GENERAL GEOLOGY

Detailed explanation-1: -geologic column: an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom. Evidence of changing conditions is recorded in the rock layers of Earth’s crust. Geologic time scale shows the development of Earth and of life on Earth.

Detailed explanation-2: -A geologic column is an ordered arrangement of rock layers based on the relative ages of the rocks, with the oldest rocks at the bottom. Scientists develop geologic columns to piece together the geologic record of a large area.

Detailed explanation-3: -law of superposition, a major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence.

Detailed explanation-4: -The layers in order are Cambrian, Ordovician, Silurian, Devonian, Carboniferous, (Mississippian and Pennsylvanian), Permian, Triassic, Jurassic, Cretaceous, Tertiary, and Quaternary. Sedimentary rock is the type of rock in which fossils are most likely to form.

Detailed explanation-5: -The relative age of a rock is its age in comparison with other rocks. If you know the relative ages of two rock layers, you know which is older and which is younger, but you do not know how old the layers are in years.