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Cover of British Archaeology

Issue 70

May 2003

Great sites: Silbury Hill

Archaeologists have been intrigued by Europe's largest prehistoric mound
for centuries. David Field reports on new work that overturns some old ideas

Great sites rarely come much greater than Silbury Hill - at least in
terms of scale. This giant Neolithic tumulus near Avebury, the largest
man-made prehistoric mound in Europe, has been a source of observation,
speculation and wishful thinking for hundreds if not thousands of years.

Antiquaries and archaeologists have been visiting the site since at
least the 17th century, and since then Silbury Hill has been interpreted
variously as the burial place of an Ancient-British or Roman king, a
platform for druid sacrifice, an astronomical observatory, a part of the
Avebury temple, a temple to Mercury, a mound for assemblies and law
making and a medieval motte.

Oddly enough, the first excavators of the mound, the Duke of
Northumberland and Colonel Drax, were closer to the mark in 1776 when,
announcing their intention of sinking a shaft 8ft square from the summit
to the old ground surface in search of the contents, they issued what
amounts to a press release. This clearly indicated that they believed
the mound to be some 3,000-4,000 years old - with hindsight a not
unreasonable estimate.

Again and again excavators returned, hoping to solve Silbury's mysteries
- Blandford and Faulkner in 1849, the Rev Wilkinson in 1867, AC Pass in
1886, and Flinders Petrie just after World War I. But until recently the
standard interpretation was that of Richard Atkinson, formed as a result
of his televised excavations from 1968 to 1970, made with the bbc.

Atkinson dug trenches extensively - on the summit, down the slopes and
across the ditch. He reopened the tunnel, first dug in 1849, along the
old ground surface to the centre of the mound. If he, or his television
sponsors, were hoping for gold, or even for a single decent burial with
human bones, they were disappointed.

But he did reach conclusions about the structure of the hill, which he
believed to comprise an initial smallish mound of gravel and turf,
surmounted later by a second mound of chalk with a surrounding ditch,
over which was constructed the massive chalk mound that we see today.
The final mound, he thought, was built in tiers like a wedding cake,
arguing that the now-invisible lower terraces had become obscured by
weathering. Material from the tunnel suggested a Neolithic date - but
none of his radiocarbon dates were safe by today's standards.

The sudden collapse of the 1776 shaft at the summit in 2000 prompted a
new phase of research on the hill - including various forms of
non-invasive survey, seismic survey and limited excavation. Some of the
initial results of this English Heritage work have received press
publicity over the past two years, but the analysis has continued,
shedding light on many of Atkinson's conclusions and the history of the
hill.

Cores bored for the seismic survey indicated that no major turf line
developed between Atkinson's construction phases, refuting the theory
that each phase of the mound was left to stand for years before being
remodelled. Analysis of the cores also found that turf on the old ground
surface had been trampled and mixed with chalk - an evocative insight
into the busy activity involved in the mound's original construction.

Meanwhile, two small trenches cut on the summit by Fachtna McAvoy of
English Heritage's Centre for Archaeology revealed - for the first time
-a fragment of antler from a secure context, lying against a chalk wall
in a deposit of chalk rubble. This produced a secure radiocarbon date of
between 2490-2340 BC, placing the mound firmly in the Late Neolithic.

Outline surveys of the monument have been made in the past, and Atkinson
produced a photogrammetric contour plan from air photographs - but,
perhaps surprisingly, no full survey of the earthworks had been
undertaken before the English Heritage work of the past three years. The
breaks of slope, the ledges, platforms and scars that are visible to the
naked eye had not been recorded. As a result of the new work, we now
know that the mound is not circular, but that each level is a polyhedron
with a number of straight sides - as many as nine at the base, possibly
fewer towards the summit.

The mound that we see today is the product of several thousand years of
adaptation, use, weathering and erosion. Like any parish church, its
earliest features are partially obscured by those of more recent date.

Many of the scars on the summit and slopes are the result of past
excavations. The spoilheap around the 1776 shaft - still prominently
visible in the mid-19th century - has almost vanished, but the location
of Atkinson's trenches can be seen quite clearly. Crowded fairs took
place on the hill in the 18th century and they might account for some of
the dips and banks. But the winding path to the summit appears to be in
the same position as that noted by John Aubrey in his sketch made around
1665, so any scarps that the path cuts must predate it.

What of Atkinson's contention that the hill was raised in tiers? The new
survey work suggests otherwise. The uppermost terrace, when
circumnavigated, returns to a point several metres below the starting
point - in other words, it spirals down. Weathering has obscured the
detail of ledges further down the slope; but if we assume the feature is
continuous, it implies a spiral path all the way from the summit to the
base.

The idea of a spiral path is attractive. It would not only have provided
a processional route to the top of the hill, but would also have aided
the construction of the mound. Atkinson's tiered structure poses
enormous logistical problems for anyone hauling material to the higher
levels. Not impossible of course; and great amounts of scaffolding,
ladders, gantries and other construction paraphernalia could have been
used to help. However, a spiral would have allowed easier access, and
material could have been carried or dragged up to the working level with
considerably less fuss.

