Discussion
A bed parallel elongation giving rise to tectonic thinning is characteristic of :
Answer: A
Bed-parallel elongation causing tectonic thinning is characteristic of an extensional fault.
Structural geology distinguishes faults by two references. 'Normal' and 'reverse' describe movement relative to the horizontal. 'Extensional' and 'contractional' describe the effect on the layering: an extensional fault lengthens the layers it cuts and thins the sequence, whatever its dip. So a fault that produces elongation parallel to bedding and tectonic thinning is, by definition, extensional.
A normal fault usually is extensional too, but not necessarily if the beds are steeply tilted. A thrust fault shortens and thickens the sequence, and 'buckle fault' is not a standard fault type.
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