2 Types

Relative Dating Absolute Dating

1. Law of superposition – youngest layer on top; oldest layer on bottom.

2. Disturbed Rock layers – Rock layers are horizontal, if not, there has

been a disturbance. 4 ways – Faults, Intrusion, Folding, and Tilting.

ERROR - Unconformity

Draw the flow map in your notes.

Geologist use relative dating to determine the order in which events happen.

The principle of superposition states that in undisturbed rock sequences, younger layers lie above older layers.

Folding and tilting are 2 events that disturb rock layers.

Faults and intrusions are 2 features that disturb rock layers.

The known rock and fossil record is indicated by the geologic column.

Geologist examine the relationship between rock layers and the structures that cut across them in order to determine relative age.