Cambrian seas
A) rarely encroached on the land and thus marine deposits are rare.
B) did not cover much land area due to continued orogenic activity.
C) were at an all-time low level during the whole of the period.
D) were widespread due to many low-lying land masses.
Correct Answer:
Verified
Q4: _ are the horn corals, which became
Q5: The burrow Treptichnus pedum marks the base
Q6: The hard-skeleton burrowers of the Ordovician were
A)
Q7: _ experienced a mass extinction at the
Q8: During Ordovician, the decline of stromatolites was
Q10: Early Cambrian suspension feeders included
A) anomalocarids and
Q11: The main Ordovician floating animals were the
A)
Q12: The earliest known vertebrate animals were the
A)
Q13: The largest Ordovician predator was a
A) variety
Q14: The oldest organic reefs with skeletal structures
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