LiDAR 1m DTM Hillshade
Satellite Imagery
LiDAR 1m DTM Hillshade
Satellite Imagery
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HER: Gwynedd 1639 (None)
NMR: SH 57 NW 16 (302505)
SM: None
NGR: SH50457695
X: 250450 Y: 376950 (OSGB36)
Small partial contour hillfort located c. 1.5km NE of church on a small schist outcrop above Tan y Graig. In commanding position above low-lying country. Precipitous on all sides except S. Top of outcrop forms fairly flat platform about 91m by 40m, with area c. 0.36ha, with slope down its long axis S-N. Slight depressions suggest hut circles, but no wall stones. In places remains of enclosing walls on edge of the slope, no ditch. On SW, where wall best preserved, to 0.9m high, traces of inturned entrance. Trees and scrub. Site in very bad condition and affected by buildings on E. Minimal investigations, undated.
Citizen Science: ✗
Reliability of Data: Confirmed
Reliability of Interpretation: Confirmed
X: -472435 Y: 7032797 (EPSG: 3857)
Longitude: -4.24395786068891 Latitude: 53.26838690873197 (EPSG:4326)
Country: Wales
Current County or Unitary Authority: Isle of Anglesey
Historic County: Anglesey
Current Parish/Community/Council/Townland: Pentraeth
Very poor condition. Affected by farm buildings on E side.
| Extant | ✓ |
| Cropmark | ✗ |
| Likely Destroyed | ✗ |
Rough grass, trees and scrub.
| Woodland | ✓ |
| Commercial Forestry Plantation | ✗ |
| Parkland | ✗ |
| Pasture (Grazing) | ✗ |
| Arable | ✗ |
| Scrub/Bracken | ✓ |
| Bare Outcrop | ✗ |
| Heather/Moorland | ✗ |
| Heath | ✗ |
| Built-up | ✗ |
| Coastal Grassland | ✗ |
| Other | ✗ |
Possible small partial contour hillfort located c. 1m NE of church on a small schist outcrop above Tan y Graig. In commanding position above low-lying country. Precipitous on all sides except S.
| Contour Fort | ✗ |
| Partial Contour Fort | ✓ |
| Promontory Fort | ✗ |
| Hillslope Fort | ✗ |
| Level Terrain Fort | ✗ |
| Marsh Fort | ✗ |
| Multiple Enclosure Fort | ✗ |
| Hilltop | ✗ |
| Coastal Promontory | ✗ |
| Inland Promontory | ✗ |
| Valley Bottom | ✗ |
| Knoll/Hillock/Outcrop | ✓ |
| Ridge | ✗ |
| Cliff/Plateau-edge/Scarp | ✗ |
| Hillslope | ✗ |
| Lowland | ✗ |
| Spur | ✗ |
Dominant Topographic Feature: Small schist outcrop
| North | ✗ |
| Northeast | ✗ |
| East | ✗ |
| Southeast | ✗ |
| South | ✗ |
| Southwest | ✗ |
| West | ✗ |
| Northwest | ✗ |
| Level | ✓ |
Altitude: 46.0m
N/A
None
Reliability: D - None
| Pre 1200BC | ✗ |
| 1200BC - 800BC | ✗ |
| 800BC - 400BC | ✗ |
| 400BC - AD50 | ✗ |
| AD50 - AD400 | ✗ |
| AD400 - AD 800 | ✗ |
| Post AD800 | ✗ |
| Unknown | ✓ |
| Pre Hillfort: | None |
| Post Hillfort: | None |
GAT prehistoric defended enclosures survey 2004-2005.
| Other (None): | GAT prehistoric defended enclosures survey. |
Slight depressions suggest hut circles but no wall stones.
