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OSBM Bolt 
OSBM Bolt on concrete block at angle of hedge, N side of crossroads.
Location
Grid reference: ST 2090 8272.
Landranger 171: Cardiff & Newport, Pontypool.
Structure: Concrete block.
Waypoint: OS0787.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Penhow,
23.27km to the east.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Penhow to Cowbridge levelling line. The surveyor's description was OSBM Bolt on concrete block at angle of hedge, N side of crossroads.
Location
Grid reference: ST 2090 8272.
Landranger 171: Cardiff & Newport, Pontypool.
Structure: Concrete block.
Waypoint: OS0787.
Neighbouring Flush Brackets
| G3991 | Llanedeyrn Bridge 1.62km to the east. |
| G3992 | Lisvane, Crossways 1.72km to the west. |
| S1317 | St. Mellons, Church 2.36km to the southeast. |
| S1316 | St. Mellons, Bethania Chapel 2.58km to the southeast. |
| G3990 | St Mellons 2.70km to the east. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Penhow to Cowbridge levelling line. The surveyor's description was OSBM Bolt on concrete block at angle of hedge, N side of crossroads.
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