ASBOG Practice Exam 2025 – Comprehensive All-in-One Guide to Ace Your Geology Licensure!

Question: 1 / 400

Where is the fold axis line located?

At the crest of the fold

At the zone of maximum dip

At the zone of zero dip or dip rollover

The fold axis line is defined as the line that runs through the points of zero dip along the surface of a fold, which is commonly referred to as the hinge line. This line represents the crest of the fold, where the angle of inclination of the layered rock is at its least steep—effectively where the dip transitions from ascending to descending. This is significant because it represents the transition point between the two limbs of the fold, and it is at this zone that the change in dip direction occurs, demonstrating the nature of the folding process.

Understanding the placement of the fold axis is essential in structural geology and helps geologists interpret geological maps and models of deformed strata. The concepts of folds are fundamental when analyzing the tectonic history of an area, as they provide insight into the stress and strain experienced by the Earth's crust.

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At the base of the fold

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