Longtou Rock. The geology of Lanyu is mainly composed of hornblende-bearing andesitic lava and basaltic agglomerate, as well as Pleistocene red soil layers, uplifted coral reefs, and Holocene. The geology of Lanyu is mainly composed of hornblende-bearing andesitic lava and basaltic agglomerate, as well as Pleistocene red soil layers, uplifted coral reefs, and Holocene alluvial deposits, colluvial deposits, and coastal fringing reefs. Through the natural processes of sea erosion and weathering, Lanyu's most interesting and peculiar rock formations have been shaped.
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