The remarkable archaeological record of Neolithic Orkney has ensured that these islands play a prominent role in narratives of European late prehistory, yet knowledge of the subsequent Bronze Age is comparatively poor. The Bronze Age settlement and cemetery at the Links of Noltland, on the island of Westray, offers new evidence, including aDNA, that points to a substantial population replacement between the Late Neolithic and Bronze Age. Focusing on funerary practice, the authors argue for interconnecting identities centred on household and community, patrilocality and inheritance. The findings prompt a reconsideration of the Orcadian Bronze Age, with wider implications for population movement and the uptake of cultural innovations more widely across prehistoric north-western Europe.

The Neolithisation of Europe involved socio-economic and biological adaptations to new environments. The use of seaweed as livestock fodder, for example, was key to the introduction of animal husbandry to the Orkney archipelago, c. 3500 cal BC. Using stable isotope analysis of faunal remains from Skara Brae, this study provides new evidence for, and clarifies the chronology of, the adoption of seaweed consumption by sheep. The results show that sheep consumed moderate amounts of seaweed from the moment of their introduction to Orkney—a practice that facilitated the successful spread of the farming lifeways to the most remote areas of Europe.

This paper examines the relationship between the use of late Irish passage tombs and the development of the British and Irish Grooved Ware complex, including its Orcadian origins. The architectural forms of these passage tombs and their associated material culture, symbolic repertoires, and depositional practices in Ireland and Orkney indicate sustained connections between people in these places. It is argued that these interactions strongly influenced the development of Grooved Ware and its associated material culture in Orkney and beyond. The results of recent dating programmes are synthesised, and the character of depositional practices from 3300 to 2700 cal bc are reassessed to highlight continuities in traditions of practice and representation. Together, these indicate that the adoption of Grooved Ware in Ireland did not herald an era of large-scale social transformation and that the primary use of late passage tombs did not suddenly cease at the end of the 4th millennium bc. Instead they continued as foci for largely unchanged forms of ceremonial activity until 2450 cal bc as part of a series of ongoing social and cultural shifts in people’s material culture and practices. It is argued that the current periodisation of the late 4th–3rd millennia bc in Ireland unduly emphasises a disjuncture between the Irish Middle and Late Neolithic. An alternative view of social and cultural change that refocuses attention on social agency is proposed.

Orkney is internationally recognised for its exceptionally well-preserved Neolithic archaeology. The chronology of the Orcadian Neolithic is, however, relatively poorly defined. The authors analysed a large body of radiocarbon and luminescence dates, formally modelled in a Bayesian framework, to address the timescape of Orkney's Late Neolithic. The resultant chronology for the period suggests differences in the trajectory of social change between the ‘core’ (defined broadly as the World Heritage site) and the ‘periphery’ beyond. Activity in the core appears to have declined markedly from c. 2800 cal BC, which, the authors suggest, resulted from unsustainable local political tensions and social concerns.

In the context of unanswered questions about the nature and development of the Late Neolithic in Orkney, we present a summary of research up to 2015 on the major site at the Ness of Brodgar, Mainland Orkney, concentrating on the impressive buildings. Finding sufficient samples for radiocarbon dating was a considerable challenge. There are indications, from both features and finds, of activity pre-dating the main set of buildings exposed so far by excavation. Forty-six dates on thirty-nine samples are presented and are interpreted in a formal chronological framework. Two models are presented, reflecting different possible readings of the sequence. Both indicate that piered architecture was in use by the thirtieth century cal bc and that the massive Structure 10, not the first building in the sequence, was also in existence by the thirtieth century cal bc. Activity associated with piered architecture came to an end (in Model 2) around 2800 cal bc. Midden and rubble infill followed. After an appreciable interval, the hearth at the centre of Structure 10 was last used around 2500 cal bc, perhaps the only activity in an otherwise abandoned site. The remains of some 400 or more cattle were deposited over the ruins of Structure 10: in Model 2, in the mid-twenty-fifth century cal bc, but in Model 1 in the late twenty-fourth or twenty-third century cal bc. The chronologies invite comparison with the near-neighbour of Barnhouse, in use from the later thirty-second to the earlier twenty-ninth century cal bc, and the Stones of Stenness, probably erected by the thirtieth century cal bc. The Ness, including Structure 10, appears to have outlasted Barnhouse, but probably did not endure as long in its primary form as previously envisaged. The decay and decommissioning of the Ness may have coincided with the further development of the sacred landscape around it; but precise chronologies for other sites in the surrounding landscape are urgently required. The spectacular feasting remains of several hundred cattle deposited above Structure 10 may belong to a radically changing world, coinciding (in Model 2) with the appearance of Beakers nationally, but it was arguably the, by now, mythic status of that building which drew people back to it.

