Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group
The authors have made a palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group which is distributed in the coastal areas between Kushiro and Nemuro. They have collected 48 samples in total from the Oborogawa-Hamanaka, Akkeshi and Tokotan Formations and distinguis...
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1990
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ftnagasakiuniv:oai:nagasaki-u.repo.nii.ac.jp:00020654 2024-09-15T18:31:04+00:00 Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group 根室層群厚岸層および床潭層の花粉層位学的考察 高橋, 清 植田, 芳郎 1990-07 application/pdf https://nagasaki-u.repo.nii.ac.jp/record/20654/files/kyoyoS31_01_02_t.pdf jpn jpn 長崎大学教養部紀要. 自然科学篇 1 31 13 37 AN10352293 02871319 https://nagasaki-u.repo.nii.ac.jp/record/20654/files/kyoyoS31_01_02_t.pdf VoR 1990 ftnagasakiuniv 2024-08-23T06:19:40Z The authors have made a palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group which is distributed in the coastal areas between Kushiro and Nemuro. They have collected 48 samples in total from the Oborogawa-Hamanaka, Akkeshi and Tokotan Formations and distinguished 311 palynomorphs which consist of 121 spores, 55 gymnospermous pollen and 135 angiospermous pollen, excepting phytomicroplankton. Recently it was considered that the Nemuro Group may cover Campanian-Danian time. In fact, Yoshida & Kiminami (1980) and Yoshida (1981) pointed out that the Akkeshi Formation belongs undoubtedly to Maastrichtian time by some ammonoids and inoceramid and the Tokotan Formation is in Danian time by planktonic foraminifera and nannofossils. The authors have examined 34 angiospermous pollen, 9 gymnospermous pollen, and 18 spores which were picked up from among 311 palynomorphs as a good age-indicator. Consequently, these from the Akkeshi Formation indicate compatibly Maastrichtian time. In the Tokotan Formation angiospermous pollen grains increase more in number and kind than in the Akkeshi Formation, but Aquilapollenites pollen group decreases in opposition and two new species of Aquilapollenites appear as a newcomer. After all, they could find no evidence supporting Danian time in palynological standpoint. 長崎大学教養部紀要. 自然科学篇. 1990, 31(1), p.13-37 departmental bulletin paper Other/Unknown Material Planktonic foraminifera NAOSITE: Nagasaki University Academic Output SITE |
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Open Polar |
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NAOSITE: Nagasaki University Academic Output SITE |
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ftnagasakiuniv |
language |
Japanese |
description |
The authors have made a palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group which is distributed in the coastal areas between Kushiro and Nemuro. They have collected 48 samples in total from the Oborogawa-Hamanaka, Akkeshi and Tokotan Formations and distinguished 311 palynomorphs which consist of 121 spores, 55 gymnospermous pollen and 135 angiospermous pollen, excepting phytomicroplankton. Recently it was considered that the Nemuro Group may cover Campanian-Danian time. In fact, Yoshida & Kiminami (1980) and Yoshida (1981) pointed out that the Akkeshi Formation belongs undoubtedly to Maastrichtian time by some ammonoids and inoceramid and the Tokotan Formation is in Danian time by planktonic foraminifera and nannofossils. The authors have examined 34 angiospermous pollen, 9 gymnospermous pollen, and 18 spores which were picked up from among 311 palynomorphs as a good age-indicator. Consequently, these from the Akkeshi Formation indicate compatibly Maastrichtian time. In the Tokotan Formation angiospermous pollen grains increase more in number and kind than in the Akkeshi Formation, but Aquilapollenites pollen group decreases in opposition and two new species of Aquilapollenites appear as a newcomer. After all, they could find no evidence supporting Danian time in palynological standpoint. 長崎大学教養部紀要. 自然科学篇. 1990, 31(1), p.13-37 departmental bulletin paper |
format |
Other/Unknown Material |
author |
高橋, 清 植田, 芳郎 |
spellingShingle |
高橋, 清 植田, 芳郎 Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group |
author_facet |
高橋, 清 植田, 芳郎 |
author_sort |
高橋, 清 |
title |
Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group |
title_short |
Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group |
title_full |
Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group |
title_fullStr |
Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group |
title_full_unstemmed |
Palynostratigraphic investigation of the Akkeshi and Tokotan Formations of the Nemuro Group |
title_sort |
palynostratigraphic investigation of the akkeshi and tokotan formations of the nemuro group |
publishDate |
1990 |
url |
https://nagasaki-u.repo.nii.ac.jp/record/20654/files/kyoyoS31_01_02_t.pdf |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
長崎大学教養部紀要. 自然科学篇 1 31 13 37 AN10352293 02871319 https://nagasaki-u.repo.nii.ac.jp/record/20654/files/kyoyoS31_01_02_t.pdf |
_version_ |
1810472673634942976 |