Proceedings of the Geologists Association最新文献

Quaternary sea level landforms and sediments in southern England: Description of Geological Conservation Review sites 英格兰南部第四纪海平面地貌和沉积物:地质保护评审地点描述

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-02-01 DOI: 10.1016/j.pgeola.2022.06.004

Rebecca M. Briant , B. Andrew Haggart , Danielle C. Schreve , Colin A. Whiteman

引用次数: 0

Periglacial landforms and landscape development in southern England 英格兰南部的冰川地貌和景观发展

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-02-01 DOI: 10.1016/j.pgeola.2024.04.006

Colin A. Whiteman

{"title":"Periglacial landforms and landscape development in southern England","authors":"Colin A. Whiteman","doi":"10.1016/j.pgeola.2024.04.006","DOIUrl":"10.1016/j.pgeola.2024.04.006","url":null,"abstract":"<div><div><span>The south-central and south-east England Geological Conservation Review region is unique in Britain in lying completely outside the margins of Quaternary ice sheets. In view of this, the area has been described as a ‘relict periglacial landscape’. This implies that the region has evolved its current form substantially under the influence of seasonal and/or perennial frost. In fact, modern research has demonstrated that permafrost, either continuous or discontinuous, likely existed across probably the whole of the region at different times during the Quaternary. This has important implications for ground permeability and the strength of sediments and soils and this has, without doubt, influenced landscape development. Whilst the whole region appears to have experienced cold environmental conditions, the landforms, structures and sediments of some sites are particularly associated with </span>periglacial processes<span>. Allington Quarry, Spot Lane Quarry, Oaken Wood, Chiddingly Wood (known locally as Chiddinglye Wood), High Rocks and Rusthall Common have exhibited typical cambering structures with open or closed gulls. The latter three sites also display a fine range of surface weathering features. Hubbard's Hill is characterised by solifluction and active-layer detachment slides and associated subsurface shear structures, whilst the sarsen trains at Fyfield Down and Valley of Stones are also attributed to solifluction processes. Birling Gap and Pegwell Bay exhibit spectacular sediment brecciation and involutions. Pegwell Bay is also known for its thick layer of periglacial loess, a sediment that is also a feature of North Cliff, Broadstairs. Unfortunately, the dating of these landscape features has, so far, proved possible only at Hubbard's Hill and Pegwell Bay. Nevertheless, the sites reviewed here provide exceptional, and in some cases internationally important, indications of landscape development in cold, often permafrost, environments which justifies their status as GCR sites.</span></div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 1","pages":"Article 101059"},"PeriodicalIF":1.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141053454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Introduction to the Quaternary of southern England Geological Conservation Review sites

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-02-01 DOI: 10.1016/j.pgeola.2024.08.006

Rebecca M. Briant , Colin A. Whiteman , B. Andrew Haggart

引用次数: 0

Chalk Landforms of Southern England and Quaternary Landscape Development 英国南部白垩地貌与第四纪景观发展

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-02-01 DOI: 10.1016/j.pgeola.2018.05.002

Colin A. Whiteman , B. Andrew Haggart

{"title":"Chalk Landforms of Southern England and Quaternary Landscape Development","authors":"Colin A. Whiteman , B. Andrew Haggart","doi":"10.1016/j.pgeola.2018.05.002","DOIUrl":"10.1016/j.pgeola.2018.05.002","url":null,"abstract":"<div><div><span>The Chalklands are conspicuous in the landscape of the south-central and south-eastern England GCR region, especially the prominent escarpments of the North and South Downs and the extensive upland of Salisbury Plain. One of the most obvious features of Chalk landscape is the dense distribution of dry valleys which characterise both its dip and scarp slopes. Two groups of dry-valley sites are considered here, a morphology group (Bratton, Devil’s Dyke, and Rake Bottom), and a group noted for its sediments (Asham Quarry, Cow Gap, Devil’s Kneadingtrough, Holywell Coombe and Upper Halling). The morphology of the valleys considered in the first group, is spectacular. Each of these GCR sites is apparently associated with river capture. They display a complex morphology involving breaks of slope, sharply angular courses and, apparently, entrenched springs. Devil’s Dyke and Rake Bottom possess generally smooth slopes in contrast to the Bratton site where the slopes are incised by a wide range of channels. The formation of these valleys has attracted considerable controversy, mainly concerning the degree to which periglacial conditions, rather than ‘normal’, temperate fluvial conditions, are involved. The second group of Chalkland GCR sites is associated with relatively simple valleys or embayments in which natural or artificial exposures have revealed complex sediments that provided detailed environmental information, mainly from molluscan remains, but also from pollen and coleoptera in the case of the spectacular Holywell Coombe. Human artefacts were retrieved from Cow Gap, Devil’s Kneadingtrough and Holywell Coombe. At each site except perhaps Upper Halling where the record may extend back to the Mid-Devensian, the period represented by the sediments is late </span>Devensian<span> to Holocene<span> time, according to conventional and AMS radiocarbon dating.</span></span></div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 1","pages":"Article 100692"},"PeriodicalIF":1.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87737083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quaternary rivers, tufas and mires of southern England: Description of Geological Conservation Review sites

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-02-01 DOI: 10.1016/j.pgeola.2024.10.002

