Two Layers of Rock Contain Trilobites That Have the Same

question 55

Multiple Choice

Two layers of rock contain trilobites that have the same body morphology;however,one rock layer is a shale and the other is an ironstone.Can these two layers be used for correlation?

• A)No,layers with the same lithology can only be used for correlation purposes.
• B)No,the ironstone has been altered by oxidation and thus is older than the shale.
• C)Yes,if the trilobites are the same,then the layers were formed at the same time.
• D)Yes,the ironstone is the altered remains of the shale and thus the layers are the same.

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