Shaguchuan(old sandy boat)stone in the Ape-man mountain has the same origin as the Ape-man stone．Magma with Si02 more than at 65％is called acid magma，with Si02 52-65％ is called intermediate magma，with Si02  45-52％ is called basic magma .Normally, the volcanic rock formed by acid magma erupted into the sea is called quartz keratophre .