Editing Geologic time scale (section)

=== Lunar (selenological) time scale ===
The [[Geology of the Moon|geologic history]] of Earth's Moon has been divided into a time scale based on [[Geomorphology|geomorphological]] markers, namely [[impact crater]]ing, [[volcanism]], and [[erosion]]. This process of dividing the Moon's history in this manner means that the time scale boundaries do not imply fundamental changes in geological processes, unlike Earth's geologic time scale. Five geologic systems/periods ([[Pre-Nectarian]], [[Nectarian]], [[Imbrian]], [[Eratosthenian]], [[Copernican period|Copernican]]), with the Imbrian divided into two series/epochs (Early and Late) were defined in the latest Lunar geologic time scale.<ref name="Wilhelms_1987">{{Cite book |last=Wilhelms |first=Don E. |title=The geologic history of the Moon |series=Professional Paper |publisher=United States Geological Survey |year=1987 |doi=10.3133/pp1348}}</ref> The Moon is unique in the Solar System in that it is the only other body from which humans have rock samples with a known geological context.
{{Timeline Lunar Geological Timescale}}