Recumbent Stone Circle

A recumbent stone circle (RSC) is a cohesive regional tradition of Chalcolithic and Early Bronze Age megalithic architecture concentrated between the River Dee and the Moray Firth in Aberdeenshire and Moray in northeastern Scotland, where between 70 and 100 monuments were erected between approximately 2400 and 1800 cal BCE. Readily recognizable in the field and unique within British archaeology (apart from a small related cluster of axial stone circles in Cork and Kerry in southwestern Ireland), a recumbent stone circle consists of an oval or circular ring of 8 to 13 freestanding orthostats (18 to 26 meters in diameter) that are systematically graded in height so that the shortest monolith stands in the north or northeast and the stones grow progressively taller toward the south or southwest. Occupying the apex of this southern/southwestern arc is the monument's focal centerpiece: a single colossal horizontal stone block—the recumbent (measuring 2.5 to 5.2 meters long and weighing 10 to 50 metric tons)—laid flat on its side with a carefully leveled horizontal upper rim and framed tightly at either end by the two tallest upright monoliths in the ring, known as the flankers. Famous well-preserved examples include Easter Aquhorthies, Loanhead of Daviot, Midmar Kirk, Sunhoney, Tomnaverie, Cothiemuir Wood, and Castle Fraser.

Pioneering metric surveys by Fred Coles (1900–1906), Alexander Keiller (1934), and Aubrey Burl (The Stone Circles of the British Isles, 1976), combined with modern stratigraphic excavations by Richard Bradley (1999–2005) and Adam Welfare (Great Crowns of Stone, 2011), have defined the rigorous architectural grammar of the Aberdeenshire RSC:

1. The Recumbent Block and Its Chock-Stone Foundation

The recumbent stone is invariably the heaviest single megalith on the site—reaching 24 tonnes at Easter Aquhorthies, 35 tonnes at Old Keig, and nearly 50 tonnes at Kirkton of Bourtie. Because the builders demanded that the top edge of the recumbent form a dead-level horizontal window frame against the distant southern skyline even when the lower base of the boulder was irregular or keel-shaped, they excavated a foundation trench, wedged heavy chock stones underneath the asymmetric belly of the block, and packed a cobble platform around its base. While the inner face of the recumbent looking into the circle was dressed flat and smooth, the outer face was frequently left rough or convex.

2. The Flanking Pillars ("Flankers") and Height Grading

Standing directly adjacent to the eastern and western ends of the recumbent—sometimes touching it or curved slightly inward to clasp its ends—are the two flankers, which always constitute the tallest vertical menhirs of the entire circle (2.4 to 3.4 meters high). From the flankers, the remaining 6 to 11 monoliths of the circle step down symmetrically in height around both the eastern and western arcs until reaching the shortest stone (~1.0 to 1.3 meters high) directly opposite the recumbent in the north-northeast—mirroring the southwest-to-northeast height grading observed in neighboring Moray Firth Clava cairns.

3. Lithological Color-Coding and Cup-Marks

Just as at Balnuaran of Clava, RSC builders practiced deliberate petrological color-coding:

• At Easter Aquhorthies near Inverurie, the circle monoliths are pink and red porphyry and red jasper-granite, whereas the recumbent and its two flankers are contrasting grey-black Grampian granite.
• At Sunhoney, Loanhead of Daviot, Rothiemay, and Cothiemuir Wood, the upper rim or inner vertical face of the recumbent stone or its eastern flanker was embellished with pecked cup-marks (up to 31 cups at Sunhoney and 80+ cups and cup-and-rings at Rothiemay).

For nearly eighty years following Alexander Keiller and H. E. Kilbride-Jones's 1930s excavations at Loanhead of Daviot and Old Keig, archaeologists assumed that the freestanding stone circle and recumbent setting were erected first as an open Late Neolithic sanctuary, and that the internal ring cairn found inside the circle was added centuries later as a secondary Bronze Age intrusion.

