miocene Shirahama Formation of the Tanabe Group in the southwestern part of Kii Peninsula. Wakayama Prefecture, Southwest Japan. The formation mainly consists of alternation of sandstone and mudstone, sandstone and conglomerate. The fossils have been occured from the mudstone of the alternation in the S1 Member which is the basal part of the formation. Many trace fossils have been discovered from the same horizon. The mode of the occurence are classified into three types as follows: Type I shows the outersurface of the body, Type II buried with oblique posture and Type III shows specimen exposing the inner structure of the body. Morphological characters of these fossils are shown by cylindrical and string-like form and are ellipsoid to round in the section of the body. Many segments and parapodia on both sides of each segment are well developed in the body. From the many characters of these fossils described here, the writers identified to a kind of family of the order Phyllodocida, but the family and genus names are not known.View full abstractDownload PDF (1547K) -
Shigeo IMAI, Yo KITAGAWA, Kazue TAZAKIArticle type: Article
2002 Volume 56 Issue 3 Pages 153-163
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSPrecipitates grow rapidly from underground water in limestone terrain of Okinoerabu Island located southern Kyusyu, Japan. In this island, Ca-rich underground water are used as drinking water which cause and effect choking toilet bowl and water pipes by the precipitates. In this study the precipitates were collected from toilet bowl at China-cho and from the water pipe of pump well at Akamine. Filamentous cyanobacteria are observed on the surface of the precipitates in both cases. These precipitates consist mainly of calcite with heavy metals, such as Cu, Zn, Mn, Fe and Pb which are concentrated from water. The accumulation of P and N are also detected at heavy metal layers by using EPMA. The precipitates can explain that biochemical conditions are favorable for carbonate formation. In human daily life the precipitates adhered to equipments are displeased as a dirt. However in this environments, the results suggest that microorganism can accumulate heavy metals from drinking water.View full abstractDownload PDF (4692K) -
Seiko MIYAGI, Yoshiaki KANAIArticle type: Article
2002 Volume 56 Issue 3 Pages 165-177
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSThe Ashigara Group in the southern Fossa Magna region is divided into six formations; the Doyama, Dai, Seto, Tsuburano, Hatazawa and Shiozawa Formations, in ascending order, which are composed mainly of sedimentary rocks. All formations except the Hatazawa Formation intercalate basaltic to andesitic effusive rocks. The volcanism is considered to have been the most active at the time of deposition of the Tsuburano Formation relative to other ages. The Yamakita Group is deposited in a volcanic depression which was formed after the upheaval of the Ashigara Group. Dikes are divided into the older and the younger ones. The older dikes which is considered to have intruded before the deposotion of the Yamakita Group, consist of two-pyroxene basalt to andesite. The younger dikes which is considered to have intruded after the deposition of the Yamakita Group, consist of hornblende andesite. The Yaguradake quartz diorite complex intrudes into the Hatazawa Formation, relating to the volcanic activity which formed the volcanic depression. The effusive and the dike rocks of the Ashigara Group are identified as low-K2O series defined by Gill (1981), and the hypersthenic rock series defined by Kuno (1966). Most of both the effusive rocks and the older dike rocks are plotted in the "TH series" defined by Miyashiro (1974) because of an enrichment of plagioclase phenocrysts. A spatial zoning is generally recognized in K2O content of the post-Miocene volcanic rocks in the southern Fossa Magna region, Izu Peninsula and Izu islands. The K2O content increases from east to west parallel to a NNE-SSW trend with some exceptions. This zoning could be related to the north to south trending continuity of geological structure of the basement rocks which were formed after the "Green-Tuff Movement" in the southern Fossa Magna region.View full abstractDownload PDF (1970K) -
Shoji KOBAYASHIArticle type: Article
2002 Volume 56 Issue 3 Pages 179-190
