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a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.

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Fossils forms in this layer.

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A bug stuck in amber

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Paleontologist believe it is 4.6 Billion Years Old

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History of rock and fossils.

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It ells us that the deeper we dig - the older the rock gets.

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Is a impression left by the original organism

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

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Petrification is the process of turning living organic material into stone.

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Molds and casts are three-dimensional impressions in which the surface contours of an organism are preserved.

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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 theory that all geologic phenomena may be explained as the result of existing forces having operated uniformly from the origin of the earth to the present time.