@article{oai:kanazawa-u.repo.nii.ac.jp:00057374,
 author = {Yamamoto, Shinya and Hasegawa, Takashi and 山本, 真也 and 長谷川, 卓},
 issue = {4},
 journal = {地質学雑誌, The Journal of the Geological Society of Japan},
 month = {},
 note = {北海道穂別北部地域のMiddle-Upper Turonian亜階で，国際的に年代指標性のある浮遊性有孔虫が連続的に産出し，重要な浮遊性有孔虫帯境界であるHelvetoglobotruncana helvetica帯上限の層序学的位置を推定することができた．更に，国際的に同種と共産するとされている浮遊性有孔虫３種との共産が確認され，鍛冶屋の沢ルートの上部がほぼH. helvetica帯最上部であることが明らかになった．同ルートの炭素同位体比の変動は，汎世界的なMiddle-Upper Turonian亜階の変動と調和的であり，浮遊性有孔虫層序から推定された年代を支持する.
また，Middle Turonian亜階でArchaeoglobigerina属がH. helveticaと共産することから，同属の初出現の時期は従来の知見より古いことが示された．, Continuous occurrence of international planktonic foraminiferal index species was recognized in the Middle to Upper Turonian successions in the Hobetsu area, Hokkaido, Japan. It enables us to assume the stratigraphic position of the upper limit of the Helvetoglobotruncana helvetica Zone, an important planktonic foraminiferal zonal boundary. Helvetoglobotruncana praehelvetica, Marginotruncana pseudolinneiana, and Praeglobotruncana gibba, which are also internationally recognizable species, occur associated with Helvetoglobotruncana helvetica. This association indicates that stratigraphic top of the Kajiyanosawa route should be assigned to close to the top of the total range of Helvetoglobotruncana helvetica. Correlation of the carbon isotope fluctuation through the Kajiyanosawa route with that of well-studied sections supports our chronostratigraphic interpretation from planktonic foraminiferal biostratigraphy
Concurrence of genus Archaeoglobigerina with Helvetoglobotruncana helvetica in the Middle Turonian of this area demonstrates that the timing of the first appearance of Archaeoglobigerina is older than previous known., 金沢大学理工研究域自然システム学系},
 pages = {243--256},
 title = {北海道穂別地域に分布するセノマニアン－チューロニアン階の浮遊性有孔虫層序},
 volume = {112},
 year = {2006}
}