Discussion
On an eroded map surface, an anticline is recognised by beds that become
Answer: C
Correct answer: older toward the fold axis
Once erosion has planed off the crest, the age relationship rather than the topography identifies the fold. The oldest beds, originally deepest, are brought highest at the crest of the arch and so appear along the axis, with successively younger beds outcropping outward on both sides. A syncline shows the reverse. This is why a mapped anticline may occupy a valley and a syncline a ridge - the structure is read from the stratigraphy, not the landform.
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