Chalk, limestone, shale, and sandstone are all examples of sedimentary rocks. All these different sedimentary rocks are formed from the broken remains of other rocks that become joined together.

Mudstone, shale, and limestone are examples of sedimentary rock likely to ... Throughout the earth's history, each of the three rock types has been continuously formed and recycled into other types of ...

Mysterious tunnels in desert rocks may be the work of unknown microbes, hinting at a hidden world inside marble and limestone ...

Each piece is carved from a single slab of one of three varieties of Irish limestone. It juxtaposes the textures and ...