| fossilshk | 2018-11-6 07:15 PM |
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韓國濟州島地質考察-大浦海岸柱狀節理 五角六角柱
上月到韓國的濟州島考察地質，於大浦海岸的柱狀節理是自然保護區, 沿海岸線大概2公里左右, 這些柱狀節理約在25萬至14萬年前從火山口流下來的熔岩冷卻後形成的, 當熔岩冷卻後逐漸收縮, 而形成了五角或六角形的柱狀結構, 這種火山岩屬於玄武岩, 外表跟香港地質公園的六角柱很相似, 但香港的是凝灰岩及流紋岩.
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| fossilshk | 2018-11-6 07:22 PM |
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大浦海岸柱狀節理
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| dragonfly | 2018-11-11 10:11 AM |
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| fossilshk可以周圍去睇石頭，羨慕! |
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