Deep Time: How Old Is Old?

A set of flashcards summarizing key concepts related to geological time and formations from the lecture notes.

Angular Unconformity

Separates inclined (tilted or folded) layers below the erosional surface from horizontal layers above it.

Geologic Map

A regional color map showing the spatial distribution of rock units and structures at Earth's surface.

Geologic Column

A composite stratigraphic chart showing Earth's entire history.

Eon

The largest subdivision of geologic time.

Hadean Eon

The inferno Earth, one of the subdivisions of geologic time.

Archean Eon

An Eon characterized by the formation of the oldest known rocks and the development of early life.

Proterozoic Eon

The Eon that lasted for a significant period and witnessed the emergence of more complex life forms, including protists and fungi.

Phanerozoic Eon

An Eon known as the age of visible life, encompassing a significant development of diverse life forms.