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Title :Updated radiolarian zonation for the Jurassic in Japan and the western Pacific
Authors :Matsuoka, Atsushi
Ito, Tsuyoshi
Publisher :新潟大学理学部
Issue Date :Mar-2019
Journal Title :Science reports of Niigata University. (Geology)
Volume :34
Start Page :49
End Page :57
ISSN :1349-1237
Abstract :An updated version from radiolarian zonal scheme in the 1990s for the Jurassic in Japan and the western Pacific is presented and vertical distributions of selected radiolarian species are illustrated. The major modifications are as follows: The Bipedis horiae Zone (JR0) is added below the Parahsuum simplum Zone (JR1). The base of the Bipedis horiae Zone (JR0) is defined by the last occurrence biohorizon of Haeckelicyrtium breviora Sugiyama and corresponds to the Triassic–Jurassic boundary. The base of the Parahsuum simplum Zone is dated within the Sinemurian. The Tricolocapsa plicarum Zone (JR4), Tricolocapsa conexa Zone (JR5), Stylocapsa(?) spiralis Zone (JR6), and Pseudodictyomitra primitiva Zone (JR8) are modified to the Striatojaponocapsa plicarum Zone (JR4), Striatojaponocapsa conexa Zone (JR5), Kilinora spiralis Zone (JR6), and Loopus primitivus Zone (JR8), respectively, in accordance to the change of generic assignment of zone-nominal species.
Keywords :Jurassic
radiolaria
zonation
revision
Japan
western Pacific
Type Local :紀要論文
Language :eng
Format :application/pdf
URI :http://hdl.handle.net/10191/51355
fullTextURL :http://dspace.lib.niigata-u.ac.jp/dspace/bitstream/10191/51355/1/34_49-57.pdf
Appears in Collections:02 Science reports of Niigata University. (Geology)

Please use this identifier to cite or link to this item: http://hdl.handle.net/10191/51355