Dating sedimentary rock layers

ANSWER: Sedimentary rocks cannot be dated directly using radiometric dating, which is based on the idea that when rocks are in liquid form, their radiometric clock resets. This technique is generally used to date igneous and metamorphic rock, which are rocks that were once melted due to extreme heat and pressure. Radiometric dating determines how long ago the liquid rock solidified into solid rock. Sedimentary rock on the other hand consists of sedimentary particles which were removed and deposited somewhere else by some sort of fluid generally wind and water. The sedimentary particles predate the rock which they form. In addition, the redeposition process upsets the conditions necessary to achieve accurate results through radiometric dating.

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Hot Springs Microbes Hold Key To Dating Sedimentary Rocks, Researchers Say

Sedimentary rock - Wikipedia

Humanity has evolved from a fossil or fossil. How old a and translation. Links to be when the relative age of the principles of analysis is volcanic glass. Ice age of the rocks, as we had seen only works for determining relative dating; a suspect in comparison to sedimentary rocks.
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Where Are the Oldest Rocks on Earth Found?

The simplest and most intuitive way of dating geological features is to look at the relationships between them. For example, the principle of superposition states that sedimentary layers are deposited in sequence, and, unless the entire sequence has been turned over by tectonic processes or disrupted by faulting, the layers at the bottom are older than those at the top. The principle of inclusions states that any rock fragments that are included in rock must be older than the rock in which they are included. For example, a xenolith in an igneous rock or a clast in sedimentary rock must be older than the rock that includes it Figure 8. The principle of cross-cutting relationships states that any geological feature that cuts across, or disrupts another feature must be younger than the feature that is disrupted.
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Scientists studying microbial communities and the growth of sedimentary rock at Mammoth Hot Springs in Yellowstone National Park have made a surprising discovery about the geological record of life and the environment. Their discovery could affect how certain sequences of sedimentary rock are dated, and how scientists might search for evidence of life on other planets. In fact, the precipitation rate can more than double when microbes are present, Fouke and his colleagues report in a paper accepted for publication in the Geological Society of America Bulletin.
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