Sedimentary rocks are formed by small rock pieces ... sediment which was carried in transport is laid down. 3 Sedimentation Layers of sediment form on top of each other in sedimentation.

There are three main types of rock: igneous rock ... such as water and wind and deposited elsewhere in layers. Over time, these layers build up and solidify, becoming sedimentary rock. Organisms can ...

What Was Happening on Earth at This Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary rock ... as early as 3.4 billion years ago.

There are three general approaches that allow ... The principle of superposition states that in an undeformed sequence of sedimentary rocks, each layer of rock is older than the one above it ...

These layers of sedimentary rock were deposited in Cambrian time, when another shallow sea covered this region. Among the fossilized remains found within these layers are brachiopods, trilobites ...