Relative dating diagram who is garrett hedlund currently dating
which friends we knew at which stage of our lives).
But unless we have been revising a CV or resum recently we may be less clear about the precise years in which particular things happened (that is, absolute chronology).
Free 5-day trial You may already know how to date a fossil with a rock.
Obviously, the fossil assemblages change from period to period.
Here the assemblages are represented by different symbols (star, square etc.), arranged in chronological order with the oldest at the bottom.
Relative dating, shown in Diagram 2, is like playing the slot machines: you want at least two identical things to line up at the same time. Here, the process of lining up contemporary assemblages reveals that the three sites have some chronological overlaps.
Fossil succession is based on the observation that certain assemblages, or groups, of animals and plants have lived during certain time periods over geologic history.
For example, human beings and modern elephants are part of the same assemblage because we live in the same time period.