Geologic time scale relative dating dating mila
Apart from the Late Heavy Bombardment, events on other planets probably had little direct influence on the Earth, and events on Earth had correspondingly little effect on those planets.
Construction of a time scale that links the planets is, therefore, of only limited relevance to the Earth's time scale, except in a Solar System context.
Therefore, the second timeline shows an expanded view of the most recent eon.
In a similar way, the most recent era is expanded in the third timeline, and the most recent period is expanded in the fourth timeline.
Steno's ideas also lead to other important concepts geologists use today, such as relative dating.
For example, in North America, the Lower Cambrian is called the Waucoban series that is then subdivided into zones based on succession of trilobites.The first three of these can be referred to collectively as the Precambrian supereon.Eons are divided into eras, which are in turn divided into periods, epochs and ages.The following four timelines show the geologic time scale.The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon.