NAGAI, Hiromi

SHIRAKI, Keiichi

永井, ひろ美

白木, 敬一

In June 1883, KIKUCHI Yasushi submitted his dissertation thesis of the titles “Report on the Geology of the Prov. Awa in Shikoku” and “On some Mesozoic Fossils of the Province Awa in Shikoku” to Carl Christian Gottsche, Professor of Geology and Paleontology of the University of Tokyo. He mentioned in this thesis the occurrence of radiolarian fossils such as Cenosphaera and Dictyomitra , which he considered the Cretaceous, from quartzite in the southeastern part of the Province Awa, and it was the first report of radiolarian fossils from the Japanese Islands (Nagai, 1995b). Here we re-examined in more details his Cretaceous radiolarian fossils based on the description of Zittel (1876), and confirmed KIKUCHI’s belief that the age of these radiolarians is Cretaceous. Naumann (1885) considered, however, that the radiolarian remains were included in the Paleozoic strata on the basis of his study on structural geology in Shikoku. Yehara (1926), who started a new study on radiolarian fossils, also followed the views of Naumann. Thus, it seems likely that the first report of Cretaceous radiolarians in Japan by KIKUCHI has been missed over hundred years

菊池安による本邦初の放散虫化石の記載

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