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The fossil record shows a sequence of variations based on what?
Q2: What is the currently favored hypothesis for
Q10: What characteristic feature of Pennsylvanian rocks distinguishes
Q15: The fine,clay- and silt-sized particles that result
Q35: Where does groundwater discharge naturally?<br>A) only in
Q36: The adaptive radiation that led to evolution
Q40: The first major transgression onto the North
Q70: Rocks associated with the Wopmay orogen document
Q74: Describe how the first geologic map was
Q79: Ammonites were one of three major groups
Q92: Pegmatites are associated with _ rocks and