Question

The given map shows the outcrop patterns of beds (1 – 4) across a fault plane, F – F’, on a flat ground. X and Y refer to the two blocks across F – F’. Which one of the following options is the correct interpretation of the structure depicted on the map?

• A. A south-easterly plunging synform that was subsequently faulted with block X upthrown
• B. A north-westerly plunging antiform that was subsequently faulted with block Y upthrown
• C. A south-easterly plunging antiform that was subsequently faulted with block X downthrown
• D. A north-westerly plunging synform that was subsequently faulted with block Y downthrown

Answer 1

The Correct Option is A

The given map shows beds 1 to 4, with the youngest bed being at the top and the oldest at the bottom. The pattern of the beds suggests a south-easterly plunging synform. After the formation of the synform, a faulting event occurred, where block X was displaced upward (upthrown). This interpretation corresponds to option (A), where a south-easterly plunging synform was faulted with block X upthrown