Some rocks according to their use or texture are classified into different types. Know more about Banded iron formation Texture and Conglomerate Texture. Types of Banded iron formation are Algoma-type , Lake Superior-type, Superior-type and Taconite whereas the types of Conglomerate are Not Available.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. Banded iron formation was not used to create pictographs whereas Conglomerate 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. Banded iron formation was not used to create petroglyphs whereas Conglomerate was used to create petroglyphs.