Black Thumb () is a mountain, high, with notched and precipitous sides, standing between Romulus Glacier and Bertrand Ice Piedmont on the west coast of Graham Land. It was charted and named by the British Graham Land Expedition under John Rymill, 1934–37. Further reading United States. Defense Mapping Agency. Hydrographic Center, Sailing Directions for Antarctica: Includes Islands South of Latitude 60°, P 203 External links Black Thumb on USGS website Black Thumb on AADC website Black Thumb on SCAR website Black Thumb current weather Black Thumb long term updated weather forecast Black Thumb historic weather data References Mountains of Graham Land Fallières Coast