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Relative dating does not provide actual numerical dates for the rocks.
Fossils are important for working out the relative ages of sedimentary rocks.
| Teaching Weathering, Erosion, & Deposition | | Teaching the Metric System | Teaching the Water Cycle | Teaching Plate Tectonics | Teaching Earthquakes | Teaching Volcanoes | | Teaching Experimental Design | Contains over 200 pages of ready-to-run materials covering: Relative and Absolute Time, Sequencing Geologic Events, Geologic History Timelines, Geologic Eras, Fossils, Tree Cookies, and Radiactive Dating.
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.The lines represent magnetic field lines, blue when the field points towards the center and yellow when away.