Law of Superposition

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What is the Law of Superposition?

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The Law of Superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

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What is a fossil?

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A fossil is the preserved remains or traces of ancient organisms, often found in sedimentary rock.

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What is relative age?

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Relative age is the age of a rock or fossil in comparison to other rocks or fossils, determining which is older or younger.

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What is absolute age?

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Absolute age is the actual age of a rock or fossil, usually determined by radiometric dating.

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What is an index fossil?

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An index fossil is a fossil that is used to define and identify a particular time period in the geological time scale.

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What is a rock layer?

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A rock layer is a single layer of rock that has distinct characteristics and is part of a larger sequence of layers.

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What is an intrusion in geology?

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An intrusion is a body of igneous rock that has formed from magma that has cooled and solidified beneath the Earth's surface.

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What is a fault?

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A fault is a fracture or zone of fractures between two blocks of rock, which can cause earthquakes.

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What is an unconformity?

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An unconformity is a surface that represents a gap in the geological record, where rock layers have been eroded or not deposited for a period of time.

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What is the significance of trilobites in geology?

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Trilobites are significant as index fossils, helping to date the rock layers in which they are found.