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 ...

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 ...

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 ...

There are over 5,000 known types of minerals. Just a few minerals make up most of the rocks we see, though: feldspars, amphiboles, quartz, olivine, garnet, micas, calcite, and pyroxenes.