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University of Southampton Research Repository ePrints Soton Copyright © and Moral Rights for this thesis are retained by the author and/or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder/s. The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders. When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given e.g. AUTHOR (year of submission) "Full thesis title", University of Southampton, name of the University School or Department, PhD Thesis, pagination http://eprints.soton.ac.uk UNIVERSITY OF SOUTHAMPTON Faculty of Engineering, Science and Mathematics School of Geography Palaeoecology of human impact in Northwest England during the early medieval period: investigating ‘cultural decline’ in the Dark Ages. Emily E. Forster Thesis for the degree of Doctor of Philosophy, September, 2010 UNIVERSITY OF SOUTHAMPTON ABSTRACT FACULTY OF ENGINEERING, SCIENCE AND MATHEMATICS SCHOOL OF GEOGRAPHY Doctor of Philosophy PALAEOECOLOGY OF HUMAN IMPACT IN NORTHWEST ENGLAND DURING THE EARLY MEDIEVAL PERIOD: INVESTIGATING ‘CULTURAL DECLINE’ IN THE DARK AGES. Emily Elizabeth Forster The period following the Roman withdrawal from England in AD 410 has long been considered a time of ‘cultural decline’, owing to the relative paucity of archaeological evidence relating to this time and the dismal state of affairs described by the Dark Age historians Gildas (c AD 540) and Bede (AD 731). Traditionally this period has been viewed as a time of chaos in which farmland was abandoned and the population declined, leading to woodland regeneration in many areas. In Northwest England, archaeological remains for the early medieval period (c AD 410-1066) are sparse. Early palynological studies in Cumbria, for which radiocarbon dates were often lacking or imprecise, frequently assigned major ‘woodland clearances’ to the Romano-British period, woodland regeneration phases to the early Dark Ages, ‘subdued’ agriculture to Anglo- Saxon farmers and pastoral clearances to the actions of Norse settlers. The overarching aim of this study has been to question the validity of the above interpretations through analysis of pollen and diatom records from six tarns within the English Lake District. Of the sites investigated, both Loughrigg and Barfield Tarns produced good records for the study period. The pollen curves for Loughrigg Tarn appear to support the traditional interpretation of woodland regeneration in the early post- Romano-British period, while at Barfield Tarn the pollen indicates a largely open landscape with limited evidence for agriculture. Drawing together the data from these sites with the small body of extant palaeoecological research relating to this period, it is clear that the timing and nature of land-use varied across the region. This highlights the importance of localised pollen studies, particularly as regards the relationship between vegetation records and archaeological remains. Pollen-vegetation simulation experiments using HUMPOL (Bunting & Middleton, 2005) were a useful aid to interpretation, raising important questions regarding ‘woodland regeneration’ signals in pollen diagrams. CONTENTS i. List of tables, maps and figures ii. Declaration of authorship iii. Acknowledgements iv. Abbreviations/conventions used in the text Introduction (pp1-3) Chapter 1: Background to the project and a review of the literature (pp4-88) 1.1. Cultural decline in the Dark Ages? Readdressing the evidence (p4) 1.1.1. Views of the past: theoretical considerations (p5) 1.2. The early Dark Ages: post-Roman and Anglo-Saxon England (p7) 1.2.1. The traditional view: abandonment, cultural impoverishment and Anglo- Saxon invasion (p8) 1.2.1.1. Gildas: The ruin of Britain (De Excidium Britonum) (p10) 1.2.1.2. Bede: The ecclesiastical history of the English Nation (p12) 1.2.1.3. The Gallic chronicle (p13) 1.2.2. Post-imperial Romano-British rule: continuity in a Romanised land (p13) 1.2.3. Limited Roman influence and no Anglo-Saxon invasion: continuity from Iron Age Britain through to early medieval England (p15) 1.2.4. Development of archaeological techniques (p17) 1.2.5. Climate change and environmental determinism (p19) 1.2.6. Summary of the early Dark Ages (p21) 1.3. The later Dark Ages: Viking England (p22) 1.3.1. Why did the Vikings attack? (p23) 1.3.2. Norse settlement and the Danelaw (p25) 1.4. The Lake District: landscape and history (p26) 1.4.1. The prehistoric landscape (5000 BC – AD 69)1 (31) 1.4.2. The Romano-British period (approximately AD 69 – 410) (p35) 1.4.3. Dark Age/early medieval Lakeland (approximately