Fossils
Remains or impression of an organism preserved in petrified rock
What is a fossil?
The system of time measuremet involving the formation of and changes to Earth.
What is the Geologic Time Scale?
Determination of th age of a rock based on th surrounding evidence
What is relative dating?
A fossil that is evidence of an organism's activity; such as a footprint.
What is a trace fossil?
The Age of Dinosaurs
What is the Mesozoic Era?
States that younger rock are above older rock.
What is the Law of Superposition?
A fossil that forms, leaving a cavity behind.
What is a mold fossil?
The era that we're currently in
What is the Cenozoic Era?
Method of determining the age based on measuring radioacitve elements
What is radioactive/absolute dating?
A common fossil found in many different areas from a specific time, used to help identify the age of other formations.
What is an index fossil?
When magma cool inside the Earth's crust and are younger than the rock layers it disturbs.
What is a magma intrusion?
Leaves a gap in the geologic record due to erosion
What is an unconformity?