Proceedings of the Geologists Association最新文献_第7页

Cosmogenic (10Be) surface-exposure ages from the Burtness Comb rock avalanche, Lake District, northwest England 英国西北部湖区Burtness Comb岩崩的宇宙成因(10Be)地表暴露年龄

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.09.001

Peter Wilson , David Jarman , Maria Miguens-Rodriguez , Derek Fabel

{"title":"Cosmogenic (10Be) surface-exposure ages from the Burtness Comb rock avalanche, Lake District, northwest England","authors":"Peter Wilson , David Jarman , Maria Miguens-Rodriguez , Derek Fabel","doi":"10.1016/j.pgeola.2023.09.001","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.09.001","url":null,"abstract":"<div>The age of the lower component of the Burtness Comb rock avalanche debris tongue, Lake District, northwest England, has been determined by in situ produced terrestrial cosmogenic (10Be) surface-exposure dating of quartz veins from three boulders. Uncertainty-weighted mean ages of 17.37 ± 0.94 ka (determined using the Loch Lomond calibration dataset) and 16.08 ± 1.25 ka (determined using the CRONUS-Earth default calibration dataset) indicate that this component of the rock avalanche occurred during deglaciation following the local Last Glacial Maximum. The surface morphology displayed by the debris indicates it likely accumulated on glacier-free terrain, suggesting that the Burtness Comb cirque glacier had decoupled from the Buttermere valley glacier at the time of debris emplacement. The debris may have travelled across the surface of a waning glacier in the upper part of the cirque. Although the upper component of the rock avalanche is as yet undated its position and configuration indicate it to be younger than the lower component and sourced from a different part of the comb headwall. The rock avalanche is only the third of 84 rock slope failures recognised in the Lake District and adjacent Howgill Fells to have been dated using 10Be. Whilst the rock avalanche is regarded as a paraglacial landform, additional ages on other members of this population are required in order to establish their temporal pattern and to propose the most probable underlying cause(s) of failure.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 5","pages":"Pages 619-626"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71771461","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

A marine microvertebrate fauna from a temporary exposure of the Atherfield Clay Formation, Reigate, Surrey 萨里郡雷盖特阿瑟菲尔德粘土地层临时暴露的海洋微脊椎动物动物群

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.08.001

Trevor J. Batchelor , Christopher J. Duffin

{"title":"A marine microvertebrate fauna from a temporary exposure of the Atherfield Clay Formation, Reigate, Surrey","authors":"Trevor J. Batchelor , Christopher J. Duffin","doi":"10.1016/j.pgeola.2023.08.001","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.08.001","url":null,"abstract":"<div>A temporary exposure of the nearshore marine Atherfield Clay (Lower Greensand Formation, Aptian, Early Cretaceous) in the Reigate area (Wonham Mill) of Surrey was sampled for microvertebrate remains in Autumn 2013. Samples amounting to 858 kg of sediment were washed, dried, and sieved to 0.325 mm and the residue searched for all fossil content. This is the first definitive study of the Atherfield Clay chondrichthyan fauna of Surrey. The samples yielded teeth of hybodont sharks (Planohybodus ensis, Lonchidion breve), neoselachian sharks (Heterodontus sulcatus, Cretascyllium hassei, Protospinax sp., Protolamna sokolovi, Lamnid indet., Scyliorhinus muelleri, Scyliorhinus gen. et sp. indet., Protoscyliorhinus sp.) and batoids (Belemnobatis picteti, Squatirhina sp.). The neoselachian sharks and rays all constitute the first confident records for the various genera in the Atherfield Clay of the United Kingdom. Dermal denticles and bony fish teeth are also present in the samples, which also yielded small numbers of invertebrates (ammonite and crustacean), microcoprolites (Tomaculopsis tomaculopsis) and plant remains (fern indusia). The state of preservation of the chondrichthyan material suggests that none of the specimens are derived from older strata; the fauna is indigenous. The Surrey Atherfield Clay fauna is distinct from that recorded from the Atherfield Bone Bed on the Isle of Wight and the roughly coeval boreal fauna of the Speeton Clay.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 5","pages":"Pages 599-618"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71771463","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

