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＜紀要論文＞
円盤状四放サンゴ群体を利用した秋吉生物礁複合体礁前面斜面の傾斜角の復元
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| 概要 | The Akiyoshi Limestone Group is a huge exotic limestone mass containing abundant shallow marine fossils, and is thought to have originated as an organic reef complex. Wellpreserved reef fades zonation... is observable in the Middle Carboniferous part of the Akiyoshi Limestone Group. Fossils of discodial rugose coral Ivanovia sp. are obtained from the Pseudostaffella antiqua Zone in the Minami-dai area of the western Akiyoshi-dai plateau. Distribution of Ivanovia sp. is restricted to the lower reef front and upper fore reef slope in the Akiyoshi Organic Reef Complex. Reconstruction of reef front slope gradient is undertaken using discoidal colonies of this coral. The relationships between basal planes of 10 Ivanovia colonies and geopetal planes on the reef front slope were measured by the use of stereonet projections. Consequently, it is confirmed that the slope was inclined about 30-40 degrees from the sea level in actuality.続きを見る |
| 目次 | I．はじめに II. Lingula化石産地の地質概略 III. 化石の産状 IV. 鴨庄層産Lingula化石に関する考察 V. むすび |
詳細
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| 登録日 | 2021.10.15 |
| 更新日 | 2022.06.20 |