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Uniformitarianism is defined in the authoritative Glossary of Geology as "the fundamental principle or doctrine that geologic processes and natural laws now operating to modify the Earth's crust have acted in the same regular manner and with essentially the same intensity throughout geologic time, and that past.

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the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest.

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The Principle of Original Horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.

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Principle of original lateral continuity

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Principle of original lateral continuity

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The principle of lateral continuity states that layers of sediment initially extend laterally in all directions; in other words, they are laterally continuous.

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Cross-cutting relationships is a principle of geology that states that the geologic feature which cutsanother is the younger of the two features.

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This is a restatement of Charles Lyell's original principle of inclusions and components from his 1830 to 1833 multi-volume Principles of Geology, which states that, with sedimentary rocks, if inclusions or clasts are found in a formation, then the inclusions must be older than the formation that contains them.

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Organisms buried in sediment may decay or dissolve away leaving a cavity or mold.

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In geology, petrifaction or petrification is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals.

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A fossil trackway is a type of trace fossil, a trackway made by an organism.

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Coprolites are classified as trace fossils as opposed to body fossils, as they give evidence for the animal's behaviour in this case, diet rather than morphology

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A true form fossil is a fossil of the whole entire body of the organism like an actual animal or animal part.