So what evidence is there of a Neolithic date for this spiral path? In
fact very little. Atkinson did find a portion of chalk rubble walling on
the inside edge of the upper terrace, which he claimed was similar to
walling on the summit; and as it appeared to extend into the mound, he
clung to a view that the terraces were part of the initial construction.
Some terraces visible today are clearly post-Neolithic, as they cut into
the mound's original profile. But we have no compelling evidence to
reject the idea that some type of spiral path or series of terraces did
indeed form part of the original design.

One intriguing aspect of Atkinson's and the earlier excavations at
Silbury is that many more Roman and early medieval finds were produced
than Neolithic. In the 19th century, a substantial Roman building was
found south of the hill. Cutting into the mound at ground level in 1867,
Wilkinson found a platform just below the surface on which was a pile of
ashes associated with Romano-British artefacts. Atkinson himself found
over 100 Roman coins in the ditch, while numerous Roman shafts and wells
were found nearby. From this evidence alone, it was not surprising that
some researchers have claimed that Silbury was a sacred site in the
Roman period.

Then, over the past decade, the Roman evidence increased. A combination
of pipeline excavations and aerial photography has revealed the extent
of Romano-British settlement on the lower slopes of Waden Hill - a
natural hill next to Silbury. It now seems almost inconceivable that,
with a Romano-British settlement facing the mound, Silbury was not used
in some way. It may be that the mound was once covered with burials,
monuments and memorials, and that what has been found so far is the tip
of the iceberg.

Atkinson's medieval evidence was no less striking. Small postholes
containing iron nails, early medieval potsherds and a silver coin of
Ethelred II dating to 1010 suggested that the terraces had been revetted
by posts. He also found an iron spearhead, and explained the evidence as
defence against the Danish invasions - not unreasonably, given the
skirmish at nearby East Kennet in 1006 reported in the Anglo-Saxon
Chronicle. He concluded that the original terraces had been recut and
fortified. The postholes, however, are located on the inside of each
terrace and therefore imply revetment rather than defence.

It seems more likely, perhaps, that Silbury Hill was used as the site
for a prestigious building, perhaps a Christian building, in the early
medieval period. If the mound had been sacred in the Roman era, it is
possible that it retained its religious attraction in later centuries.

Locally, the struggle to establish Christianity appears to have been
quite vigorous. The presence of a Saxon cross, followed by the founding
of a Christian church at Avebury - within sight of Silbury - emphasises
the enormous interest in the area during the conversion period. Avebury
subsequently attracted a monastic cell, and suffered attempts to destroy
its standing stones. Given this concern, and indeed papal encouragement,
to Christianise pagan monuments, it would be no surprise if Silbury Hill
also saw some form of Christian modification. Sadly no direct evidence
of Christianity has yet been found.

The ditch surrounding Silbury Hill is often considered a mere quarry
from which the mound material was derived. However, its circular nature,
and the regularity of its rectangular western extension, indicate that
it served more than a functional purpose.

Archaeologists have come to see that ditches, even massive ditches
around henges or hillforts, need not always be just utilitarian
structures but may have had a metaphysical function too - for example,
to keep evil spirits at bay. The rectangular extension at Silbury, if
waterfilled, would have served as a cistern or reservoir. Elsewhere in
the world, cisterns have often been the focus of ritual and ceremony.
The mirror-like quality of standing water may have had symbolic
implications too. Given archaeologists' fascination with shamanism, it
is significant that mirrors are considered symbols of shamanic ceremony
and power.

For just three days in early summer 2001, as the water-filled ditch
dried out, a huge vegetation mark, straight-edged and some 10m wide,
appeared to extend across the ditch floor for some 50m towards the
mound. Its orientation, however, was curious, running diagonally across
the ditch extension towards a position off-centre of the mound. The
feature definitely seems man-made. It may be that the hill's Neolithic
builders dug a deeper channel here to collect water from local springs
and bring it to the deep ditch encircling the mound.

It seems likely, then, that Silbury Hill's ditches were intentionally
filled with water. Furthermore, the hill itself was built next to water,
close to the River Kennet. The siting of this monumental mound in a
valley - so that its summit barely attains the level of the surrounding
hilltops - has often raised comment. Why not build higher up? The answer
must be that the place itself was as important as the mound.

Archaeologists have increasingly noted how many Neolithic and Bronze Age
monuments are built in 'liminal' or cross-over points in the landscape,
and close to water (ba, April 1999). The well-known monuments at
Newgrange in Ireland, for example, cluster alongside the River Boyne.
There are numerous other examples. Silbury is not only close to the
River Kennet, but also at a geologically liminal position, on the very
edge of the chalk where it abuts the river's flood plain.

Why was such a position considered important? And why build this
unparalleled, monumental mound? We will never have certain answers to
these questions. But the proximity of earlier monuments such as West
Kennet long barrow and the Windmill Hill causewayed enclosure shows that
Neolithic people had built monuments in the area for generations.

The place had an ancestral draw. The significance is obscure, and we can
only hope to understand it if we combine our scientific approach with a
vision that sees beyond modern-day beliefs about how landscape must have
been viewed and used in prehistory.

David Field is a field archaeologist with English Heritage, and was
responsible for the recent landscape survey of Silbury Hill