What rock is prehistoric?

Prehistoric rocks are typically sedimentary rocks, such as sandstone, limestone, and shale, which formed from sediments deposited in ancient environments. These rocks often contain fossils, providing valuable insights into the Earth's history and the life forms that existed during different geological periods. Additionally, igneous and metamorphic rocks can also be considered prehistoric if they were formed during the Earth's early history. Overall, the term "prehistoric rock" refers to any rock that dates back to a time before written records.