Publication Account
Date 2007
Event ID 586541
Category Descriptive Accounts
Type Publication Account
Permalink http://canmore.org.uk/event/586541
ND36 9 NYBSTER ('Brough Head') ND/3702 6314
Probable solid-based broch in Wick, Caithness, standing in a similar situation to Skirza Head (ND36 10, below) and Ness (ND36 8) – that is on a sheer-sided cliff promontory approachable only from one direction and which is defended by a massive curved outer wall. The site was excavated by Sir F Tress Barry in 1895-96 and the limited information gained was described by Anderson [2] who provides the only information about the work apart from a few photographs taken of the excavations. There are copies of all the Tress Barry photo-graphs in the Nicholson institute in Caithness and in the National Monuments Record of Scotland in Edinburgh. (visited in 1963, 1971 and 2005).
Nybster broch underwent further explorations in the summer of 2005 by a team from the National Museums of Scotland [16]. The discoveries made then will doubtless cause some of the ideas set out below to be modified.
Description
The promontory on which the site stands is about 45.8m (150ft) long and 41.2m (135ft) across at its widest part; it narrows to about 21.4m (70ft) at the seaward end. The main entrance faces just north of north-east, towards the sea, and is 4.27m (14ft) long; it is consistently 92cm (3ft) wide for the first 3.05m (10ft) at which point is set the door-frame. A pivot stone was found in position behind one of the door-checks. One check can be seen in a contemporary photograph and it gives the impression of being of built masonry rather than of a projecting slab. The pivot stone for the door was still in position in 1910, presumably behind the left check. No guard cell was found, and neither were any intra-mural features located during the original excavations; thus Nybster may be a simple ring of solid masonry and it stands nowhere higher than 1.53m (5ft).
However at about 10 o'clock there are signs of a possible raised doorway in the inner wallface, now built up; this was noticed both by the Commission [3] and by the author in 1963 but there are now no straight edges in the masonry and no firm conclusions can be drawn. On the general photograph which shows the interior after excavation this 'gap' should be at the left end of the circle but nothing seems to have been spotted at the time. Blocks may have been pulled out of the wall later.
It is quite possible that any intra-mural features which existed in this building were raised well above the floor, as at many other sites, so that no signs of these are preserved in the bottom 1.53m (5ft) of the inner face (Level 1). Nevertheless it is not impossible that Nybster was never more than a simple, massive-walled dun or roundhouse which was never very high; without evidence even of an intra-mural stairway its classification as a broch must remain tentative only. This site provides the well-known ambiguous answer to the question of whether the stump of a broch could ever have been a tall tower – "absence of evidence is not evidence of absence." It is striking that there is no second entrance here despite the fact that the broch doorway faces away from the outer defensive wall.
Two floor tanks or hearths were found on the north side of the central court and a drain ran out through the entrance passage. There are several radial slabs still visible set upright in the central court, which may be the remains of secondary structures; some of these continue the right side of the entrance into the interior. There is a small pit or well with a covering slab in the floor opposite the entrance.
According to Anderson the outer defences consist of a curved ditch and a massive wall just within this; the 'ditch' was said to be nearly 6.1m (20ft) wide and to run along “the segment of a circle” from one ravine to the other. No causeway is mentioned. However Swanson points out that there are no signs of a ditch apart from the trench dug by Tress Barry to expose the outer face of the outer wall [9], so Anderson may have mixed up his notes on Nybster with those on another site.
The wall is a massive curved barrier 3.05m (10ft) thick, increasing to about 4.58m (15ft) at the centre where the solitary entrance passage is situated. This wall is only about 1.89m (6ft) from the broch at its nearest point. The entrance is 4.5m long and 1.07m (3ft 6in) wide at the outer end; at 1.37m (4ft 6in) from the outside is the first door-frame built of slabs on edge set into the passage walls; after this the passage widens to 1.22m (4ft). A second door-frame is 3.66m (12ft) from the exterior and the plan suggests that there is an upright slab forming a sill stone at each door.
The thicker central part of this outer wall is relatively short (about 7.6m or 25 ft, including the passage) and at each end, on the inside face, is a short flight of steps, leading up towards the passage, which presumably gave access to the wallhead. The closeness of these flights of steps to the passage suggests that the outer wall was never very high; perhaps there was a parapet fronting the flat wall walk. The outer wall has evidently been modified more than once [9].
A number of round and nearly round chambers, connected by various walls, was found outside the broch on three sides. Again one tends to assume from the data from better excavated sites that these belong to a secondary phase of occupation (those abutting the broch on the seaward side surely do) but there is no way of being sure that this was the case at Nybster. The state of these 'outbuildings' in 1984 was recorded by Swanson [9].
