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Geologists call this simple observation the Principle of Superposition, and it is most important way of working out the order of rocks in time.Ordering of rocks (and the fossils that they contain) in time from oldest to youngest is called .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.Here's the next step in that journey: the Geologic Time Scales of Earth and the Moon.The Geologic Time Scale is up there with the Periodic Table of Elements as one of those iconic, almost talismanic scientific charts.Long before I understood what any of it meant, I'd daydream in science class, staring at this chart, sounding out the names, wondering what those black-and-white bars meant, wondering what the colors meant, wondering why the divisions were so uneven, knowing it represented some kind of deep, meaningful, systematic organization of scientific knowledge, and hoping I'd have it all figured out one day. Sedimentary rocks form from soil and silt carried and deposited by moving water.
I thought it would be useful to present an example where the geology is simple, and unsurprisingly, the method does work well, to show the quality of data that would have to be invalidated before a major revision of the geologic time scale could be accepted by conventional scientists.Igneous rocks form from eruptions of lava or magma.Metamorphic rock is formed by great pressure far below the Earth's surface.his document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale.
It is not about the theory behind radiometric dating methods, it is about their , and it therefore assumes the reader has some familiarity with the technique already (refer to "Other Sources" for more information).The geological time scale is used by geologists and paleontologists to measure the history of the Earth and life.