Rebecca M. Briant , Colin A. Whiteman , B. Andrew Haggart , David R. Bridgland , Ella Egberts , Michael J. Grant , Marcus Hatch , Peter G. Knowles , Danielle C. Schreve , Philip S. Toms , Francis F. Wenban-Smith , Mark J. White

{"title":"Quaternary rivers, tufas and mires of southern England: Description of Geological Conservation Review sites","authors":"Rebecca M. Briant , Colin A. Whiteman , B. Andrew Haggart , David R. Bridgland , Ella Egberts , Michael J. Grant , Marcus Hatch , Peter G. Knowles , Danielle C. Schreve , Philip S. Toms , Francis F. Wenban-Smith , Mark J. White","doi":"10.1016/j.pgeola.2024.10.002","DOIUrl":"10.1016/j.pgeola.2024.10.002","url":null,"abstract":"<div><div>Southern England contains a wealth of sites, reviewed here, that contain evidence for past deposition in freshwater environments over a period of over 0.5 million years and have been designated as Geological Conservation Review sites for their representativeness of a range of such environments. They include nine sites from two complete terrace sequences (the Solent in Hampshire [Solent Cliffs West, Calshot Cliffs, Hillhead Cliffs, Dunbridge Pit, Wood Green Gravel Pit] and Stour in Kent [Fordwich Pit, Sturry Gravel Pits, Wear Farm Pit, Chislet, Bishopstone to Reculver Cliffs]), alongside a further fluvial gravel site at Aylesford, in the valley of the Medway in Kent. Sites from the Thames catchment, although geographically nearby, are not included, having been previously described by Bridgland (1994). Many of these sites contain abundant Palaeolithic artefacts and some also fossils of multiple groups. A further four sites record fluvial landforms (Mole Gap, Surrey) and ancient ‘high-level gravels’ that may relate to very Early Pleistocene river activity (Upper Common, Mountain Wood, Upper Hale). Tufa and mire sites are relatively rare in this region, making those which are preserved more significant. The tufa sites at Blashenwell Farm and Wateringbury provide context for adjacent archaeological sites and record landscape development in the early and mid Holocene. The mire deposits at Cranes Moor, Mark Ash Wood, Cothill Fen and Rimsmoor together record vegetation history from key regional ecosystems for the entirety of the Holocene.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 1","pages":"Article 101084"},"PeriodicalIF":1.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A detailed investigation into the legacy of glacial readvances and ice-dammed lakes around Sellafield, West Cumbria: Implications for 3D modelling, hydrogeology and ground engineering

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.11.001

Jon W. Merritt , Nicholas T. Smith , Emrys Phillips , Clive A. Auton

{"title":"A detailed investigation into the legacy of glacial readvances and ice-dammed lakes around Sellafield, West Cumbria: Implications for 3D modelling, hydrogeology and ground engineering","authors":"Jon W. Merritt , Nicholas T. Smith , Emrys Phillips , Clive A. Auton","doi":"10.1016/j.pgeola.2024.11.001","DOIUrl":"10.1016/j.pgeola.2024.11.001","url":null,"abstract":"<div><div>The glacial evolution of western Cumbria, England is reassessed following a comprehensive review of both published and extensive unpublished records from the Sellafield area, together with targeted fieldwork. The exercise scrutinises evidence for glacial readvances across former ice-dammed lakes, determining their occurrence, relative age, extent and legacy. It is concluded that the area was affected by at least two substantial glacial readvances following the maximum build-up of ice during the last, Late Devensian (Weichselian/Wisconsin) glaciation. The earlier Gosforth Oscillation involved locally sourced ice together with ice that circulated around the north of the Lake District into the Irish Sea basin whilst most of the region was substantially glaciated. The subsequent Fishgarth Wood Readvance involved ice flowing from the north, but when an ice centre positioned over the western Southern Uplands of Scotland had become dominant. Glacial oscillations across the coastal plain have resulted in a complex interdigitating sequence of sediments of contrasting permeability and physical properties, commonly preserved within buried valleys. The genesis of some thin units of clay-rich diamicton and pebbly clay previously interpreted as till is discussed in the light of ongoing debate concerning their possible glaciolacustrine origin.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 6","pages":"Pages 695-743"},"PeriodicalIF":1.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The aberrant crinoid Cyathidium (Echinodermata, Crinoidea, Cyrtocrinida) from lower Campanian phosphatic chalk in West Sussex (UK) and Picardie (France) 英国西萨塞克斯郡和法国皮卡迪省下坎帕尼亚期磷化白垩中的异常棘皮动物Cyathidium（棘皮动物门，Crinoidea，Cyrtocrinida

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.07.001

Andy S. Gale , John W.M. Jagt

引用次数: 0

A new sun star (Echinodermata, Asteroidea, Solasteridae) from the mid-Miocene of Lacoste, France

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.10.001

Andrew S. Gale , David J. Ward

引用次数: 0

A large pterosaur from the Middle Jurassic (lower Bajocian) of Rutland, United Kingdom

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.09.003

Darren Withers , David M. Martill , Roy E. Smith , Michael Ashton , Anusuya Chinsamy , Charles Wood , Richard Forrest

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Enigmatic trace fossil from the Middle Jurassic Ravenscar Group of Yorkshire, England

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-12-01 DOI: 10.1016/j.pgeola.2024.09.004

David M. Martill , Danielle Milbank , Mike Romano , Roy E. Smith

引用次数: 0