Alternatively, mineral salts from surrounding rocks gradually replace the hard organic material, to give a cast in a process termed petrification, as in the various petrified forests dotted around the globe.
Alternatively, mineral salts from surrounding rocks gradually replace the hard organic material, to give a cast in a process termed petrification, as in the various petrified forests dotted around the globe.
另一种情况是，周围岩石中的矿物质盐逐渐取代了坚硬的有机物质，在称为石化的过程中而形成，于是在全球形成了点状分布的石化森林。