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27 Cards in this Set

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