Spike island is a limestone. With the Permian or about 295-250 million years. Because the limestone has eroded aquatic fusion easily, so the various islands in the Bay Nga have strange shapes.The original Huangshan and the island's against the east side is connected as one, and on the land, the movement of the earth crust at a later time. There is a big fault in the cross area Phang-Nga Bay on the west sideFault fault causes a small track Madang to see his faults against each other. The move, cracks, and cracks found in Huangshan limestone. In addition,The Khao Tapu separated as he nitrite peak at about 6 sea,000 years. With the above current levels about 4 meters, fluctuation of sea water. Have eroded Huangshan a line welded water erosion rock. Indent at such a level. Later, the scaled down at an altitude of about 2.5 meters above sea level at present. A new lower part of Huangshan sea erosion caused the water erosion rock new is the level of the COD deflated most Huangshan style is unique