References of "Stewart, John"
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See detailAnalysis of collagen preservation in bones recovered in archaeological contexts using NIR Hyperspectral Imaging
Vincke, Damien; Miller, Rebecca ULg; Stassart, Edith ULg et al

in Talanta (2014), 125

The scope of this article is to propose an innovative method based on Near Infrared Hyperspectral Chemical Imaging (NIR-HCI) to rapidly and non-destructively evaluate the relative degree of collagen ... [more ▼]

The scope of this article is to propose an innovative method based on Near Infrared Hyperspectral Chemical Imaging (NIR-HCI) to rapidly and non-destructively evaluate the relative degree of collagen preservation in bones recovered from archaeological contexts. This preliminary study has allowed the evaluation of the potential of the method using bone samples from the Early Upper Palaeolithic, Mesolithic and Neolithic periods at the site of Trou Al'Wesse in Belgium. NIR-HCI, combined with chemometric tools, has identified specific spectral bands characteristic of collagen. A chemometric model has been built using Partial Least Squares Discriminant Analysis (PLS-DA) to identify bones with and without collagen. This enables the evaluation of the degree of collagen preservation and homogeneity in bones within and between different strata, which has direct implications for archaeological applications (e.g., taphonomic analyses, assemblage integrity) and sample selection for sub- sequent analyses requiring collagen. Two archaeological applications are presented: comparison between sub-layers in an Early Upper Palaeolithic unit, and evaluation of the range of variability in collagen preservation within a single Holocene stratum. [less ▲]

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See detailSerial population extinctions in a small mammal indicate Late Pleistocene ecosystem instability
Brace, Selina; Palkopoulou, Eleftheria; Dalén, Love et al

in Proceedings of the National Academy of Sciences of the United States of America (2012), 109(50), 20532-20536

The Late Pleistocene global extinction of many terrestrial mammal species has been a subject of intensive scientific study for over a century, yet the relative contributions of environmental changes and ... [more ▼]

The Late Pleistocene global extinction of many terrestrial mammal species has been a subject of intensive scientific study for over a century, yet the relative contributions of environmental changes and the global expansion of humans remain unresolved. A defining component of these extinctions is a bias toward large species, with the majority of small-mammal taxa apparently surviving into the present. Here, we investigate the population-level history of a key tundra-specialist small mammal, the collared lemming (Dicrostonyx torquatus), to explore whether events during the Late Pleistocene had a discernible effect beyond the large mammal fauna. Using ancient DNA techniques to sample across three sites in North-West Europe, we observe a dramatic reduction in genetic diversity in this species over the last 50,000 y. We further identify a series of extinction-recolonization events, indicating a previously unrecognized instability in Late Pleistocene small-mammal populations, which we link with climatic fluctuations. Our results reveal climate-associated, repeated regional extinctions in a keystone prey species across the Late Pleistocene, a pattern likely to have had an impact on the wider steppe-tundra community, and one that is concordant with environmental change as a major force in structuring Late Pleistocene biodiversity. [less ▲]

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See detailInterprétation chronostratigraphique de la séquence holocène du Trou Al'Wesse à la lumière des nouvelles datations : du Mésolithique ancien au Néolithique moyen
Miller, Rebecca ULg; Stassart, Edith ULg; Otte, Marcel ULg et al

in Notae Praehistoricae (2012), 32

The AMS dates obtained for the Holocene sequence are stratigraphically coherent, and indicate occupations at Trou Al’Wesse during the Early, Late and Final Mesolithic phases and the during the Middle ... [more ▼]

The AMS dates obtained for the Holocene sequence are stratigraphically coherent, and indicate occupations at Trou Al’Wesse during the Early, Late and Final Mesolithic phases and the during the Middle Neolithic. This paper presents an interpretation of the chronostratigraphy in light of the recently obtained dates. [less ▲]

