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True form fossils are when the actual plant or animal IS the fossil; that is, the whole organism has been preserved. The soft tissues of the organism never decay.

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A coprolite is fossilized feces. Coprolites are classified as trace fossils as opposed to body fossils, as they give evidence for the animal's behaviour

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A fossil trackway is a type of trace fossil, a trackway made by an organism. ... Marine organisms also made many ancient trackways

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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

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Organisms buried in sediment may decay or dissolve away leaving a cavity or mold. If the space is subsequently filled with sediment, an external cast can be made

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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

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The principle of cross-cutting relationships states that an igneous intrusion is always younger than the rock it cuts across.

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

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the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest. 2. n.

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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.