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Volume 1983 (1983)
- Issue 132 Pages 191-
- Issue 131 Pages 125-
- Issue 130 Pages 61-
- Issue 129 Pages 1-
Volume 1983, Issue 132
Displaying 1-4 of 4 articles from this issue
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MASAYUKI NODA1983 Volume 1983 Issue 132 Pages 191-219
Published: December 30, 1983
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSIn this paper, Inoceramus japonicus Nagao et Matsumoto, 1940 is discriminated into I. (Platyceramus) higoensis sp. nov., I. (Pl.) japonicus hokkaidoensis su bsp. nov., and I. (Pl.) japonicus japonicus, which approximately correspond to forma α, β and γ of the original description, respectively. And I. (Pl.) higoensis is subdivided into I. (Pl.) higoensis higoensis and I. (Pl.) higoensis su bsp. At first I mention the procedures of the specific and the su bspecific discrimination at population level. Some selected characters are biometrically and statistically examined by means of the Student's t-test, the rejection ellipse, 75 percent rule and analysis of the relative growth. Then I give the specific and subspecific definition of the above taxa, comparing them with already known species. Finally I discuss the phylogenetic relationships of the concerned species and subspecies.View full abstractDownload PDF (7798K) -
TATSURO MATSUMOTO, TOSHIYA MIYAUCHI1983 Volume 1983 Issue 132 Pages 220-229
Published: December 30, 1983
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSThis is Part III of a monograph of the Cretaceous Nautiloids from Hokkaido being published in series. It contains the descriptions of the three species from the Campanian strata exposed on the northwestern coast of Cape Soya (Textfig.1). The first is a new species of Eutrephoceras, which is allied to E. kobayashi Matsumoto and E. pseudobouchardianum (Spengler) but its siphuncle is central instead of subventral or subdorsal. Its whorl is broader and more inflated than E. tawaense Furuichi or E. balchistanense (Spengler). The second is a new species of Cymatoceras, which resembles C. cenomanense (Schluter) but its suture is not so sinuous as in that species. The third is a new species of Anglonautilus, which is distinguished from A. undulatus (Sowerby) in its much weaker ribs and the development of a shallow ventral groove on its body-chamber. The group of strata in the studied area is subdivided into 8 members, A to G in ascending order, of which A to D are the Middle Campanian and E to G the Upper Campanian. The first species occurs in C and D, the second in F and the third probably in C. They are all of shallow open sea facies.View full abstractDownload PDF (4540K) -
NORIO FUJI1983 Volume 1983 Issue 132 Pages 230-252
Published: December 30, 1983
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSThe samples of a 200-meter core obtained from the present bottom in Lake Biwa, Central Japan for the investigations of the palaeoclimatic and palaeovegetational changes in and around the lake during the last 600, 000 years can be divided into 19 pollen zones from the view point of palynology. The palaeoclimatic change and the ages of glacial and interglacial stages display similarity to the palaeotemperature curve by oxygen isotope ratio determination from the Caribbean Sea. During the glacial stages or stadials, the typical vegetation thriving today in the Subpolar or Subalpine zone of Japan prevailed at the summit area and/or the montane area around Lake Biwa, and in the lowland around the lake, plants growing today in the Cool Temperate zone were distributed. In the interglacials and interstadials, the palaeovegetation in the higher area was characterized mainly by plants of the Cool Temperate zone and the present Temperate zone, and in the lowland, the palaeovegetation was composed mainly of broadleaved deciduous and evergreen trees growing in the Warm Temperate zone.View full abstractDownload PDF (2124K) -
SHINJIRO MIZUTANI, SATOSHI KIDO1983 Volume 1983 Issue 132 Pages 253-262_1
Published: December 30, 1983
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSThree new species of Radiolaria, Pantanellium foveatum, Dictyomitrella (?) kamoensis and Pachyoncus kamiasoensis, are described from the middle Jurassic siliceous shales in Kamiaso, Gifu Prefecture. These species together with other spumellarians and nassellarians characterize the Dictyomitrella (?) kamoensis-Pantanellium foveatum Assemblage, which is commonly found in the radiolarian assemblages recognized in the sedimentary complex of the Mino area, central Japan.View full abstractDownload PDF (1659K)
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