None
| None | ✓ |
| Spring | ✗ |
| Stream | ✗ |
| Pool | ✗ |
| Flush | ✗ |
| Well | ✗ |
| Other | ✗ |
Slight depressions suggest hut circles but no wall stones.
| No Known Features | ✗ |
| Round Stone Structures | ✗ |
| Rectangular Stone Structures | ✗ |
| Curvilinear Platforms | ✗ |
| Other Roundhouse Evidence | ✓ |
| Pits | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
None
| No Known Excavation | ✓ |
| Pits | ✗ |
| Postholes | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Roads/Tracks | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
| Nothing Found | ✗ |
None
| No Known Geophysics | ✓ |
| Pits | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Roads/Tracks | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
| Nothing Found | ✗ |
None
| No Known Finds | ✓ |
| Pottery | ✗ |
| Metal | ✗ |
| Metalworking | ✗ |
| Human Bones | ✗ |
| Animal Bones | ✗ |
| Lithics | ✗ |
| Environmental | ✗ |
| Other | ✗ |
None
| APs Not Checked | ✓ |
| None | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Pits | ✗ |
| Postholes | ✗ |
| Roads/Tracks | ✗ |
| Other | ✗ |
On SW, where wall best preserved, traces of inturned entrance.
| None: | Poor condition - cannot be estimated. |
| 2: | None |
Guard Chambers: ✗
Chevaux de Frise: ✗
| 1. In-turned (South west): | None |
In places remains of enclosing walls on edge of the slope. No ditch. 0.36ha.
| Area 1: | 0.36ha. |
| Total: | 0.36ha. |
Total Footprint Area: Noneha.
None
| ✗ | None |
| ✗ | No details of ramparts. |
| NE Quadrant: | None |
| SE Quadrant: | None |
| SW Quadrant: | None |
| NW Quadrant: | None |
| Total: | None |
| Partial Univallate | ✗ |
| Univallate | ✗ |
| Partial Bivallate | ✗ |
| Bivallate | ✗ |
| Partial Multivallate | ✗ |
| Multivallate | ✗ |
| Unknown | ✓ |
| Partial Univallate | ✗ |
| Univallate | ✗ |
| Partial Bivallate | ✗ |
| Bivallate | ✗ |
| Partial Multivallate | ✗ |
| Multivallate | ✗ |
Possible stone wall.
| None | ✗ |
| Earthen Bank | ✗ |
| Stone Wall | ✓ |
| Rubble | ✗ |
| Wall-walk | ✗ |
| Evidence of Timber | ✗ |
| Vitrification | ✗ |
| Other Burning | ✗ |
| Palisade | ✗ |
| Counter Scarp Bank | ✗ |
| Berm | ✗ |
| Unfinished | ✗ |
| Other | ✗ |
None
| None | ✗ |
| Earthen Bank | ✗ |
| Stone Wall | ✗ |
| Murus Duplex | ✗ |
| Timber-framed | ✗ |
| Timber-laced | ✗ |
| Vitrification | ✗ |
| Other Burning | ✗ |
| Palisade | ✗ |
| Counter Scarp Bank | ✗ |
| Berm | ✗ |
| Unfinished | ✗ |
| No Known Excavation | ✓ |
| Other | ✗ |
| ✗ | None |
| ✗ | No ditch visible. |
Number of Ditches: 0
| ✗ | None |
Lynch, F. 1991. Prehistoric Anglesey, Llangefni: Anglesey Antiquarian Society.
RCAHMW 1937 (reprinted 1960). Anglesey. A survey and inventory by the Royal Commission on Ancient and Historical Monuments in Wales and Monmouthshire, 79, B(3), London: HMSO.
Smith, G.H. 2005 , A Survey of Prehistoric Defended Enclosures in North West Wales 2004-2005: West Conwy, Gwynedd (Arfon) and Anglesey, Bangor: Gwynedd Archaeological Trust.
Waddington, K. 2013. The Settlements of Northwest Wales: From the Late Bronze Age to the Early Medieval Period, Cardiff: University of Wales Press.
Atlas of Hillforts:
Wikidata:
This work is licensed under CC BY-SA 4.0
and should be cited as:
Lock, Gary and Ralston, Ian. 2024. Atlas of Hillforts of Britain and Ireland. Available at: https://hillforts.arch.ox.ac.uk
Document Version 1.1