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OSBM Bolt 
OSBM Bolt on top of bridge abutment, NE side of road.
Location
Grid reference: SS 6944 9296.
Landranger 170: Vale of Glamorgan, Rhondda & Porthcawl.
Structure: Unknown.
Waypoint: OS0766.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Bishopston,
12.55km to the west.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Cowbridge to Bishopston levelling line. The surveyor's description was OSBM Bolt on top of bridge abutment, NE side of road.
Location
Grid reference: SS 6944 9296.
Landranger 170: Vale of Glamorgan, Rhondda & Porthcawl.
Structure: Unknown.
Waypoint: OS0766.
Neighbouring Flush Brackets
| G3812 | Swansea, Vale of Neath PH 1.42km to the west. |
| G3811 | Crymlyn Burrows 2.01km to the east. |
| G3813 | Swansea, Fabian Street 3.21km to the west. |
| G3814 | Swansea, St Thomas 3.39km to the west. |
| G3810 | By Briton Ferry 3.77km 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 Cowbridge to Bishopston levelling line. The surveyor's description was OSBM Bolt on top of bridge abutment, NE side of road.
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