Post Rock is a small promontory 40 m high, forming the west side of the entrance to Elsehul, near the west end of South Georgia. The name appears to be first used on a 1931 British Admiralty chart.
This article incorporates public domain material from the United States Geological Survey document "Post Rock (South Georgia)" (content from the Geographic Names Information System).
References
Post Rock (South Georgia) Wikipedia(Text) CC BY-SA