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-the animals soft tissues or hard parts did not decay over the years

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-classified as trace fossils as opposed to body fossils, as they give evidence for the animal's behaviour

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-a trackway made by an organism

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-the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization

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- bones deteriorate due to chemical reactions; minerals gradually enter into the cavity, resulting in a cast, also called a mold fossil, which is in the general form of the original organism

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

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Principle of original lateral continuity

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Principle of original lateral continuity

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-layers of sediment initially extend laterally in all directions

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-layers of sediment are originally deposited horizontally under the action of gravity

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-for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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-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