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The Three Sisters Rock Formations
三姐妹岩
The Three Sisters Rock Formations
三姐妹岩风景
The Narrabeen Sandstone forming the Three Sisters has strong vertical jointing in a grid like pattern. Over time, erosion widened these joints to leave the vertical turrets of sandstone. There are many horizontal layers of erosion resistant ironstone that have also helped to retain these formations.
组成三姐妹岩的纳拉宾砂岩有较深的垂直柱状节理（裂缝）。多年来，各种侵蚀使得这些裂缝不断扩大，最终形成了直立的塔形峰。岩石水平层丰富的抗侵蚀铁矿石层面也有助于维持这种独特的构造。