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True Form fossils are formed when the animals soft tissues or hard parts did not decay over the years because they are trapped in sap that hardens to become amber.

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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 (in this case, diet) rather than morphology.

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A fossil trackway is a type of trace fossil, a trackway made by an organism. Many fossil trackways were made by dinosaurs, early tetrapods, and other quadrupeds and bipeds on land.

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Petrification is the process of turning living organic material into stone. This process takes place when the molecules in an organism are replaced with the molecules of a mineral. A petrified fossil is different from other fossils such as resin fossils or permineralized fossils because the original material of the organism is still intact in resin fossils or permineralized fossils.

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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.Molds and casts are three dimensional and preserve the surface contours of the organism.

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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

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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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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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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 superposition principle, also known as superposition property, states that, 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.