Sandstone




 * Sandstone is formed by sand laid down on the bottom of bodys of water.
 * Petroleum and natural gas are usually found in Sandstone.
 * They do not form on the surface but, Sandstone floats to the surface of the water by percolating through water-saturated Sandstones.
 * Sandstones are commonly grey, red, and brown but green and some other colours are found.
 * Green Sandstones contain fossil shells and iron oxides.