Greywacke and Oil shale Types and Facts

Types of Greywacke and Oil shale

Some rocks according to their use or texture are classified into different types. Know more about Greywacke Texture and Oil shale Texture. Types of Greywacke are Greywacke whereas the types of Oil shale are Carbonate-rich Shale, Siliceous Shale and Cannel Shale.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. Greywacke and Oil shale 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. Greywacke and Oil shale were for creating petroglyphs.