Excavations in 2005
Re-excavation of the site began in 2005, by Andy Heald on behalf of the National Museums of Scotland [16]. Towards the end of July the work had already yielded some interesting results, including a bronze spiral finger-ring of classic middle Iron Age type from occu-pation deposits in one of the ‘outbuildings’ on the north-east side, confirming that the brochs in the north-east tip of Caithness belong to the Atlantic Iron Age tradition.
The broch itself is being re-examined, both in the central court and on the wallhead. An important discovery in 2005 was an occupation layer that extended under the wall, suggesting that the broch was built on an already inhabited site. This may support the idea that the promontory wall was the original defensive feature and that the broch was added later. Other internal features uncovered include a large rectangular enclosure of uncertain purpose – defined by large stone slabs on edge – and a water tank apparently sunk into the primary floor.
Trenches across the broch wall appear to confirm that it lacks any intra-mural features apart from the entrance. The core of packed sandstone slabs and rubble is preserved at the base, and looks suitable broch-like, but this is covered by shattered small rubble and soil; this gives the impression that the stump of the broch had been partly further destroyed and then evened off again with small rubble to provide the level, turfed wallhead seen in the photographs of the original excavation. It is curious that most of the the inner wallface stands higher than the surviving original wall core.
One interesting feature was found on the wallhead in the form of a small area of large, carefully laid flat slabs at about 9 o’clock. These are about 1.5m above the interior floor and may be the only direct evidence for Nybster having once been a hollow-walled tower. The slabs look like the neat floor of a raised doorway into the wall (the sides of which have completely vanished), which perhaps once led out on to the scarcement and on to the raised wooden floor which rested on it. The evidence is striking but is perhaps not yet quite positive enough to classify the site as a ‘broch’ rather than as a ‘probable broch’.
Early finds [2, 142: 7]
Bone objects included 7 awls or borers from 95-172mm in length, 3 long-handled combs, 2 of them decorated and 2 (including the plain one) with a fishtail handle, a flat almost rectangular piece (with slightly convex sides) 95mm long, perforated with 3 holes and having a flat, disc-shaped protrusion on one face, a small strip 54mm long with rounded ends and a carefully bored hole at each end and 1 small bead 13mm in diam.
Stone implements included half of a small cup or lamp, a sandstone whorl, a rough sandstone disc with a depression in the middle of one face, a thin, well-shaped disc of slaty stone, 95mm in diam. and smoothed on both faces, a sandstone disc 95mm in diam. and with an incomplete perforation 19mm wide in the centre, 1 broken whetstone 54mm long, an oval sandstone vessel 292mm long, 191mm wide and 83mm deep and a sandstone vessel 215mm by 184mm and 92mm deep. In the NMS (GA 698) there is also a complete handled cup (the handle mostly broken off) 112-114mm in diam. and 48mm deep which seems not to be one of those mentioned above; it has an incised groove running round it just below the rim.
Pottery included 1 sherd of a Roman Samian decorated bowl of form Dr. 37 [6, Table II].
Objects of fired clay included 2 small cups or crucibles of reddish clay and a mould fragment with a tapering, square-sided hollow.
Animals bones and food refuse included the skull of an ox and antlers of red deer and a sample of carbonised oats.
Finds in 2005
A major discovery was a complete bronze spiral finger-ring in the occupation deposits of a chamber north-east of the broch.
Dimensions: (1) wall thickness 4.27m (14ft), internal diameter 7.02m (23ft) and overall diameter therefore 15.56m (51ft) [3]; (2) from the author's measurements – overall diameter 15.71m (51ft 6in), internal diameter (avg.) 6.25m (20ft 6in), therefore wall thickness c. 4.73m (15ft 6in). The average wall proportion is thus 60%. A careful survey of the central court in 1971 showed that it had been built close to an exact circle with a radius of 3.21 + 0.06 m, that is with a diameter of 6.42m (21.05ft).
Sources: 1. NMRS site no. ND 36 SE 4: 2. Anderson 1901, 139-42: 3. RCAHMS 1911b, 159-60, no. 518, and fig. 42: 4. Young 1962, 184: 5. Discovery and Excavation in Scotland 1981, 18: 6. Robertson 1970. 205: 7. Proc Soc Antiq Scot 43 (1908-09), 14-15 (finds): 8. Lamb 1980b, 20-1: 9. Swanson (ms) 1985, 571-76 and plan: 10. Batey (ms) 1981, no. 91: 11. R Gourlay in Discovery and Excavation Scotland 1981, 18: 12. Close-Brooks 1995, 148-9: 13. Hartley 1972, 54, no. 2: 14. Heald and Jackson 2001, 129-47: 15. A. Heald in Discovery and Excavation in Scotland, 2005
E W MacKie 2007
