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Relative Dating - Example 1
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. For example, the Imbrium impact basin on the Moon spread ejecta all over the place. Tanaka and Hartmann suggest that the decline in mare volcanism -- and whatever impact crater density is associated with the last gasps of mare volcanism -- would be a better marker than any one impact crater. Layers that cut across other layers are younger than the layers they cut through principle of cross-cutting relationships. We can all agree to the extent that scientists agree on anything to the fossil-derived scale, but its correspondence to numbers is a "calibration" process, and we must either make new discoveries to improve that calibration, or estimate as best we can based on the data we have already. Due to that discovery, Smith was able to recognize the order that the rocks were formed. Index fossils occur for a limited interval of time. For example, if a valley is formed inside an impact crater , the valley must be younger than the crater. For example, the element carbon has six protons, but can have six, seven, or eight neutrons. The study of melt inclusions has been driven more recently by the development of sophisticated chemical analysis techniques. 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. Chapter Contents: The Geologic Time Scale is not light reading, but I think that every Earth or space scientist should have a copy in his or her library -- and make that the latest edition. Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top.
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