During Late Cambrian and Early Ordovician, eastern North America (Laurentia) was a
A) tectonically active region, which had a subduction zone.
B) passive continental margin with vast carbonate shelves.
C) site of vast continental rifting and volcanism.
D) tectonically active region, which had extensive volcanic activity.
Correct Answer:
Verified
Q18: The conodontomorphs first appeared during
A) Early Ordovician.
B)
Q19: The trilobites first appear during
A) Early Ordovician.
B)
Q20: The organism that left tracks on sediment
Q21: The shift toward heavier oxygen and carbon
Q22: The second phase of the great Ordovician
Q24: During the great mass extinction of Late
Q25: That the concentric layers within Ordovician ooids
Q26: The movement of _ toward the south
Q27: The Taconic orogeny was the result of
Q28: The development of a Late Ordovician ice
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