Relative Age & Stratigraphy Vocab

Front

Scientific law: in horizontal sedimentary rock, oldest layers are at the bottom.

Back

Law of Superposition

Front

An intrusion is always ___________ than the surrounding rock layers.

Back

younger

Front

Law of Superposition conclusions about fossils?

Back

Oldest fossils in lowest rock layers.

Front

Law of Superposition: In undisturbed sedimentary rock layers, the lowest layers are the oldest.

Back

Lowest layers contain older rocks.

Front

Sedimentary rock layers are deposited flat.

Back

Law of Original Horizontality

Front

If a feature cuts across another, it is YOUNGER than the feature it cuts across.

Back

Law of Cross Cutting Relationships

Front

Magma that has forced its way into sedimentary rock layers.

Back

intrusion

Front

Break in rock at an angle where layers slide and misalign.

Back

fault

Front

Rock layers under long-term pressure can ________.

Back

bend/fold

Front

A large gap in rock layers due to erosion is called a ______________.

Back

unconformity