火山角礫岩是指岩漿經火山爆發碎裂成大於64mm的岩塊所膠結組成的岩石；由於其出火山口時已是固態，然後再經碎裂作用，故其顆粒大多成角礫狀。赤嶼的火山角礫岩和火山碎屑岩，分布於赤嶼的底層及其週邊的海蝕平台上，但因海水侵蝕作用，風化相當嚴重。上層有玄武岩薄層覆蓋的赤嶼西側海蝕平台，長年遭受海水的拍打侵蝕與切割，由於差異侵蝕的作用，火山角礫岩層較為鬆軟而被淘空，形成一個個的蕈狀石，景觀甚為奇特。近年來由於颱風的侵襲，造成蕈狀石的斷裂而崩倒，非常可惜。澎湖北海的鐵砧嶼，其下層的火山角礫岩層，長期受到波浪侵蝕，形成澎湖最大的海蝕洞，景觀美麗。本標本採集自望安馬鞍山嶼。
火山角礫岩是指岩漿經火山爆發碎裂成大於64mm的岩塊所膠結組成的岩石；由於其出火山口時已是固態，然後再經碎裂作用，故其顆粒大多成角礫狀。赤嶼的火山角礫岩和火山碎屑岩，分布於赤嶼的底層及其週邊的海蝕平台上，但因海水侵蝕作用，風化相當嚴重。上層有玄武岩薄層覆蓋的赤嶼西側海蝕平台，長年遭受海水的拍打侵蝕與切割，由於差異侵蝕的作用，火山角礫岩層較為鬆軟而被淘空，形成一個個的蕈狀石，景觀甚為奇特。近年來由於颱風的侵襲，造成蕈狀石的斷裂而崩倒，非常可惜。澎湖北海的鐵砧嶼，其下層的火山角礫岩層，長期受到波浪侵蝕，形成澎湖最大的海蝕洞，景觀美麗。本標本採集自望安馬鞍山嶼。
Volcanic breccia refers to the magma that has been broken into rocks larger than 64mm by volcanic eruption.Asthe magma is solid when it exits the craterthen undergoes fragmentation, most of its particles are breccia-like.The volcanic brecciapyroclastic rocks of Chiyu are distributed on the bottom layer of Chiyuthe surrounding marine erosion platforms, but due to seawater erosion, the weathering is quite serious.Onthe west side of Chiyu, the marine erosion platform whose upper layer is covered with a thin layer of basalt has been slapped, eroded,cut by seawater for years. Due to the effect of differential erosion, the volcanic breccia layersare relatively softcan be emptied easily, forminga very peculiarlandscape of pedestal rocks. However, they werebrokencollapsed due to the hit of typhoons in recent years.It is indeed a pity. Thevolcanic breccia layer below Tiezhenyu in the North Sea of Penghu has long been eroded by waves, forming the largest marine erosion hole in Penghu. It is really a beautiful landscape. This specimen was collected from MaanshanIslet of Wang-an Township.
