Lecture 7 - Week 4 - Time Sequence Flashcards
What is stratigraphy?
The study of stratified rocks (rock layers)
What is lithostratigraphy?
Landforms based on their place and grouping in the lithosphere.
What is a “bed”?
A lithologically distinct layer
What is a “member”?
A distinct part of a formation
What is a “formation”?
A primary unit of a sequence; the name should be capitalized
What is a “group”?
Two or more formations
What is a “supergroup”?
Two or more groups
The principals of stratigraphy allow us…
to figure out how different packages of rocks relate or are associated with one another.
Oldest layers at the bottom is the…
Principle of Superposition
Sedimentary layers started out flat…
Principle of Original Horizontality
Deposited in a continuous layer…
Principle of Original Lateral Continuity
Uranium dating is good for anything __ _______ years or older, and can be used to date volcanic ash, zircon crystals, meteorites etc.
10 million years. “Uranium dating is good for anything 10 million years or older, can be used to date volcanic ash, zircon crystals, meteorites etc.”
Carbon 14 dating is only useful up to ______ years old.
60,000
This can be used to sample the actual fossil being dated (e.g. bone, wood, etc.)
A. Uranium
B. Carbon 14
Carbon 14
How does Cosmogenic Dating work?
Measures cosmogenic isotopes caused by cosmic bombardment of rocks exposed at the surface to see how long they have been there.
