Entrance grave 47m north west of Old Rock, Porth Hellick Down, St Mary's


Heritage Category: Scheduled Monument

List Entry Number: 1011945

Date first listed: 07-Oct-1976

Date of most recent amendment: 17-May-1995


Ordnance survey map of Entrance grave 47m north west of Old Rock, Porth Hellick Down, St Mary's
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The building or site itself may lie within the boundary of more than one authority.

District: Isles of Scilly (Unitary Authority)

Parish: St. Mary's

National Grid Reference: SV 92892 10647


Legacy Record - This information may be included in the List Entry Details.

Reasons for Designation

The Isles of Scilly, the westernmost of the granite masses of south west England, contain a remarkable abundance and variety of archaeological remains from over 4000 years of human activity. The remote physical setting of the islands, over 40km beyond the mainland in the approaches to the English Channel, has lent a distinctive character to those remains, producing many unusual features important for our broader understanding of the social development of early communities. Throughout the human occupation there has been a gradual submergence of the islands' land area, providing a stimulus to change in the environment and its exploitation. This process has produced evidence for responses to such change against an independent time-scale, promoting integrated studies of archaeological, environmental and linguistic aspects of the islands' settlement. The islands' archaeological remains demonstrate clearly the gradually expanding size and range of contacts of their communities. By the post- medieval period (from AD 1540), the islands occupied a nationally strategic location, resulting in an important concentration of defensive works reflecting the development of fortification methods and technology from the mid 16th to the 20th centuries. An important and unusual range of post- medieval monuments also reflects the islands' position as a formidable hazard for the nation's shipping in the western approaches. The exceptional preservation of the archaeological remains on the islands has long been recognised, producing an unusually full and detailed body of documentation, including several recent surveys. Entrance graves are funerary and ritual monuments whose construction and use dates to the later Neolithic, Early and Middle Bronze Age (c.2500-1000 BC). They were constructed with a roughly circular mound of heaped rubble and earth, up to 25m in diameter, whose perimeter may be defined by a kerb of edge-set slabs or, occasionally, coursed stone. The mound contains a rectangular chamber built of edge-set slabs or coursed rubble walling, or a combination of both. The chamber was roofed by further slabs, called capstones, set across the chamber. The chamber was accessible via a gap in the mound's kerb or outer edge and often extends back beyond the centre of the mound. The cairn's mound and chamber may incorporate natural boulders and outcrops. Excavations in entrance graves have revealed cremated human bone and funerary urns, usually within the chambers but on occasion within the mound. Unburnt human bone has also been recovered but is only rarely preserved. Some chambers have also produced ritual deposits of domestic midden debris, including dark earth typical of the surface soil found within settlements, animal bone and artefact fragments. Entrance graves may occur as single monuments or in small or large groups, often being associated with other cairn types in cemeteries. They may also occur in close proximity to broadly contemporary field boundaries. The national distribution of entrance graves is heavily weighted towards the Isles of Scilly which contain 79 of the 93 surviving examples recorded nationally, the remaining 14 being located in western Cornwall.

This entrance grave on Porth Hellick Down has survived substantially intact. Despite some stone-robbing from the funerary chamber, the monument retains clear evidence for the original form and construction of its mound and chamber. The presence of this monument within a cemetery containing various cairn types, its proximity to a prehistoric field system on the western slope of the Down, and the disposition of this and the other cairn cemeteries on successive downs along the coast are all factors combining to illustrate well the diversity of funerary practices and the organisation of land use during the Bronze Age.


Legacy Record - This information may be included in the List Entry Details.


The monument includes a prehistoric entrance grave situated towards the south east edge of Porth Hellick Down, on south eastern St Mary's in the Isles of Scilly.

The entrance grave survives with a circular mound of heaped rubble, 13m in diameter and 1m high. The mound rises to a kerb of spaced slabs, mostly edge-set and up to 1.1m long and 0.55m high, with some lower slabs covered by a thin turf. The kerb defines the perimeter of a flattened platform, 7m in diameter, which is almost bisected by a funerary chamber with a north-south long axis, the entrance facing north.

The southern end of the chamber is lined by large edge-set slabs on the west side and across the southern end, and by a boulder on the east side. Another large slab, called a capstone, measuring 1.8m long by 1.4m wide and 0.3m thick, lies flat across the chamber, resting on the side-slabs. This intact chamber stonework protrudes 0.7m from the top of the mound to the top of the capstone and defines the interior of the chamber's southern end, measuring 2m north-south by 1.2m wide and 0.7m high. The chamber occupies almost the full width of the platform, its southern terminal slab located close to the largest slab in the platform's kerb. North of the slab-lined southern end, the unroofed sides of the chamber extend a further 4m, almost to the northern edge of the cairn's platform and visible as a turf-covered hollow, up to 1.2m wide, giving an overall length of 6m for the chamber. The capstones and most side-slabs of this northern sector of the chamber have been removed during an unrecorded stone-robbing episode.

This monument forms part of a cairn cemetery containing at least eight other cairns dispersed across the central plateau of Porth Hellick Down. The cairns in this cemetery vary in form but at least six of these are entrance graves, forming one of the largest surviving groupings of this type of monument. A broadly contemporary field system extends along the north west slope of the Down. Other prehistoric cairn cemeteries, including entrance graves, are located on the adjacent coastal downs of Salakee Down to the south west and Normandy Down to the NNE.

MAP EXTRACT The site of the monument is shown on the attached map extract. It includes a 2 metre boundary around the archaeological features, considered to be essential for the monument's support and preservation.


The contents of this record have been generated from a legacy data system.

Legacy System number: 15362

Legacy System: RSM


Books and journals
Ashbee, P, Ancient Scilly, (1974)
Ashbee, P, The chambered Tombs on St Mary's, Isles of Scilly, (1963), 9-18
Russell, V, Isles of Scilly Survey, (1980)
consulted 1994, Waters, A., AM 107 for Scilly SMR entry PRN 7527, (1988)
consulted 1994, Waters, A., AM 107 for Scilly SMR entry PRN 7528, (1988)
consulted 1994, Waters, A., AM 107 for Scilly SMR entry PRN 7528.07, (1988)
Rees, S., AM7 scheduling documentation for CO 1026, 1975, consulted 1994
Title: 1:2500 Ordnance Survey Map; SV 9210 Source Date: 1980 Author: Publisher: Surveyor:

End of official listing