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OSBM Bolt 
OSBM Bolt on living rock, 57' E from SE side of road, 59' NE from junction of hedge & wall at Tan-Yr-Allt opposite.
Location
Grid reference: SN 6559 9105.
Landranger 135: Aberystwyth & Machynlleth.
Structure: Rock outcrop.
Waypoint: OS0319.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Machynlleth,
13.73km to the northeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Aberystwyth to Machynlleth levelling line. The surveyor's description was OSBM Bolt on living rock, 57' E from SE side of road, 59' NE from junction of hedge & wall at Tan-Yr-Allt opposite.
Logged Visits
Logged on 29th August 2006 by superswifteagle. Condition: Couldn't find it.
Location is a small, old, quarry just S of Taliesin. No sign, no obvious place for it to be either. Very overgrown, so just may survive.
Location
Grid reference: SN 6559 9105.
Landranger 135: Aberystwyth & Machynlleth.
Structure: Rock outcrop.
Waypoint: OS0319.
Neighbouring Flush Brackets
| G2011 | Tre'r-ddôl 1.38km to the north. |
| S0460 | Tal-y-bont 1.54km to the south. |
| S0459 | Eglwys Fach 5.40km to the northeast. |
| G2010 | Rhydypennau 5.85km to the southwest. |
| 11001 | Fron-gôch 6.14km to the north. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Aberystwyth to Machynlleth levelling line. The surveyor's description was OSBM Bolt on living rock, 57' E from SE side of road, 59' NE from junction of hedge & wall at Tan-Yr-Allt opposite.
Logged Visits
Logged on 29th August 2006 by superswifteagle. Condition: Couldn't find it.
Location is a small, old, quarry just S of Taliesin. No sign, no obvious place for it to be either. Very overgrown, so just may survive.
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