Terrestrial carbon isotope stratigraphy of the Eocene–Oligocene transition, Petrockstowe and Bovey basins, Devon, UK 英国德文郡Petrockstowe和Bovey盆地始新世-渐新世过渡的陆相碳同位素地层学

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.05.003

Mohammed S. Chaanda , Stephen T. Grimes , Rhodri M. Jerrett , Mark Anderson , Melanie J. Leng , Meriel E. Fitzpatrick , Gregory D. Price

{"title":"Terrestrial carbon isotope stratigraphy of the Eocene–Oligocene transition, Petrockstowe and Bovey basins, Devon, UK","authors":"Mohammed S. Chaanda , Stephen T. Grimes , Rhodri M. Jerrett , Mark Anderson , Melanie J. Leng , Meriel E. Fitzpatrick , Gregory D. Price","doi":"10.1016/j.pgeola.2023.05.003","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.05.003","url":null,"abstract":"<div>The terrestrial sediments of the Petrockstowe and Bovey basins in Devon, UK were examined. Their age is considered to be Eocene and Oligocene. The sediments (kaolinitic clays, silts, sands, gravels, and lignites) from both basins were analysed for carbon isotopes of organic material, in conjunction with total organic carbon and palynological analyses used to unravel the type of and provenance of organic matter present. Within the Petrockstowe Basin, the lowermost interval examined shows a palynological distribution dominated by phytoclasts, whilst the upper part of the core is dominated by higher concentrations of palynomorphs (up to 90 %) and an increase in amorphous organic matter consistent (up to 37 %) with a change from sand-filled fluvial channels followed by an ephemeral lake or lake margin setting. Our palynological data from the South John Acres Lane Quarry section, Bovey Basin, show that within the lignites palynomorphs are high again (up to 95 %) consistent with them representing more ephemeral lakes or lake margins periodically exposed with mires. Our palynological data set further allows us to determine that isotope trends are not overly determined by the source of carbon in the basins. Our study suggests that the observed patterns were primarily produced by variations of the isotope ratios of terrestrial atmospheric carbon reservoirs. Even with our less than well constrained biostratigraphical control, the data indicate that the carbon isotope excursions seen in the Eocene and Oligocene could be associated with several transient carbon isotopic shifts (associated with the Paleocene–Eocene Thermal Maximum). Our findings therefore appear to lend support to the surface ocean and atmosphere behaving as coupled reservoirs at this time.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 5","pages":"Pages 517-525"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71771405","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

First record of the trace fossil Renichnus arcuatus Mayoral, 1987 in the Pliocene of Sidi Brahim (Lower Chelif Basin, NW Algeria) 西迪布拉希姆(阿尔及利亚西北部下切里夫盆地)上新世首次记录的arcuatus Renichnus Mayoral化石

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.06.001

Rachid Khalili , Olev Vinn

引用次数: 0

The Carnian Pluvial Episode: A damp squib for life on land? 卡尼洪积期:陆地生命的湿炮?

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.07.002

Robert A. Coram , Jonathan D. Radley

引用次数: 0

The Kula–Salihli UNESCO Geopark: Spectacular records of Quaternary volcanism, fluvial and landscape evolution and Quaternary environmental change 联合国教科文组织库拉-萨利赫里地质公园:第四纪火山活动、河流和景观演变以及第四纪环境变化的壮观记录

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-08-01 DOI: 10.1016/j.pgeola.2022.06.008