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See detailModave/Modave : nouvelles découvertes dans la séquence holocène du Trou Al'Wesse, fouilles 2009-2010
Miller, Rebecca ULg; Otte, Marcel ULg; Stewart, John

in Chronique de l'Archéologie Wallonne (2012), 19

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See detailLa séquence mésolithique et néolithique du Trou Al'Wesse (Belgique) : Résultats pluridisciplinaires
Miller, Rebecca ULg; Zwyns, Nicolas; Otte, Marcel ULg et al

in Anthropologie (L') (2012), 116

The site of Trou Al’Wesse has been interpreted as a site of possible contact between Mesolithic and Neolithic populations, given the discovery of Neolithic ceramics and Mesolithic tools in stratum 4 ... [more ▼]

The site of Trou Al’Wesse has been interpreted as a site of possible contact between Mesolithic and Neolithic populations, given the discovery of Neolithic ceramics and Mesolithic tools in stratum 4. However, recent excavations have also revealed the presence of three Early Mesolithic facies overlain by a Neolithic layer, while a Late Mesolithic presence is suggested for a fourth facies at the base of the terrace slope. Lithic and faunal analyses, as well as spatial analysis of the stratigraphic position of material recovered, indicate a clear separation of Mesolithic and Neolithic occupations. We present a new interpretation of the sequence of Holocene human occupations at Trou Al'Wesse in light of these data, arguing that the site was regularly occupied during the Early Mesolithic, forming a palimpsest of these visits, followed by an occupational hiatus and then re-occupation during the Late Mesolithic. The Early Neolithic is a separate occupation clearly unrelated to the Early Mesolithic underlying it, but ongoing fieldwork may recover data concerning the Final Mesolithic and its relation to the Early Neolithic at the site. [less ▲]

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See detailLe Trou Al'Wesse du Moustérien au Néolithique dans la vallée du Hoyoux
Miller, Rebecca ULg; Collin, Fernand ULg; Otte, Marcel ULg et al

in Toussaint, Michel; Di Modica, Kevin; Pirson, Stéphane (Eds.) Le Paléolithique moyen en Belgique : Mélanges Marguerite Ulrix-Closset (2011)

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See detailBiotically constrained palaeoenvironmental conditions of a mid-Holocene intertidal lagoon on the southern shore of the Arabian Gulf: evidence associated with a whale skeleton at Musaffah, Abu Dhabi, UAE
Stewart, John; Aspinall, S; Beech, M et al

in Quaternary Science Reviews (2011), 30

Whale remains (a left and right mandible, scapula, humerus and fragmentary radius and ulna as well as parts of the cranium and rostrum) belonging to a probable humpback whale (Megaptera cf. novaeangliae ... [more ▼]

Whale remains (a left and right mandible, scapula, humerus and fragmentary radius and ulna as well as parts of the cranium and rostrum) belonging to a probable humpback whale (Megaptera cf. novaeangliae) were found in the well-described sabkha sequence exposed in the Musaffah Industrial Channel, Abu Dhabi, United Arab Emirates. More precisely, the whale remains were found in a series of sediments representing a range of lagoonal facies. The sediments surrounding the whale bones were age-dated at approximately 5200 14C yrs BP and are herefore interpreted to correspond to the previously documented late Flandrian sea-level peak, receding a fall in sea-level which culminated in the supratidal sabkha overprint of the carbonates. associated with the whale remains is an assemblage of molluscs, foraminifera and ostracods. together with the inferred presence of sea grass and algae, these facies are interpreted to indicate a very shallow subtidal to intertidal lagoonal environment. Cirripede remains found associated with the skeleton were identified as those of the whale barnacle Coronula diadema and hence had their origins with the whale. Significantly, the low species diversity of microfossils suggests that higher salinities existed in the mid-Holocene lagoon than are present in modern counterparts. This is here inferred to be related to the onset of continental aridity in Arabia during the mid-Holocene. [less ▲]

