Geologic Time (Chapter 8) Flashcards
1
Q
What theories are used in relative dating?
A
Uniformitarianism, original horizontality, superposition, cross-cutting, inclusions, and faunal successions.
2
Q
Name the three eons
A
Archean, Proterozoic, and Phanerozoic.
3
Q
Name the four eras
A
Precambrian, Paleozoic, Mesozoic, and Cenozoic.
4
Q
What is a nonconformity?
A
Where older metamorphic and igneous rock is cutting through layered sedimentary rock above it.
5
Q
What is an angular unconformity?
A
Where tilted sedimentary rock is below younger flat sedimentary rock.
6
Q
What is a disconformity?
A
A gap in the rock record between two formations of flat sedimentary rocks.
7
Q
What are fission tracks?
A
Marks in a rock from the decay of uranium atoms, used to date rocks
