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27 Cards in this Set
- Front
- Back
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Absolute age
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Is a property of geological objects that consist of the actual age of an object.
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Angular conformity
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is a boundary that is between horizontal and tilted layers of rock.
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Bedding plane
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is a boundary that is between two sedimentary rock layers.
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A coprolite
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is fossilized waste material that is from an animal.
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Evolution
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is the change of living things that occurs over a period of time.
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Gastrolith
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is a fossilized stone that is found within the digestive system of a dinosaur or other reptile.
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Half-life
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is the time required for half the mass of a radioactive element to decay into its daughter.
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An Index Fossil
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is also known as a guide fossil found in rock layers of only one geologic age that is used to establish the relative age of the rock layers.
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The law of crosscutting relationships
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is a principle that a fault or intrusion is always younger than the rock layers it cuts through.
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Nonconformity
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is unconformity that which stratified rock rests on unstratified rock.
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Paleontology
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is the study of fossils.
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Petrification
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is a process in which organic materials are replaced by minerals.
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Relative age
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is age of an object that is compared with the ages of other objects.
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Trace fossil
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is a fossil trace that is left by an ancient organism such as a track, footprint, boring, or borrow.
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Unconformity
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is a break in the geologic record that is created when rock layers are removed by erosion.
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Cenozoic Era
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is the most recent geologic era that began 65 million years ago. (Age of the Mammals)
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Epoch
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is a subdivision of geologic period.
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Era
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is the largest unit of geologic time.
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Geologic Column
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is an arrangement of rock layers that is based on the ages of the rocks.
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Invertebrate
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is an animal that has no backbone.
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Mesozoic Era
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is a geologic era that lasted 245 million to 65 million years ago; the age of the reptile.
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Amber
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is a hardened tree sap that fossils may be preserved.
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Disconformity
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is a boundary between layers of rock that has not been deposited continuously.
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Mummification
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is a preservation of a dead organism that dries.
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Paleontologist
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is a scientist that studies fossils.
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The principle of uniformitarianism
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is a theory that geologic processes at work in the present were also at work in the past.
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Varve
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is an annual layer of sedimentary deposit that is on a lake bed.
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