States that layers of sediments are generally deposited in a horizontal position.

A method used to determine the numerical age of rocks and fossils.

A type of fossil where the organic material is replaced by minerals, creating a replica.

The age of Earth is determined through these two dating methods.

The division of geologic time that marks the "Age of Mammals."

The process where an organism is buried under fine sediment, leaving a carbon film.

A type of unconformity where younger sedimentary rocks rest upon tilted older rocks.

A technique that determines the age of a fossil by measuring carbon isotopes.

The division of time marked by the dominance of dinosaurs.

The type of rock that preserves fossils most effectively.

States that the present is the key to understanding the past.

The smallest unit of geologic time.

A type of unconformity found between sedimentary rocks and eroded igneous rocks.

What does the term "lithification" refer to?

What is the oldest eon in the geologic time scale?

A principle that states rock fragments within another rock must be older.

Which process occurs when a nucleus absorbs an inner electron?

The eon when multicellular organisms became abundant.

A long period where deposition stopped and erosion removed previously formed rocks.

The scientist who introduced the Principle of Fossil Succession.

A process where tree resin traps and preserves organisms.

The dating method using radioactive isotopes to determine exact rock age.

The period associated with the first significant evolution of fishes.

The layer of rock that captures evidence of ancient life over time.