What characterizes pre-, syn- and posttectonic sedimentary sequences in a halfgraben setting?
What will be an ideal response?
Answer: Pretectonic sedimentation in a half-graben is not related to the graben formation. It is expected to show no thickness change across the graben-bounding fault. Syntectonic sediments show thickening towards the graben-bounding fault and rotation so that the layers dip toward the footwall. Unconformities may exist in the high part of the rotated block, while evidence of continuous sedimentation is expected in the lower part (close to the fault). Posttectonic sediments fill in the relief created by the graben without any other evidence of fault movement than that related to differential compaction across the fault.
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Indicate whether the statement is true or false
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