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Volume 65 (2011)
- Issue 6 Pages 219-
- Issue 5 Pages 183-
- Issue 4 Pages 135-
- Issue 3 Pages 93-
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 65, Issue 6
Displaying 1-2 of 2 articles from this issue
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Kikuji MATSUOKA, Akira YAOArticle type: Article
2011Volume 65Issue 6 Pages 219-229
Published: November 25, 2011
Released on J-STAGE: May 16, 2017
JOURNAL FREE ACCESSThe middle Jurassic Kamiyoshida Unit is a member of the Northern Chichibu Belt distributed in the eastern Kanto Mountains, central Japan. The Kamiyoshida Unit can be divided into geologically separated two subunits; the Tatsugaya and Kabasaka Subunits that appear difference in lithology and radiolarian age. From the mudstone of the younger Tatsugaya Subunit, we obtain the characteristic radiolarian species of Striatojaponocapsa conexa Zone, which extends the depositional period of the Kamiyoshida Unit up to early Callovian.View full abstractDownload PDF (2695K) -
Tsunemasa SHIKIArticle type: Article
2011Volume 65Issue 6 Pages 231-235
Published: November 25, 2011
Released on J-STAGE: May 16, 2017
JOURNAL FREE ACCESSThe new definition of "Quaternary Period" was ratified by IUGS on 30, June, 2009. The ratification means that we, mankind, recognized specific features of the time when we (genus Homo) appeared and spread like cancer over the earth's surface. As a results, an abnormal environmental change and mass extinction is happening now. The definition concerns chronological periodization but not mere division of geohistorical phenomenon processes. The past long and confused discussion about the definition problem seems induced by a world-wide lack of understanding about the distinction of the chronological periodization and division of the geohistorical process. It must be noted that the need for a distinction between the two kinds of geologic time is accord with the fundamental nature of geology as a "complex system" science.View full abstractDownload PDF (820K)
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