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSA sirenian fossil from the Itahana Formation (late Middle Miocene to early Late Miocene) in Annaka, Gunma, is described as a Halitheriinae, based on the right scapula, sternum, ribs and vertebrae. The fossil is called "Shimoakima specimen" in this paper after the name of the locality. Size and shape of those materials of Shimoakima specimen are similar to those of the genus Metaxytherium and Halitherium schinzi. Particularly, the specimens resemble the genus Metaxytherium in having plump ribs from the first to the fourth. A trapezoid scapula, a rectangular sternum and compressed thorax of the specimen are similar to those of Metaxytherium crataegense, M. subapenninum, M. serresii and M. floridanum. However, the Shimoakima specimen is more derived than Halitherium schinzi in having a large scapula with the broad dorsal margin, strong coracoid process. The Shimoakima specimen is presumed to be one of the earliest Dugongidae in Japan, and very important for researching the migration of the halitheriine dugongid from Europe to Japan in the Miocene.View full abstractDownload PDF (1676K) -
Genjyu YAMAMOTO, Takuji SASAGASE, Satoshi KOSIMIZU, Toshiaki KITAGAKIArticle type: Article
2002 Volume 56 Issue 3 Pages 191-196
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSFuji Volcano is located north of Suruga Bay in central Japan. Fuji Volcano is divided into Ko-Fuji (Older Fuji) Volcano and Shin-Fuji (Younger Fuji) Volcano. Ko-Fuji Volcano mainly consists of basaltic mud flows and rare lava flows. We found Ko-Fuji lava flows in the southwestern foot of Mt. Fuji. These lava flows are found in the mud flows or fan deposits on Ko-Fuji mud flows. The name of the lava flows are Takinoue and Takido lava flows. Their petrological characters are the same with those of Ko-Fuji volcanic rocks.View full abstractDownload PDF (1171K) -
Kitamimakimura Akebonozou Excavation Research GroupArticle type: Article
2002 Volume 56 Issue 3 Pages 197-202
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSTwo skeletons of Stegodon auroras were excavated in close disposition from the mud flow sediments of the Ookui Formation (Early Pleistocene). FT age of zircon in the Hakeyama pumice bed just above the fossil bed is measured as 1.3±0.3Ma. Although the skeletal arrangements were disassembled much, it was possible to identify two individuals, No. 1 and No. 2. It was unique that those two bodies' skeletons ware unearthed very closely, only 40 metres apart in the same horizon. Morphological traits of molars, mandible and body skeletons are all identical with those of S. aurorae known before. The postcranial skeletons are relatively short and stocky. The molars of both are well preserved. However, it is remarkable that the number of ridges in the upper third molar is different on each, 11 and 13, which indicate the upper and lower extremities in S. aurorae. The lower third molar (individual No. 1) has worn facets on the anterior side of the talonid, and this indicates that the eruption style of the following molar is arranged more ventrally. This fact suggests a forward shortening of the mandible, according to Konishi and Takahashi (1999).View full abstractDownload PDF (1570K) -
Kenji KASHIWAGI, Hitoshi TANAKA, Daisuke SAKAMOTO, Tsutomu TAKAHASHI, ...Article type: Article
2002 Volume 56 Issue 3 Pages 203-208
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSRadiolarian fossils were firstly extracted from the Kawaguchi Formation of the Chichibu Composite Terrane in the Yatsushiro area, western Kyushu. The Kawaguchi Formation is composed mainly of brackish strata, which yield abundant brackish conditional molluscus fossils, and intercalates shallow marine strata, which yield marine conditional molluscus fossils. In the western Kyushu, the Kawaguchi formation conformably overlies the Late Jurassic strata, and is overlain by Barremian strata. The radiolarian fossils obtained from the Kawaguchi formation are Hemicryptocapsa capita, Pseudoaulophacus (?) florealis, Sethocapsa uterculus, Suna cf. hybum and so on. This fauna indicates early to middle Hauterivian in age. The age assinged to the Kawaguchi Formation on the basis of radiolarian biochronology match well with the published stratigraphic data.View full abstractDownload PDF (1350K) -
Kiyoyuki SHIGENO, Futoshi NANAYAMAArticle type: Article
2002 Volume 56 Issue 3 Pages 209-211
Published: May 25, 2002
Released on J-STAGE: July 14, 2017
JOURNAL OPEN ACCESSDownload PDF (1244K)
- |<
- <
- 1
- >
- >|