Radiocarbon dating and Bayesian chronological modelling, undertaken as part of the investigation by the Times of Their Lives project into the development of Late Neolithic settlement and pottery in Orkney, has provided precise new dating for the Grooved Ware settlement of Barnhouse, excavated in 1985–91. Previous understandings of the site and its pottery are presented. A Bayesian model based on 70 measurements on 62 samples (of which 50 samples are thought to date accurately the deposits from which they were recovered) suggests that the settlement probably began in the later 32nd century cal bc (with Houses 2, 9, 3 and perhaps 5a), possibly as a planned foundation. Structure 8 – a large, monumental structure that differs in character from the houses – was probably built just after the turn of the millennium. Varied house durations and replacements are estimated. House 2 went out of use before the end of the settlement, and Structure 8 was probably the last element to be abandoned, probably during the earlier 29th century cal bc. The Grooved Ware pottery from the site is characterised by small, medium-sized, and large vessels with incised and impressed decoration, including a distinctive, false-relief, wavy-line cordon motif. A considerable degree of consistency is apparent in many aspects of ceramic design and manufacture over the use-life of the settlement, the principal change being the appearance, from c. 3025–2975 cal bc, of large coarse ware vessels with uneven surfaces and thick applied cordons, and of the use of applied dimpled circular pellets. The circumstances of new foundation of settlement in the western part of Mainland are discussed, as well as the maintenance and character of the site. The pottery from the site is among the earliest Grooved Ware so far dated. Its wider connections are noted, as well as the significant implications for our understanding of the timing and circumstances of the emergence of Grooved Ware, and the role of material culture in social strategies.

New radiocarbon dates for the Neolithic settlement at Pool on Sanday, Orkney, are interpreted in a formal chronological framework. Phases 2.2 and 2.3, during which flat-based Grooved Ware pottery with incised decoration developed, have been modelled as probably dating to between the 31st and 28th centuries cal bc. There followed a hiatus of a century or so, before the resumption of occupation in Phase 3, which has a different Grooved Ware style featuring the use of applied decoration. This has been modelled as probably dating from the 26th to the 24th centuries cal bc. The implications of these results are discussed for the emergence and development of Grooved Ware, and for the trajectory of settlement and monumentality on Sanday.

Gelatinous zooplankton including salps are an important but often overlooked component of marine ecosystems. This study documents a bloom of Salpa fusiformis at five locations to the north of mainland Scotland. The bloom was observed at Sula Stack, Sula Sgeir, North Rona and at two other locations to the west coast of the Orkney Islands. Salp blooms have the potential to deplete phytoplankton biomass, impacting on other zooplankton, including copepods and fish larvae. New records of two rare salps Cyclosalpa bakerii and Thetys vagina are also documented from North Rona and Skirza Head, Caithness. These specimens were observed in the aggregate (sexual) form. These observations represent the second record in the UK of C. bakerii and the third and fourth records of T. vagina.

The primitive sheep of North Ronaldsay Island (Orkney), which feed almost exclusively on seaweed, have developed physiological features linked to that diet. The use of seaweed to feed domestic animals, attested for centuries in north-western Europe, may have appeared soon after the arrival of the first domestic herds during the 5th and 4th millennia BC. The use of isotope analysis of sheep tooth enamel as a means to investigate seaweed grazing in prehistoric times was tested. The teeth of five modern North Ronaldsay sheep were analysed for carbon (δ13C) and oxygen (δ18O) isotope ratios. Owing to differences in the δ13C of marine vs terrestrial plants, the seaweed-eating sheep have δ13C values clearly outside the range expected for terrestrial plant eaters. Results show that one group of individuals relied exclusively on seaweed throughout the year. In a second group, terrestrial plants provided about half the dietary carbon pool during the summer. In individuals relying exclusively on seaweed, the amplitude of seasonal change in the δ18O values of tooth enamel was low, possibly because of ingestion of marine water through fresh seaweed consumption. Analysis of a sheep tooth from the Neolithic site of Holm of Papa Westray (Orkney, Scotland), suggests that as early as at the beginning of the 4th millennium BC in the Orkney, seaweed contributed to the winter diet of domestic sheep.

Stable isotope measurements and radiocarbon dates on 54 burials from northern Scotland document trends in marine protein consumption from the late Iron Age to the end of the Middle Ages. They illuminate how local environmental and cultural contingencies interrelated with a pan-European trend towards more intensive fishing around the end of the first millennium AD. Little use was made of marine foods in late Iron Age Orkney despite its maritime setting. Significant fish consumption appeared in the Viking Age (ninth to eleventh centuries AD), first in the case of some men buried with grave-goods of Scandinavian style but soon among both sexes in ‘Christian’ burials. There was then a peak in marine protein consumption from approximately the eleventh to the fourteenth centuries AD, particularly among men, after which the importance of fish-eating returned to Viking Age levels. The causes of these developments probably entailed a complex relationship between ethnicity, gender, Christian fasting practices, population growth, long-range fish trade and environmental change.

Diet and ethnicity are strongly related. Recent work on fish-bone ratios and stable carbon isotopes suggest that the Vikings increased the fish contribution to the diet of Orkney and Shetland by a greater investment in deep-sea fishing.

The authors examine critically MacKie's long-standing contentions concerning Neolithic Britain — theocratic control of society, the relationships between monuments and sunrise or sunset on significant days of the year, the use of an ‘elaborate and accurate’ solar calendar and its survival into the Iron Age and into modern times.

The decoration of Neolithic passage-graves in Scotland and the British Isles/Ireland has come under renewed scrutiny–showing interesting patterns between tombs and houses. Here Richard Bradley examines two Orkney tombs and compares their decorated stones with motifs in Ireland and elsewhere.