The major problem with geologic correlations is that some unconformities extend around the entire planet.

Name: The major problem with geologic correlations is that some unconformities extend around the entire planet.
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Quizplus · Accepted Answer

Unconformities represent gaps in the geologic record, but they do not necessarily extend around the entire planet. They are local or regional features resulting from erosion or lack of deposition, and their extent varies widely.

The Major Problem with Geologic Correlations Is That Some Unconformities