Methods of absolute fossil dating pros of dating your best friend


15-Jun-2018 15:55

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Relative-age time periods are what make up the Geologic Time Scale.The Geologic Time Scale is up there with the Periodic Table of Elements as one of those iconic, almost talismanic scientific charts.That's why geologic time is usually diagramed in tall columnar diagrams like this.Just like a stack of sedimentary rocks, time is recorded in horizontal layers, with the oldest layer on the bottom, superposed by ever-younger layers, until you get to the most recent stuff on the tippy top.Look closely at the Geologic Time Scale chart, and you might notice that the first three columns don't even go back 600 million years.

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.Here's the next step in that journey: the Geologic Time Scales of Earth and the Moon.