Which of the following is an example of a recoverable mark?

• A. The corner of a large building.
• B. A brass plate.
• C. A tablet.
• D. A stone benchmark.

Answer: (A)

Recoverable marks are points you can re-find in the field after some time or disturbance, using a feature that remains identifiable rather than relying solely on a single physical marker. The corner of a large building is a prime example because it’s a clear, distinctive feature that stays in the same place as long as the building stands, so you can visually locate it again and re-establish measurements from it. In contrast, brass plates, tablets, and stone benchmarks are intended as permanent markers; if the marker is damaged, moved, or weathered away, re-locating precisely becomes harder, whereas a building corner remains readily recognizable and thus serves as a practical recoverable reference point.