島根大学総合理工学部地球資源環境学教室
ISSN:1343-9774
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島根大学地球資源環境学研究報告 13
1994-11-30 発行
鳥取層群からのOperculinaの産出とその生層序学的・古生物地理学的意義
New occurrence of Operculina from the Tottori Group, and its biostratigraphical and paleozoogeographical significance
松本 俊雄
ファイル
内容記述（抄録等）
The larger foraminifera，Operculina，has recently been discovered in the Miocene Tottori Group．The biostratigraphical and paleozoogeographical significance of this occurrence are as follows；
（1）The features of the specimen are identical with those of Operculanate japonica． The horizon of Operculina complanata japonica corresponds commonly to the N．8 and rarely to the base of the N．9．The occurrence of Operculina has brought an addition of fossils indicating geologic age in the Tottori Group．
（2） The Tottori area has been assigned to in the Operculina-Miogypsina zoogeographic province on the Japan Sea coast side in the late Early Miocene to early Middle Miocene．This assumption is consistent with the new occurrence of Operculina．
（1）The features of the specimen are identical with those of Operculanate japonica． The horizon of Operculina complanata japonica corresponds commonly to the N．8 and rarely to the base of the N．9．The occurrence of Operculina has brought an addition of fossils indicating geologic age in the Tottori Group．
（2） The Tottori area has been assigned to in the Operculina-Miogypsina zoogeographic province on the Japan Sea coast side in the late Early Miocene to early Middle Miocene．This assumption is consistent with the new occurrence of Operculina．
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