Page 40 - 雕鐫海之角

豆腐岩又稱棋盤岩，岩體常有兩組節理，其

中一組的方向與岩層走向平行，另外一組則大約
生痕化石 與岩層的走向垂直。堅硬的岩層被兩組節理切割 豆腐岩

後的破裂面，漸漸地被侵蝕而擴大，形成了一塊
Trace fossil 塊類似豆腐外型的岩塊，因此被稱為豆腐岩。 Chessboard rock

鼻頭角、龍洞地區的岩層中，可以看到許 The northeastern coastline is famous as a rocky
coast for its variety of tilting sedimentary rocks, which
多生物痕跡的化石。砂岩中有各式各樣的管狀或
contain many fossils and trace fossils. Within the rock
條狀的花紋，這些奇怪的花紋是由淺海海底或濱
bedding, there are plenty of fossils and trace fossils
海的生物造成的。海底的生物在海床表面爬行或 that were laid down with the original deposition.

鑽入砂層時，會遺留下牠們活動的痕跡，這些痕 These provide evidence of the original shallow sea
environment. Sand pipes are the most common trace
跡就被完整的保存在岩層中，形成生物的遺跡化
fossils here, but the creatures that formed them have
石，稱為生痕化石。沙棒是其中最具代表性的一 long disappeared.
種，有助於我們瞭解這個地區過去的沉積環境。

Chessboard rock, also known as bean curd rock,
is formed in sandstone where two parallel sets of
joints cross at an angle of about 90° with a dip slope
of 15-20°. Weathering processes and wave erosion
separate these into small blocks.

地質圖書 Geopark at Northeast and Yilan Coast National Scenic Area
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