The First of the Two Cooling Episodes During Late Devonian

question 2

Multiple Choice

The first of the two cooling episodes during Late Devonian, both of which have been identified using carbon and oxygen isotope studies, are associated with mass extinctions, the first of which is found at the

• A) top of the Frasnian Stage.
• B) base of the Frasnian Stage.
• C) top of the Famennian Stage.
• D) base of the Famennian Stage.

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