Relative Age Dating Principles
And The Layer Is...
Absolute Age Dating
Geologic Time Scale
Fossils
Plate Tectonics
100
It's the principle that states that the present is key to the past.
What is uniformitarianism?
100
The youngest layer in the outcrop.
What is layer 4?
100
The time it takes for one half of a radioactive element to decay into it's nonradioactive daughter element.
What is a half-life?
100
The longest unit of the geologic time scale.
What is an eon?
100
It is a fossil that is used to correlate rock layers.
What is an index fossil?
100
A boundary that occurs where two tectonic plates slide past each other.
What is a transform boundary?
200
They are older rock fragments found in a rock layer.
What are inclusions?
200
Older than layers E and F but younger than layers D, C, and B.
What is intrusion A?
200
The number of half-lives that have passed if 25% of a radioactive parent element is left.
What is two?
200
The shortest unit of the geologic time scale.
What is an epoch?
200
A dinosaur bone is an example of this hardened fossil.
What are petrified remains?
200
A boundary that occurs where two plates are moving away from each other.
What is a divergent boundary?
300
It is the principle that states that younger rock layers are always found on top of older rock layers.
What is the principle of superposition?
300
It is a fault, and the youngest feature in the outcrop?
What is G?
300
The half-life of carbon-14.
What is 5730 years?
300
The name of the earliest era, it means "old life."
What is the Paleozoic?
300
They are fossilized feces.
What are coprolites?
300
The type of convergent boundary that occurs when one of the tectonic plates is forced under the other.
What is a subduction convergent boundary?
400
It is the principle that states that faults or intrusions are always younger than the rock layers that they cut across.
What is the principle of cross-cutting relationships?
400
It's the principle that tells you that the intrusion is the youngest feature of the outcrop.
What is the principle of cross-cutting relationships?
400
The percentage of daughter element after three half-lives.
What is 87.5%
400
The current era, it's name means "recent life."
What is the Cenozoic?
400
A prehistoric arrowhead and dinosaur footprints are examples.
What are trace fossils?
400
The type of convergent boundary that occurs when both tectonic plates are pushed upward.
What is a collision convergent boundary?
500
It states that sedimentary rocks are deposited in a horizontal or nearly horizontal layers.
What is the principle of original horizontality?
500
From oldest to youngest, it is the correct order of the features in this outcrop.
What is B, C, D, A, E, F, G?
500
The age of the Earth as determined by radiometric dating using uranium.
What is 4.6 billion years?
500
It means "middle life" and is known as the age of the dinosaurs.
What is the Mesozoic?
500
They are trace fossils of rocks that dinosaurs swallowed to aid digestion.
What are gastroliths?
500
The type of convergent boundary that occurs where an oceanic plate meets a continental plate.
What is a subduction convergent boundary?