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See detailThe Mesolithic of Trou Al'Wesse Cave (Belgium) in Regional Context
Miller, Rebecca ULg; Stewart, John; Zwyns, Nicolas et al

in Oosterbeek, Luis; Fidalgo, Claudia (Eds.) Miscellania, Volume 47 of the Proceedings of the 15th UISPP Congress (2011)

Recent excavations at the cave site of Trou al'Wesse (Modave, Belgium) have yielded significant new data concerning the Mesolithic occupations at the site that contribute to the understanding of the ... [more ▼]

Recent excavations at the cave site of Trou al'Wesse (Modave, Belgium) have yielded significant new data concerning the Mesolithic occupations at the site that contribute to the understanding of the chronology and environmental context of the Belgian Mesolithic. We present the results of the analyses of lithic and faunal assemblages, site taphonomy and spatial distribution, and discuss the relationship of the site with other Mesolithic sites in Belgium. [less ▲]

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See detailModave/Modave : elements du Mésolithique recent de la couche 4b-delta du Trou Al'Wesse
Miller, Rebecca ULg; Otte, Marcel ULg; Stewart, John

in Chronique de l'Archéologie Wallonne (2010), 17

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See detailNouvelles découvertes de la séquence holocène du Trou Al’Wesse : fouilles 2010
Miller, Rebecca ULg; Otte, Marcel ULg; Stewart, John

in Notae Praehistoricae (2010), 30

Excavations of the Holocene sequence at Trou Al'Wesse have yielded new elements related to Mesolithic occupations, in particular a human right mandible and a red deer antler hammer, as well as a possible ... [more ▼]

Excavations of the Holocene sequence at Trou Al'Wesse have yielded new elements related to Mesolithic occupations, in particular a human right mandible and a red deer antler hammer, as well as a possible Neolithic posthole. This article presents geological, archaeological and paleoanthropological data obtained during the 2010 season. [less ▲]

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See detailTrou Al’Wesse (Commune de Modave, province de Liège): la séquence pléistocène
Miller, Rebecca ULg; Otte, Marcel ULg; Stewart, John

in Chronique de l'Archéologie Wallonne (2009), 16

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See detailLe Mésolithique récent du Trou Al’Wesse (comm. de Modave, Prov. de Liège) Découverte de tessons de type non rubanés ou «Bereitkeramiek»
Miller, Rebecca ULg; Otte, Marcel ULg; Stewart, John

in Notae Praehistoricae (2009), 29

On the terrace of the site of Trou Al'Wesse, commun of Modave (province of Liège, Belgium), stratum 4b-δ, excavated in 2008, has been attributed to the Late Mesolithic. Ceramic sherds of La Hoguette type ... [more ▼]

On the terrace of the site of Trou Al'Wesse, commun of Modave (province of Liège, Belgium), stratum 4b-δ, excavated in 2008, has been attributed to the Late Mesolithic. Ceramic sherds of La Hoguette type have been recovered from near the top of this Mesolithic context, which contains lithic artifacts, a charcoal lens, wild fauna including an aurochs astragalus with cutmarks, and a sawn red deer crown antler. LBK sherds of the type found in overlying stratum 4a, are absent in facies 4b-δ. This is the first time that La Hoguette sherds have been found instratified context associated with material that can be radiometrically dated, and also the first time that such sherds have been discovered south of the Meuse and Sambre in Belgium. New dates from this stratum contribute to placing these sherds and the other elements in chronological context. [less ▲]

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See detailThe stratified Early to Late Mesolithic sequence at Trou Al'Wesse (Modave, Belgium)
Miller, Rebecca ULg; Stewart, John; Zwyns, Nicolas et al

in Crombé, Philippe; Van Strydonck, Mark; Sergant, Joris (Eds.) et al Chronology and Evolution within the Mesolithic of North-West Europe: Proceedings of an International Meeting, Brussels, May 30th-June 1st, 2007 (2009)

Ongoing excavations on the terrace of the cave site of Trou Al’Wesse (Modave, Belgium) have yielded evidence from a stratified sequence dating from the end of the Early Mesolithic to the Early Neolithic ... [more ▼]

