The characteristics of the rocks that hold fossils can be as informative as the fossils themselves. There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all ...

For example, small pebbles of rock are rolled along a river-bed. 2 Deposition In deposition, sediment which was carried in transport is laid down. 3 Sedimentation Layers of sediment form on top of ...

Common types of flagstone include sandstone ... and they’re usually up to 3 inches in diameter. River rock can also feature stripes, striations, or speckles. One unifying trait is that all ...