At dusk we head down the steep slope to Fengshan finding on the other side of Wuling Bridge a huge rock made from a petrified seashell. Such specimens are plentiful in the waterfall area, evidence of Taiwan's undersea past.
回村落時過了五鄰吊橋可以停下來，在左側尋找一塊背面嵌滿了海螺化石的大石頭。不僅在此，瀑布周圍的巨石上也可發現與石塊化為一體的海螺，或許可為台灣是由海底陸塊昇起的說法提供佐證。