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 well, retaining clearly
the original form and construction of its mound and its chamber. Its good
survival is reflected in this monument being quoted as an exemplar of the
boat-shaped chamber plan in the recent study of this monument class. 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.
Details
The monument includes a prehistoric entrance grave situated near the centre 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, 14m in
diameter and 1.6m high. The mound rises to a kerb of at least nine slabs
defining an ovoid central platform measuring 8.3m east-west by 8m north-south.
Almost bisecting the platform is a funerary chamber with its long axis
orientated east-west, the entrance facing east. The chamber interior measures
7m east-west by up to 1.5m wide across the middle, with a boat-shaped plan,
the sides curving in slightly to 1m wide at the western end and 0.65m wide at
the entrance, which is constricted by a kerb slab to each side. The chamber is
lined by side-slabs and a terminal slab across the western end, while four
slabs, called capstones, up to 2m long and 1.4m wide, span the chamber's roof.
Gaps between some of these capstones result from relatively recent
stone-robbing. The chamber of this entrance grave has been described as
"perhaps the best and ideal example of a coffin or boat-shaped chamber" in a
recent authoritative study of Scilly's entrance graves.
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.
