Excavation

Date 6 January 1992 - 13 March 1992

Event ID 1034054

Category Recording

Type Excavation

Permalink http://canmore.org.uk/event/1034054

A programme of fieldwork was concentrated on two areas of the post-medieval defences of the castle in advance of prposed development. Area 1: The Interior of a building variously described as the Cart Shed or Straw Store. Area 2: An extensive area in front of the main 16th century facade and N of the Queen Anne casemates.

Area 1: Excavation Report

After the concrete floor from the interior of the Cart Shed was lifted, a series of soft earth deposits were ultimately removed down to bedrock over most of the area. The finished levels were specified by the required depth from architects' plan, so wherever that level was reached, excavation stopped. The broad phases of activity in this trench can be summarised as: Phase 1: Two apparently independent routes up to castle rock cut in bedrock. Phase 2: Defensive ditch and roadway wall built. Phase 3: Timber building constructed over infilled phase 2 wall and ditch. Phase 4: Straw Store/Cart Shed built. Phase 5: Cart Shed converted by demolition of N wall.

Phase 1

The Castle rock itself is a tightly jointed doleritic sill with pronounced regular bedding planes. Where exposed in Area 1, the bedrock surface showed signs of much weathering and wear (much more pronounced than the bedrock found in Area 2) and apart from efforts to prize sections of the sill apart to create space for Phase 3 timbers, showed sign of particular wear in 2 areas. To the SW of Area 1 two lines of 'wear' apparently evidence of vehicular traffic, were picked up, running down towards the SW. This roadway showed signs of having been levelled up and repaired with mortar rubble, resulting in a full width of 1.6m. Part of an arguably earlier trackway was picked up towards the N of Area1. This took the form of a pronounced gully or rut worn into bedrock, truncated by later ditch and associated wall F.040 and which may well be the southern side of a road, predating the ditch and wall construction of Phase 2.

Phase 2 c 1550-c1670

The S route was retained as main access to the Castle during the period of the pre-Queen Anne rebuilding programme. The creation of the French Spur saw the excavation of a deep ditch to the SE and protecting the main entrance route. Part of the ditch appeared at the NW corner of Area 1, underlying part of the N wall of the Cart Shed. It was cut against bedrock but may well be an enhancement of a natural outcropping. The ditch was tested to a depth of 2m and was not bottomed. A light mortar bonded wall lat across the southern side of the ditch - built directly onto the bedrock. This wall (F.040) was poorly preserved but proved to be 500mm wide and despite being truncated by the N wall of the Cart Shed, ran for a distance of 4.8m.

Phase 3.

The Phase 2 wall was demolished and levelled down to 2 or 3 courses, and its associated ditch was infilled with an homogeneous dump of dark earth and stones. The area was generally levelled up to receive a series of timber pads and post holes, reflecting at least one long wall of a timber building aligned E/W. There were in total 3 positive post holes (F.032, 023, 012) with one possible (F.024) with 2 pads (F.025 and 016). The settings were formed from the rubble infill of a series of crudely excavted areas on the bedrock, following the approximate line of the N edge of the Phase 2 trackway. The post settings were essentially squared voids 200mm by 200mm, and 1.5m apart. There was a possible entrance towards the W edge of the line, between the posts F.025 and F.012, defined by a door post stone (F.019). The role of pads F.025 and more enigmatically F.016 is not clear, and it

may be that the timber settings reflect enclosures rather than roofed structures. In any event, it seems that the Phase 3 timbers were temporary precursors to the Straw Store/Cart Shed which was in place by 1860.

Phase 4

The foundations for the Cart Shed walls were cut against the accumulated floor/occupation surfaces from Phase 3 activity, set within irregular foundation trenches, which varied in width from 150mm to 300mm. The depth of the distinctive shaped foundations also varied- deepening considerably to hit towards the SE, a depth of 1.2m. Once a level footing for the faced masonry was in situ, the floor was laid, characterised by mortar spreads (recycled builders' debris). Then the walls were raised to full height, with an apparent door towards the W end of the N wall. This was reflected by a distinctive recess in the S face of the N wall at this point and an equivalent projection of the N face. This does not admittedly concur with the 1860 plan which shows a centrally placed door in the N wall but no signs of such were revealed in the excavation due to damage in Phase 3.

Phase 5

The present open N wall with squared ashlar pillar was formed by the demolition of the Phase 4 N wall to virtually foundation level and the raising of floor and immediate exterior surfaces by 300mm. This was ultimately concreted over and saw use as a 'garage'.

Conclusion

The significance of the excavation in this area can be summarised as: (1) The identification of late medieval access to the castle truncated by 16th century works. (2) The presence of temporary wooden structures predating mid 19th century cart shed/straw store.

Area 2: Excavation Report

The earliest feature revealed on the site was a cut in the granite bedrock in the NW corner of the trench. The natural cleavage of the rock had been exploited to exaggerate a natural drop or, possibly, in order to create a ditch. The line of the feature respected the early 16th century castle frontage and may be a defensive feature associated with this, or perhaps an earlier phase if this is a raised position.

The excavations uncovered a length of the wall built during the regency of Mary of Guise c1559 (shown on Slezer's 17th century plan). This ran S from the section excavated in the late 1970's.

Presumably there must have been a certain amount of landfill between this wall and the early 16th century frontage, but these deposits were not reached before the required depth of excavation.

The Mary of Guise wall was used as the foundation for the battery defences built between 1708 and 1714 during the reign of Queen Anne. It seems likely that the battery wall and casemates were built almost free standing - certainly no foundation trenches were noted. The ramp wall leading down into the area was also built in this phase. Once the lower courses of these structures were laid, material was dumped against them to secure them and to raise the level of the area in general.

The original base levels of the ramp and casemate walls was indicated by the quoins uncovered reflecting a ground surface approximately 1.5m below that of the modern one.

On the 1725 plan of Stirling, the ramp wall is not shown, although the structural details are exactly the same as those of the casemate corners. However this plan shows the battery wall and the casemate extending further than they do today. There is evidence for this on the site - although not for a 2-floor barrack. A well-constructed mortared square plinth F127 was found which was inline with the casemate frontage and exactly the width of an arch from the surviving casemates. The lack of demolished wall, signs of bonding to the battery wall or remnants of vaulting suggests that the end structure was for a different purpose - possibly an outhouse for large pieces of equipment such as artillery or carts.

It is not known for how long the Queen Anne battery and casemates were used in their original form, but at some point (or points) before 1860 the layout of the area radically changed. The end casemate was demolished and the ramp wall was foreshortened. A long subdivided lean-to (three foundation piles for which were excavated) was placed against the early 16th century castle frontage and another built where the end casemate stood. The whole ground level for the area was raised by approximately 1m including within the casemates. The ramp down into the area was raised and formed by the considerable dumping of rubble given a smoother surface by the use of mortar. Cobbles/sets may also have been used over this.

However, by the late 1860's the lean-to against the 16th century frontage had been demolished, the casemates were contractors stores and the lean-to on the site of the demolished end casemate was used as an engine house. This structure was used until 1991 when it was demolished. The access routes and general ground levels in the area remained much the same as in the 19th century, the only real changes being the laying of electricity and telephone cables and the late 1970's excavations.

Thus, despite the slightly unpromising nature of the area to then be excavated, features dating from the late-medieval period onwards were uncovered, the history of the use of the Mary of Guise and Queen Anne period defences elucidated the survival of early 18th century deposits (and their contents) confirmed.

G Ewart 1992

Sponsor: Historic Scotland

Kirkdale Archaeology