Qingwan Basalt Introduction
The Penghu Archipelago is primarily composed of basalt, formed by the repeated eruptions of lava cooling on the surface from fissures in the earth's crust. The earliest volcanic lava dates back approximately 18 million years, with a tranquil eruption occurring around 18 million years ago and volcanic activity ceasing about 8 million years ago. The basaltic composition has created unique square-shaped mountains, with steep rock walls that have developed various unique geological formations due to long-term weathering, wind erosion, and marine erosion. The rapid cooling of lava often leads to tension that creates polygonal joint fractures in the rocks, known as columnar joints. These fractures can be straight, curved, or inclined in various directions, becoming the most distinctive feature of Penghu's basalt landscape. In Magong, on the left side of County Road 201 towards Fenggui, one can see the towering Qingshan columnar basalt by the roadside. Due to prolonged weathering and erosion, Penghu's basalt exhibits different appearances, with Qingshan being one of the most notable examples of columnar basalt. In Qingshan, visitors can not only appreciate the magnificent and majestic columnar basalt but also enjoy the coastal scenery. [Recommended stay time] 1 hour.
Qingwan Basalt
