The shift toward heavier oxygen and carbon isotopes at the base of the Hirnantian Substage at the top of the Ashgill Stage indicates that
A) Gondwanaland arrived at the south pole.
B) Gondwanaland arrived at the north pole.
C) glaciers spread across Gondwanaland.
D) glaciers melted from Gondwanaland.
Correct Answer:
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Q16: Pikaia was a swimming chordate whose fossils
Q17: What was the position and orientation of
Q18: The conodontomorphs first appeared during
A) Early Ordovician.
B)
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A) Early Ordovician.
B)
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Q26: The movement of _ toward the south
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