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# Relative Time: - PowerPoint PPT Presentation

Relative Time:. Ages of events are placed in order of occurrence. No exact date is identified. Ex. WWI and WWII I am the second child in my family. Absolute Time:. identifies the exact date of an event. Ex. 65 Million Years Ago 1990. Finding age with relative time:.

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Relative Time:
• Ages of events are placed in order of occurrence.
• No exact date is identified.
• Ex. WWI and WWII
• I am the second child in my family.
Absolute Time:
• identifies the exact date of an event.
• Ex. 65 Million Years Ago
• 1990
Finding age with relative time:
• The Law of Superposition - in a sequence of undisturbed sedimentary rocks, the oldest rocks will be at the bottom.

2. The law of cross-cutting relationships – anything that cuts across layers of rock is younger than the rocks that it has intruded into. This applies to faults and igneous intrusions.

3. The law of included fragments - the fragments that make up a rock are older than the entire sample.
The Law of Folds or Tilts: tilts in rocks are younger than the rocks themselves.
• Original Horizontality- Rocks are usually deposited flat and level.
• Cole’s Law-

Thinly sliced cabbage.

Other Guidelines for figuring out a sequence:
• Sedimentary rocks are usually formed under water.
• Weathering and erosion usually happen above water (on dry land).
Contact metamorphism shows that the rock that was changed was there first when the intrusion happened.
Time for a worksheet
• Sequence 1 & 2
Sequence 1: Uplift & Erosion
• Limestone deposited
• Sandstone deposited
• Shale Deposited
• Uplift
• Erosion
Sequence 2: Faulting
• Limestone deposited
• Sandstone deposited
• Shale deposited
• Faulting
Sequence 3: Folding
• Limestone deposited
• Sandstone deposited
• Shale deposited
• Folding
By the way…
• How can you tell if folding has gone so far as to flip the layers over?
Sequence 4: Igneous Intrusion
• Limestone deposited
• Sandstone deposited
• Shale deposited
• Igneous Intrusion

Note: contact metamorphism is the same event as the intrusion.