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Geologic Time
Fossils
Relative Dating
Absolute Dating
Evolution of Life
100
The current Era of time
What is the Cenozoic
100
A type of fossil that is indicative of the Cambrian period.
What is a trilobite?
100
The principle that the oldest rocks are at the bottom, the youngest rocks are at the top of a sequence.
What is principle of superposition?
100
The time it takes for 50% of the parent isotope to decay into daughter isotopes
What is the half life?
100
The sequence of animals from fish to reptiles.
What is fish-lobe finned-lung fish-tiktaalik-amphibian-reptiles?
200
The age of the Earth
What is 4.5 billion years
200
A fossil that is created by the void left behind from the decayed animal. Opposite of a cast.
What is a mold?
200
The two principles used in the relative dating of igneous rocks.
What are the principle of inclusions and the principle of cross cutting?
200
The age of a bone that has gone through 3 C14 half lives.
What is 17 190 years?
200
Fish were the dominant animals during this period.
What is the Devonian period?
300
The greatest mass extinction occurred in this period
What is the Permian?
300
The uses of fossils
What is used to determine past environments, date rocks, correlate rocks, evidence of evolution?
300
A gap in the rock record caused by weathering and erosion.
What is an unconformity?
300
The number of half lives that have occurred if 25% of the parent isotope remains.
What is 2 half lives?
300
The dominant life of the proterozoic.
What are stromatolites?
400
The dinosaurs went extinct
What is the Cretaceous?
400
Requirements for fossilization to occur.
What is rapid burial, hard parts, large population?
400
The relative age of the igneous rock containing inclusions of a sedimentary rock.
When is the igneous rock younger then the sedimentary rock?
400
The type of rocks that can be radiometrically dated.
What is igneous rocks?
400
The major source of free oxygen.
What are plants?
500
The explosion of life occurred during this period.
What is the Cambrian?
500
Features of index fossils.
What are hard parts, large population, globally distributed, existed for a short period of time.
500
The relative age of the following rock sequence. (See Relative Dating_XSection.jpg)
What is EGLCH MDJANKBF?
500
The age of a rock containing 12.5 % U235, whose half life is 704 million years.
What is 2.1 billion years (2112 million years)?
500
The major causes of mass extinctions.
What are meteors, climate change, lowering sea levels, volcanic eruptions?