Some rocks according to their use or texture are classified into different types. Know more about Marl Texture and Theralite Texture. The types of Marl and Theralite are .During historic times, some rocks depending on their hardness were used to create Pictographs and Petroglyphs. Rocks which are hard were generally not used. Pictographs are paintings or drawings that have been placed or created on the surface of rock. Marl and Theralite were for creating pictographs. Petroglyph is an image which is carved into a rock. These are images created by removing part of a rock surface by incising, picking, carving or abrading, as a form of rock art. Marl and Theralite were for creating petroglyphs.