AD 410 – 1066) (p38) 1.4.3.1. Rheged (p40) 1.4.3.2. Mid- to late-Anglo-Saxon and Norse Cumbria (c AD 700 – 1066) (p41) 1.4.4. The middle and later medieval periods (AD 1066 – 1485) (43) 1.4.5. Tudor and Stuart times (AD 1485 – 1714) (p45) 1.4.6. From the Georgian Age to the present day (AD 1714 – 2010) (p46) 1.4.7. Summary (p47) 1.5. Palaeoecology: establishing the environmental context (p48) 1.5.1. Determining vegetation patterns through pollen analysis (p48) 1.5.1.1. Pollen recruitment, source area and representativity (p49) 1.5.1.2. Pollen modelling and simulation: R-values and underlying assumptions (p50) 1.5.1.3. Extended R-values, Pollen Productivity Estimates (PPEs) and fall speeds (p51) 1.5.1.4. HUMPOL v3, the Landscape Reconstruction Algorithm (LRA) and the Multiple Scenario Approach (MSA) (54) 1.5.1.5. Differences between sampling basins (p56) 1.5.1.6. Differential preservation (p57) 1.5.2. Detecting agriculture and grazing within the pollen record (p60) 1.5.2.1. Cereal pollen (p61) 1.5.2.2. Indicator species for anthropogenic activity (p61) 1.5.3. Changes in sediment accumulation and composition (p67) 1.5.4. Diatom analysis in relation to land-use (p68) 1.5.4.1. Disentangling diatom ecology (p69) 1.6. Previous palaeoecological work in Cumbria (p70) 1.6.1. Palynological work in Cumbria: summary of previous studies (p70) 1 Dates are based on the oldest archaeological remains in the area (Mesolithic) and the earliest date for the Roman invasion of Northwest England respectively. 1.6.1.1. Prehistoric and Romano-British human impact in Cumbria and the Lake District (p76) 1.6.1.2. The Dark Age Cumbrian landscape (p82) 1.6.2. Diatom analysis in the Lake District (p86) 1.6.3. Summary and project aims (p87) Chapter 2: Methodology (pp89-98) 2.1. Site selection, preparation and field methods (p89) 2.1.1. Fieldwork methods (p90) 2.2. Laboratory methods (p91) 2.2.1. Sediment description (p91) 2.2.2. Loss on ignition (LOI) (p93) 2.2.3. Spheroidal Carbonaceous Particle (SCP) extraction and counting (p94) 2.2.4. Pollen extraction and counting (p94) 2.2.5. Diatom extraction and counting (p96) 2.2.6. Radiocarbon sampling (p97) Chapter 3: Study sites (pp99-136) 3.1. Selection of study sites (p99) 3.2. Barfield Tarn (BFT) (p100) 3.3. Blelham Tarn (BLT) (p105) 3.4. Burney Tarn (BYT) and Burney Bog (BYB) (p111) 3.5. Little Langdale Tarn (LLT) (p118) 3.6. Loughrigg Tarn (LGT) (p124) 3.7. Tewet Tarn (TWT) (p132) Chapter 4: Results (pp137-207) 4.1. Barfield Tarn (BFT) (p138) 4.1.1. Sediment description (p139) 4.1.2. Pollen analysis (p140) 4.1.3. Diatom analysis (p143) 4.1.4. Age estimation (p145) 4.2. Blelham Tarn (BLT) (p146) 4.2.1. Sediment description (p146) 4.2.2. Pollen analysis (p146) 4.2.3. Diatom analysis (p148) 4.2.4. Age estimation (p150) 4.3. Burney Tarn (BYT) and Burney Bog (BYB) (p150) 4.3.1. Sediment description (p151) 4.3.2. Pollen analysis (BYB only) (p151) 4.3.3. Diatom assessment (p153) 4.3.4. Age estimation (p154) 4.4. Little Langdale Tarn (LLT) (p154) 4.4.1. Sediment description (p155) 4.4.2. Pollen analysis (p155) 4.4.3. Diatom analysis (156) 4.4.4. Age estimation (p158) 4.5. Loughrigg Tarn (LGT) (p159) 4.5.1. Sediment description (p159) 4.5.2. Pollen analysis (p159) 4.5.3. Diatom analysis (p163) 4.5.4. Age estimation (p165) 4.6. Tewet Tarn (TWT) (p165) 4.6.1. Sediment description (p166) 4.6.2. Pollen analysis (p166) 4.6.3. Age estimation (p168) 4.7. Summary of results (p169) Chapter 5: Modelling and analysis (pp209-259) 5.1. Landscape simulation: parameters, settings and choice of software (p209) 5.2. Barfield Tarn: radiocarbon dating and evidence for inwash (p212) 5.2.1. Vegetation and landscape management in the post-Romano-British and Anglo-Saxon periods (c AD 430-850) (p217) 5.2.1.1. BFT_LPAZ 1 Pollen simulations (p217) 5.2.2. Vegetation and landscape management in the later Anglo-Saxon and Norse periods (c AD 850-1100) (p231) 5.2.2.1. BFT_LPAZ 2 Pollen simulations (p231) 5.3. Loughrigg Tarn: age-depth modelling (p237) 5.3.1. Vegetation and landscape management in the late- to post-Romano- British and early Anglo-Saxon periods (c AD 300-630) (p240) 5.3.1.1. LGT_LPAZ 3b Pollen simulations (p242) 5.3.2. Vegetation and landscape management in the Anglo-Saxon and Norse periods (c AD 630-1066 AD) (p251) 5.3.2.1. LGT_LPAZ 3c Pollen simulations (p251) Chapter 6: Discussion (pp261-282) 6.1. Summary of early medieval Barfield Tarn (p262) 6.2. Summary of early medieval Loughrigg Tarn (p264) 6.3. Early medieval Lakeland (p267) 6.4. Benefits and limitations of modelling and simulation techniques in pollen analysis (p274) 6.4.1.