Jurassic and Lower Cretaceous radiolarian zonation in Japan and in the western Pacific
Jurassic and Lower Cretaceous radiolarian zonation in Japan and in the western Pacific
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DOI：
10.1111/j.1440-1738.1995.tb00138.x
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发表时间：
1995-06
期刊：
影响因子：
1.5
通讯作者：
A. Matsuoka
中科院分区：
文献类型：
--
作者：
A. Matsuoka
利用日本岛剖面和西太平洋海底的生物地层学资料，对整个侏罗纪和下白垩统的放射虫分带方案进行了记录。该分带适用于古太平洋中低纬度区。放射虫生物事件，如进化的第一次出现的生物层，第一次出现的生物层，最后出现的生物层被用来定义区。提出的11个区系依次为：Parahsuum simplum、Trillus elkhornensis、Laxtorum（？）jurassicum、褶状三球球藻（Tricolocapsa plicarum）、圆锥三球球藻（Tricolocapsa conexa）、柱球藻（Stylocapsa（？）spiralis、Hsuum maxwelli、Pseudodictyomitra arbittiva、Pseudodictyomitra carpatica、Cecrops sep-temporatus和Acanthocirus carinatus带。这些区域的初步年龄分配。
A radiolarian zonal scheme for the entire Jurassic and Lower Cretaceous using biostratigraphic data from both Japanese Island sections and the western Pacific seafloor is documented. The zonation is applicable to low and middle paleolatitude portions of the Paleo-Pacific ocean. Radiolarian bio-events such as the evolutionary first appearance biohorizon, first occurrence biohorizon, and last occurrence biohorizon were used to define zones. The 11 zones proposed are, in ascending order, Parahsuum simplum, Trillus elkhornensis, Laxtorum(?) jurassicum, Tricolocapsa plicarum, Tricolocapsa conexa, Stylocapsa(?) spiralis, Hsuum maxwelli, Pseudodictyomitra primitiva, Pseudodictyomitra carpatica, Cecrops sep-temporatus, and Acanthocircus carinatus zones. Preliminary age assignments for these zones are presented.