Between 1999 and 2002, Richard Bradley directed targeted re-excavations at three Aberdeenshire RSCs—Tomnaverie in the Howe of Cromar, Cothiemuir Wood, and Achnabreck / Strichen—that inverted the traditional construction sequence:

1. Stage 1 — Hilltop Funeral Pyre (c. 2400–2100 cal BCE): Activity on the hilltop summit began with open-air cremation pyres lit directly on the prepared ground surface, leaving behind spreads of wood charcoal, burnt quartz, calcined human bone, and Bell Beaker sherds.
2. Stage 2 — Polygonal Kerbed Ring Cairn: Over the cooled pyre site, builders constructed a low polygonal or circular ring cairn revetted by an outer boulder kerb and radial stone divisions, leaving a hollow open central court (5 to 7 meters wide) in which further cremations and crushed white quartz were deposited. Significantly, the southwest arc of the ring cairn kerb was already built with a recessed flat platform prepared to receive the future recumbent stone.
3. Stage 3 — Erecting the Recumbent and Stone Circle as a Closing Act (c. 2000–1800 cal BCE): As the final stage of construction, builders hauled the 15-to-30-tonne recumbent stone into the prepared notch on the southern/southwestern perimeter of the cairn, erected the two flankers and the graded ring of monoliths around the outer edge of the cairn platform, and frequently blocked the open central court of the ring cairn with rubble, sealing the monument permanently so that the recumbent stone barred any further physical entry along the southwestern axis.

Surveyed by Alexander Thom, Aubrey Burl, and Clive Ruggles (Astronomy in Prehistoric Britain and Ireland, 1999), the azimuths connecting the center of each RSC to the midpoint of its recumbent stone fall consistently within a 95° arc between south-southeast (147°) and southwest (237°)—an arc across which the sun never rises or sets at the latitude of Aberdeenshire (57° N), where even the midwinter solstice sunset occurs near ~223°–227°. Instead, Ruggles and Burl demonstrated that the horizontal top rim of the recumbent stone and its tall vertical flankers were engineered as an elevated horizon foresight framed against the nighttime southern sky to track the midsummer full moon across its 18.6-year lunar nodal cycle (between the Major and Minor Lunar Standstills). During summer nights around the major standstill, the low-hanging full moon skims almost horizontally across the southern hilltops at an altitude of only 2° to 6°, gliding directly between the two tall flanker pillars above the white quartz-strewn surface of the recumbent stone before sinking behind the western flanker.

Where are recumbent stone circles found?

Over 90% of all recumbent stone circles are concentrated within a single compact region of northeastern Scotland (primarily Aberdeenshire, Banffshire, Kincardineshire, and Moray between the Dee and Spey valleys). The only comparable tradition elsewhere in the British Isles is the group of Axial Stone Circles (such as Drombeg and Reanascreena) in Counties Cork and Kerry in southwestern Ireland, where a smaller flat-topped axial stone sits opposite a pair of tall portal stones.

Was the recumbent stone an altar for human sacrifice?

No. Seventeenth- and eighteenth-century antiquarians such as John Aubrey and William Stukeley popularized the romantic myth that recumbent stones were "Druidic altars" used for blood sacrifice. Modern archaeological excavations by Richard Bradley and Adam Welfare prove that the recumbent stone was placed at the end of the monument's construction to seal off a ring cairn cremation sanctuary and frame the low southern trajectory of the moon against the horizon.

Which came first: the stone circle or the cairn inside it?

Excavations at Tomnaverie, Cothiemuir Wood, and Strichen proved that the internal ring cairn (built over a cremation pyre site) was actually constructed first, and that the recumbent stone, its flankers, and the outer circle of graded standing stones were erected last as a monumental closing ring around the cairn.

1. Welfare, A. (2011). Great Crowns of Stone: The Recumbent Stone Circles of Scotland. Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS). https://canmore.org.uk/book/802221
2. Bradley, R. (2005). The Moon and the Bonfire: An Investigation of Three Stone Circles in North-East Scotland. Society of Antiquaries of Scotland. https://doi.org/10.5284/1038989
3. Burl, A. (2000). The Stone Circles of Britain, Ireland and Brittany. Yale University Press. https://doi.org/10.1017/S0003598X00060725
4. Ruggles, C. L. N., & Burl, H. A. W. (1985). "A new study of the Aberdeenshire Recumbent Stone Circles, 2: Interpretation." Archaeoastronomy, 8 (Journal for the History of Astronomy Supplement, 16), S25–S60. https://doi.org/10.1177/002182868501600903
5. Kilbride-Jones, H. E. (1935). "An account of the excavation of the stone circle at Loanhead of Daviot, and of the standing stones of Cullerlie, Echt, both in Aberdeenshire." Proceedings of the Society of Antiquaries of Scotland, 69, 168–223. https://doi.org/10.9750/PSAS.069.168.223