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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:.

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relative time
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
Absolute Time:
  • identifies the exact date of an event.
    • Ex. 65 Million Years Ago
    • 1990
finding age with relative time
Finding age with relative time:
  • The Law of Superposition - in a sequence of undisturbed sedimentary rocks, the oldest rocks will be at the bottom.
slide4

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
3. The law of included fragments - the fragments that make up a rock are older than the entire sample.
slide6
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
Other Guidelines for figuring out a sequence:
  • Sedimentary rocks are usually formed under water.
  • Weathering and erosion usually happen above water (on dry land).
slide11
Contact metamorphism shows that the rock that was changed was there first when the intrusion happened.
time for a worksheet
Time for a worksheet
  • Sequence 1 & 2
sequence 1 uplift erosion
Sequence 1: Uplift & Erosion
  • Limestone deposited
  • Sandstone deposited
  • Shale Deposited
  • Uplift
  • Erosion
sequence 2 faulting
Sequence 2: Faulting
  • Limestone deposited
  • Sandstone deposited
  • Shale deposited
  • Faulting
sequence 3 folding
Sequence 3: Folding
  • Limestone deposited
  • Sandstone deposited
  • Shale deposited
  • Folding
by the way
By the way…
  • How can you tell if folding has gone so far as to flip the layers over?
sequence 4 igneous intrusion
Sequence 4: Igneous Intrusion
  • Limestone deposited
  • Sandstone deposited
  • Shale deposited
  • Igneous Intrusion

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

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