Proterozoic "elephant skin" bedding surfaces indicates
A) ripples in sediment of the sea floor.
B) shrinkage of thread-like cyanobacterial mats.
C) burrows kept open for communication with oxygen-rich water.
D) horizontal burrows produced by some of the oldest known burrowing organisms.
Correct Answer:
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Q9: Cratons of modern proportions first began to
Q10: Animals probably originated during
A) Paleoproterozoic.
B) Mesoproterozoic.
C) Neoproterozoic.
D)
Q11: Until at least halfway through Paleoproterozoic (about
Q12: The transition from shelf deposition to deepening
Q13: The Wopmay orogeny, involving the Slave craton
Q15: The bilaterally symmetrical soft-bodied Ediacaran fossil Kimberella
Q16: In the Wopmay orogenic sequence of sediments,
Q17: It is likely that the intracellular body
Q18: The main exposed part of the North
Q19: The key evolutionary step that allowed one
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