生痕化石 沉積岩中常會見到許多奇形怪狀的圖案,這些圖案是數百萬年前生物在此覓食、爬行、休息、脫逃或居住時所留下來的痕跡,經過泥沙長期的掩埋,便形成生物生活痕跡的化石,簡稱生痕化石。管壁上有粒狀突瘤的可能是居住場所,這是生物為了防止住家倒塌而做的,管壁光滑的就可能是攝食或爬行的痕跡。 分布於沉積岩層中,如北部海岸鼻頭角、野柳等
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