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The Proterozoic Era is the first and oldest division of the Phanerozoic Eon.
Q24: Which method did not contribute significant geologic
Q36: No chemical rocks can have a clastic
Q58: Fossil insects are sometimes preserved in what
Q71: What is the general name for microcrystalline
Q73: Fossilization by _ preserves the most delicate
Q101: On the basis of seismic evidence, the
Q133: On the blanks provided below, fill in
Q136: What proportion of sedimentary rocks are "limestones"?<br>A)5%<br>B)10%<br>C)20%<br>D)50%
Q140: Which one of the following best characterizes
Q204: How do water content and porosity vary