Why arent sink holes found in areas where a sandstone is found at the surface?

Sinkholes typically form in regions underlain by soluble bedrock, such as limestone or gypsum, which can be easily eroded by water, creating voids. Sandstone, on the other hand, is a more resistant and less soluble rock, making it less prone to the formation of sinkholes. In areas where sandstone is at the surface, the geological conditions are not conducive to the dissolution process that leads to sinkhole development. Thus, sinkholes are less likely to occur in sandstone-dominated terrains.