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Objective: You will be able to construct a geologic history of a region by observing rock layers in different localities.
To determine absolute age we need to see match similar rock layers in different locations to see if they were formed at the same time or under similar conditions.
Ways to correlate
- Compare the properties of the rock such as color, texture, or composition.
- Compare index fossils contained in the layers with the Geologic Time Scale to determine the age of the layers.
Activity 1
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Draw lines representing equivalent boundaries between rock layers from one column to the next.
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Reconstruct the complete column in the blank column.
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Draw in thick lines on each column identifying the location of unconformities.
Activity 2
The set of diagram below identifies four types of index fossils and shows four columns of fossil bearing rock strata.
- Reconstruct the complete sequence of events and draw the layers (with the fossils if present) on a columm.
- Label the age and period/epoch of the layers containing fossils.
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