Ongoing excavations on the terrace of the cave site of Trou Al’Wesse (Modave, Belgium) have yielded evidence from a stratified sequence dating from the end of the Early Mesolithic to the Early Neolithic. Stratum 4b is divided into a series of laterally superimposed facies ( - ), each of which contains palimpsests of lithics and fauna. The oldest facies ( ) has been dated to 9000±40 BP (Beta-209871) and the most recent ( ) to 6650±70 BP (Lv-1751). These dates demonstrate the regular re-occupation of the site during the Early and Late Mesolithic, with a significant occupational hiatus during the Middle Mesolithic. Isolated human remains include a cranial fragment dated to 6540±45 BP (OxA-10561) and a deciduous incisor. The interdisciplinary project integrates geological, archaeological and environmental data to address hypotheses related to continuity and change across the Pleistocene-Holocene transition and human response to changing environmental conditions, change during the Mesolithic period, and the Mesolithic-Neolithic transition. [less ▲]

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See detailModave/Modave : Interprétation des datations de la séquence holocène du Trou Al’Wesse
Miller, Rebecca ULg; Zwyns, Nicolas; Stewart, John

in Chronique de l'Archéologie Wallonne (2008), 15

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See detailRésultats préliminaires de l'étude de la séquence paléolithique au Trou Al'Wesse (comm. de Modave)
Miller, Rebecca ULg; Stewart, John; Otte, Marcel ULg

in Notae Praehistoricae (2007), 27

Nous présentons les résultats préliminaires de l'étude de la séquence pléistocène du Trou Al'Wesse. Il s'agit de données archéologiques et paléontologiques, ainsi que de nouvelles datations, précisant la ... [more ▼]

Nous présentons les résultats préliminaires de l'étude de la séquence pléistocène du Trou Al'Wesse. Il s'agit de données archéologiques et paléontologiques, ainsi que de nouvelles datations, précisant la position stratigraphique des occupations aurignaciennes et moustériennes. Two significant discoveries are presented: the first bone tools discovered in stratigraphic context (a point dating to the EUP) and two ungulate bone fragments with cutmarks (Mousterian). [less ▲]

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See detailTrou Al'Wesse, Belgium
Miller, Rebecca ULg; Stewart, John

in Mesolithic Miscellany (2006), 18(1), 2

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See detailTrou Al’Wesse : Campagne de fouilles 2006
Miller, Rebecca ULg; Zwyns, Nicolas; Stewart, John et al

in Notae Praehistoricae (2006), 26

We present the results of the analysis of the large mammals recovered from strata 4a et 4b at Trou Al'Wesse, which confirms the division of complex 4 into two strata and their attribution to the Neolithic ... [more ▼]

We present the results of the analysis of the large mammals recovered from strata 4a et 4b at Trou Al'Wesse, which confirms the division of complex 4 into two strata and their attribution to the Neolithic 'stratum 4a) and the Mesolithic (facies of stratum 4b). We also present a summary of the 2006 field season. [less ▲]

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See detailLa séquence holocène du Trou Al’Wesse : géologie, archéologie et environnement
Miller, Rebecca ULg; Zwyns, Nicolas; Stewart, John et al

in Notae Praehistoricae (2005), 25

This article presents the results analyses of the archaeological and faunal assemblages from the Holocene strata at Trou Al'Wesse (Modave, Liège Province, Belgium). Two strata of human occupation are ... [more ▼]

This article presents the results analyses of the archaeological and faunal assemblages from the Holocene strata at Trou Al'Wesse (Modave, Liège Province, Belgium). Two strata of human occupation are present in this sequence: the Early Neolithic in stratum 4.1 and the Late Mesolithic in stratum 4.2. The archaeological material includes lithics and ceramics. Faunal analysis of sample column K4 was done for paleoecological and taphonomic analysis of strata 4 and 12. [less ▲]

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