Stable isotope palaeodietary study of humans and fauna from the multi-period (Iron Age,Viking and Late Medieval) site of Newark Bay,Orkney

We report here on stable carbon and nitrogen isotope measurements of human and faunal bone collagen from the Iron Age, Viking Age, and Late Medieval site of Newark Bay, Orkney, Scotland. We found a wide range of results for humans in both δ¹³C (−15.4‰ to −20.3‰) and δ¹⁵N (8.6‰–15.6‰) values. The enriched carbon and nitrogen values indicate the consumption of significant amounts of marine protein, which is very unusual for post-Mesolithic (e.g. 4000 cal BC) UK and European populations. Also of interest is a statistically significant difference in δ¹³C (t = −2.48, p = 0.011) and δ¹⁵N (t = −2.44, p = 0.011) values, and therefore diets, between adult males and females at this site, with males (δ¹³C = −17.8 ± 1.2‰, δ¹⁵N = 13.2 ± 1.6‰) having, on average, a higher proportion of marine protein than females (δ¹³C = −18.9 ± 1.1‰, δ¹⁵N = 11.8 ± 1.8‰). The weaning age of the sub-adults was difficult to interpret due to the large isotopic variation in the adult females, but nearly all individuals between birth and 1.25 years have elevated δ¹⁵N values indicating that they were breastfed to some extent.     

Marine resource intensification in Viking Age Europe: the molluscan evidence from Quoygrew,Orkney

This paper addresses whether molluscan evidence from Orkney can shed light on the hypothesis that there was a trend towards the intensification of marine resource use at the end of the first millennium AD. The stratified middens of Quoygrew, which date from approximately the 10th to the 13th centuries, are shown to contain predominantly limpets, which may have been used for baiting fish. From metrical data it is shown that these limpets reduce in size through time. In order to test whether this observation is related to intensification in exploitation, analysis of limpet shoreline location was carried out. In addition, age data were used to demonstrate a lowering of average age which suggests intensification in gathering rather than environmental influences, particularly during the 11th–12th centuries at this site.     

A dental microwear study of seaweed‐eating and grazing sheep from Orkney

The potential of dental microwear for recognizing the use of seaweed as fodder in the past is explored through the analysis of microwear patterning in modern seaweed‐eating and grazing sheep from Orkney. Seaweed‐eating and grazing sheep are clearly distinguished on the basis of microscopic dental wear patterns. This reflects an emphasis on anterior‐posterior jaw movements and large pitted features in the seaweed‐eaters and can be attributed to the differing forces and/or masticatory movements required in the comminution of grasses and seaweed. Differences between seaweed‐eating and grazing individuals are maintained when the grazing group is expanded to include grazing sheep from Greenland and the Scottish borders. It is concluded that the microwear of seaweed‐eating sheep is highly distinctive and that dental microwear analysis potentially has a widespread application for identifying seaweed grazing within Scotland and the North Atlantic islands. Copyright © 2000 John Wiley & Sons, Ltd.