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Relative vs absolute dating of fossils

A few days ago, I wrote a post about the basins of the Moon -- a result of a trip down a rabbit hole of book research.

For example, the Imbrium impact basin on the Moon spread ejecta all over the place.

Unfortunately, those methods don't work on all rocks, and they don't work at all if you don't have rocks in the laboratory to age-date. They are descriptions of how one rock or event is older or younger than another.

There's no absolute age-dating method that works from orbit, and although scientists are working on age-dating instruments small enough to fly on a lander (I'm looking at you, Barbara Cohen), nothing has launched yet. Relative age dating has given us the names we use for the major and minor geologic time periods we use to split up the history of Earth and all the other planets.

Major boundaries in Earth's time scale happen when there were major extinction events that wiped certain kinds of fossils out of the fossil record.

This is called the chronostratigraphic time scale -- that is, the division of time (the "chrono-" part) according to the relative position in the rock record (that's "stratigraphy").


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  2. Absolute vs Relative Dating Page history. of elements contained in rocks and fossils. Absolute dating is based on comparing the ratio of a.

  3. Relative vs. Absolute Time in. These are the fossils that we want to use for relative dating. Index fossils help us to distinguish between rock strata from.

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  5. Absolute dating contrasts with the relative dating techniques employed. Absolute Dating Of Fossils what is difference between relative and absolute.

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