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Geology[ edit ] The regular order of the occurrence of fossils in rock layers was discovered around by William Smith. However, the layer of that material will become thinner as the amount of material lessens away from the source. Law of Superposition Once we assume that all rock layers were originally horizontal, we can make another assumption:
Scientists from the former Soviet Union lead the study of melt inclusions in the decades after World War II Sobolev and Kostyuk, , and developed methods for heating melt inclusions under a microscope, so changes could be directly observed. Now imagine that you come upon a formation like this: This feature is produced by changes in deposition over time.
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