Radiolarians and calcareous nannofossils from the uppermost Jurassic and Lower Cretaceous strata of Japan and Tethyan regions

Detailed biostratigraphic evidence of radiolarians and calcareous nannofossils in the Upper Jurassic to Lower Cretaceous sequences of Shikoku Island, Japan and the Tethyan region along the Breggia River, Switzerland is presented. Nannoflora observed in the nine Shikoku samples are the oldest observe...

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Bibliographic Details
Published in:Micropaleontology 1986-01, Vol.32 (2), p.97-128
Main Authors: Aita, Yoshiaki, Okada, Hisatake
Format: Article
Language:English
Subjects:
Abdomen
algae
Asia
Biostratigraphy
Breggia River
calcareous composition
Central Europe
continental drift
Cretaceous
Ditrabs sansalvadorensis
Drilling
Europe
Far East
Geology
Holotypes
Invertebrata
Japan
Jurassic
Komikuchi Formation
Lower Cretaceous
Maiolica Limestone
Marine
Mesozoic
microfossils
Micropaleontology
nannofossils
Nassellina
new taxa
Osculosida
Plantae
Protista
Radiolaria
Seas
SEM data
Shikoku
Shiraishi River
Specimens
Spumellina
stratigraphy
Strictures
Switzerland
Tethys
thallophytes
Thorax
Torinosu Group
Upper Jurassic
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Summary:Detailed biostratigraphic evidence of radiolarians and calcareous nannofossils in the Upper Jurassic to Lower Cretaceous sequences of Shikoku Island, Japan and the Tethyan region along the Breggia River, Switzerland is presented. Nannoflora observed in the nine Shikoku samples are the oldest observed so far from any inland sections along the western Pacific region and are of latest Jurassic to possibly early Berriasian. Thirty-five radiolarian species are identified in this sequence, and six of them are described as new species. The floral and faunal contents of the Shikoku and Breggia sections are similar, and a newly proposed radiolarian zone, Ditrabs sansalvadorensis Zone, is commonly applicable. The estimated age of this zone ranges from the late Tithonian to Valanginian and is based upon the nannoflora of the Sugegadani (Shikoku section) and Maiolica Limestone samples.
ISSN:0026-2803
1937-2795
DOI:10.2307/1485626