Geological Time

Geological Time refers to the vast time scale used by geologists and other Earth scientists to describe the timing and relationships of events in Earth's history.

The Law of Superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

Index Fossils are fossils of organisms that were widespread but only existed for a short period of time, used to date and correlate the age of rock layers.

Radiometric Dating is a method used to date materials by measuring the amount of radioactive decay of isotopes within the materials.

The Grand Canyon provides a clear view of the geological history of the Earth, showcasing layers of rock that represent different time periods.

A fault is a fracture or zone of fractures between two blocks of rock, which can cause displacement and is important in understanding geological events.

Relative age is the age of a rock or fossil in comparison to other rocks or fossils, while absolute age is the actual age in years.

Sedimentary rocks are formed by the accumulation and compaction of mineral and organic particles, often found in layers.

Scientists investigate natural phenomena, test hypotheses, and share findings to build a consensus on geological time and events.

The principle of original horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.