Paleontological Research
Online ISSN : 1880-0068
Print ISSN : 1342-8144
ISSN-L : 1342-8144
Age calibration of megafossil biochronology based on Early Campanian planktonic foraminifera from Hokkaido, Japan
KAZUYOSHI MORIYAHIROSHI NISHIKAZUSHIGE TANABE
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2001 Volume 5 Issue 4 Pages 277-282

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Abstract

The occurrence of an Early Campanian planktonic foraminiferal assemblage consisting of Globotruncana arca, G. linneiana, Rosita fornicata and R. patelliformis is first reported from the Upper Haborogawa Formation exposed in the Haboro area, northwestern Hokkaido, Japan. This finding supports the previous interpretation that the Santonian/Campanian boundary can be placed at the basal part of Inoceramus (Platyceramus) japonicus Zone of the inoceramid biostratigraphy.

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