Lower Cretaceous deposits beneath the Yezo Group in the Urakawa area, Hokkaido
نویسندگان
چکیده
منابع مشابه
Mesorbitolina (Cretaceous larger foraminifera) from the Yezo Group in Hokkaido, Japan and its stratigraphic and paleobiogeographic significance
In this paper, we describe an Aptian (Early Cretaceous) larger foraminiferal species Orbitolina (Mesorbitolina) parva from the limestone olistoliths in the lower part of the Yezo Group in the Yubari-Ashibetsu area, central Hokkaido and from limestone pebbles in the lowermost part of the Yezo Group in the Nakagawa area, northern Hokkaido. This is the first report of this species from the circum-...
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چکیده ندارد.
15 صفحه اولProximal cretaceous-tertiary boundary impact deposits in the Caribbean.
Trace element, isotopic, and mineralogic studies indicate that the proposed impact at the Cretaceous-Tertiary (K-T) boundary occurred in an ocean basin, although a minor component of continental material is required. The size and abundance of shocked minerals and the restricted geographic occurrence of the ejecta layer and impact-wave deposits suggest an impact between the Americas. Coarse boun...
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ژورنال
عنوان ژورنال: The Journal of the Geological Society of Japan
سال: 1981
ISSN: 0016-7630,1349-9963
DOI: 10.5575/geosoc.87.527