Fossils & Law of Superposition

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What is a fossil?

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A fossil is the preserved remains or traces of a once-living organism, often found in sedimentary rock.

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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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How are sedimentary rocks formed?

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Sedimentary rocks are formed by the processes of compaction and cementation of sediments.

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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 the age of another rock or fossil.

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What is absolute age?

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

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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 compaction in the context of sedimentary rock formation?

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Compaction is the process by which sediments are pressed together under pressure, reducing their volume.

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What is cementation in geology?

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Cementation is the process by which dissolved minerals crystallize and glue particles of sediment together.

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What is the significance of the youngest layer in sedimentary rock?

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The youngest layer in sedimentary rock is the most recent layer deposited, providing insights into the most current geological events.