Anorthosite and Marl Types and Facts

Types of Anorthosite and Marl

Some rocks according to their use or texture are classified into different types. Know more about Anorthosite Texture and Marl Texture. Types of Anorthosite are Proterozoic Anorthosite and Archean Anorthosite whereas the types of Marl are Clay Marl ,Blue Marl, Red Marl, High Bank Marl, Shell Layer Marl, Under Shell Layer Marl, Sand Marl, Green Marl, Grey Marl and Clayey Marl.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. Anorthosite was not used to create pictographs whereas Marl is used to create 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. Anorthosite was not used to create petroglyphs whereas Marl was used to create petroglyphs.