Dike terrain appears in Shanshui Neighborhood and Shuokang Neighborhood of Pengnan District and Shihwei Neighborhood in the City. One or a couple of dikes exposed to wave erosion platform or surface. Every time when the waters are down, we can see dikes just exposed in front of us if we take a carefully look. So next time when you come to the beach, do not forget to look at the tidal flat after waters are down to see whether there is a water column like or long bar shaped rock layer. The dikes in Shanshui and Shuokang go from west to east in the length of 50 meters separately. Generally, after the top layer was eroded, we can see the uncovered dikes.

Dike, (or called the block of rocks or wall of rocks) are formed because that the lava invaded into nearby rock’s fracture and solidified. It is a nearly slate-shaped erect invaded rock. Beside the basalt of silicon and alkalinity, there are a kind of dikes made of Glenmuirite along the coast of Shanshui and Suokang. Glenmuirite is an alkaline rock with the small gray invaded rock bed invaded into the rock layer of basalts. The main components are fine crystalline to middle crystalline augite and plagioclase, following the ilmenite and olivine with long and thing splits in slate or arrow shapes. The stomas of this rock often have sub minerals of quartz or jade.