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