Relative age dating powerpoint
Relative time can not determine the actual year a material was deposited or how long deposition lasted; it simply tell us which events came first.This process lead to a system of time containing eons, eras, periods, and epochs all determined by their position in the rock record.This feature is produced by changes in deposition over time.With this in mind geologist have long known that the deeper a sedimentary rock layer is the older it is, but how old?
They will excavate a hypothetical archaeological site from their school yard, make observations, and write an interpretation of the history of the area based on the evidence they will excavate.
To facilitate the activity, the teacher will provide some introduction to absolute dating principles through the Half Life of M&M Worksheet.
Then in Phase 2 of the project, the teacher will provide the students with plastic bins each representing a different stratum of the archaeological site.
Some fossils, called index fossils, are particularly useful in correlating rocks.
For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.