Ahmet Serdar Aytaç , Tuncer Demir , Darrel Maddy , David R. Bridgland

{"title":"The Kula–Salihli UNESCO Geopark: Spectacular records of Quaternary volcanism, fluvial and landscape evolution and Quaternary environmental change","authors":"Ahmet Serdar Aytaç , Tuncer Demir , Darrel Maddy , David R. Bridgland","doi":"10.1016/j.pgeola.2022.06.008","DOIUrl":"https://doi.org/10.1016/j.pgeola.2022.06.008","url":null,"abstract":"<div>The Kula–Salihli UNESCO Geopark, western Turkey, is a tectonically and volcanically active region in which the most recent eruptions of basaltic lava, associated with scoria cone formation, were during the latest Pleistocene and the Holocene. Much older volcanism within the same volcanic province is also in evidence, with some of the older lavas capping mesa-style uplands, such that they have preserved underlying poorly consolidated sediments that would otherwise have been lost to erosion. Beneath these hill-capping lavas, above the Neogene sediments representing endorheic basin-fill, are the early gravels of the River Gediz system, forming narrowly separated terraces (separation by a few metres) thought to have been formed in response to the ~ 41 kyrs obliquity-driven climate cycles of the Early Pleistocene. The rarity of terrace preservation from this early part of the Quaternary makes this a very valuable part of the geopark, in which there is also evidence for the progressive incision into the landscape, and for periodic damming of the river system by lava eruptions, bringing about lacustrine phases that can be recognized from lake sediments and deltas that were built into the former lakes. The combination of volcanic and drainage evolutionary evidence has few if any parallels elsewhere. The geopark, which also contains sites of archaeological and historical importance, is managed sustainably in order to maximize its educational, economic, touristic and heritage value.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 4","pages":"Pages 416-431"},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49864451","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: 2

A marine microvertebrate fauna from a temporary exposure of the Atherfield Clay Formation, Reigate, Surrey 萨里郡雷盖特阿瑟菲尔德粘土地层临时暴露的海洋微脊椎动物动物群

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-08-01 DOI: 10.1016/j.pgeola.2023.08.001

Trevor J. Batchelor, C. Duffin

引用次数: 0

The value of English geoconservation sites in understanding historical collections of lower and middle palaeolithic artefacts 英国地质保护遗址在了解旧石器时代中下部文物的历史收藏中的价值

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-08-01 DOI: 10.1016/j.pgeola.2021.06.008

L.C. Dale , A.A. Rawlinson , D.R. Bridgland , M.J. White

{"title":"The value of English geoconservation sites in understanding historical collections of lower and middle palaeolithic artefacts","authors":"L.C. Dale , A.A. Rawlinson , D.R. Bridgland , M.J. White","doi":"10.1016/j.pgeola.2021.06.008","DOIUrl":"https://doi.org/10.1016/j.pgeola.2021.06.008","url":null,"abstract":"<div>Lower and Middle Paleolithic archaeological sites in England risk falling through the cracks between different types of heritage conservation, since they lack recognisable structures; these sites have often benefitted from protection under geoconservation, particularly through selection as Geological Conservation Review sites, and subsequent designation as Sites of Special Scientific Interest (SSSIs). The geoconservation of key sites, particularly in the formative years of British geoconservation, has allowed combined geological and archaeological reinvestigation. This is of particular benefit to understanding Lower and Middle Paleolithic artefact assemblages, which were often collected in the later 19th–earlier 20th century and consequently lacked both detailed spatial or stratigraphic provenance and contextual geological information. As such, the ‘fine grained’ data which could be gleaned from such artefact collections was limited. Here we review the benefit of geoconservation in allowing the contextualisation of historical archaeological collections, focussing on six key English sites where geological and archaeological reinvestigation has led to important archaeological findings. In particular, the emerging evidence of chronological patterning in Lower and Middle Paleolithic artefacts makes the preservation of such deposits valuable to Quaternary science in general.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 4","pages":"Pages 388-402"},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pgeola.2021.06.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49864448","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: 3

A diverse trace-fossil assemblage from the Middle Jurassic (Bajocian) Teniet El Klakh Formation (western Saharan Atlas, Algeria) 来自中侏罗世(巴约西亚)Teniet El Klakh组(阿尔及利亚西撒哈拉地图集)的多种化石组合

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-08-01 DOI: 10.1016/j.pgeola.2023.07.006

Fayçal Mekki, Imad Bouchemla, Mohammed Adaci, S. Talmat, B. Ferré, M. Benyoucef

引用次数: 1

Conserving Quaternary geoheritage in Northern Ireland 保护北爱尔兰的第四纪地质遗产

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-08-01 DOI: 10.1016/j.pgeola.2022.07.005

Michael Dempster , Ian J. Enlander

{"title":"Conserving Quaternary geoheritage in Northern Ireland","authors":"Michael Dempster , Ian J. Enlander","doi":"10.1016/j.pgeola.2022.07.005","DOIUrl":"https://doi.org/10.1016/j.pgeola.2022.07.005","url":null,"abstract":"<div>Northern Ireland has a rich and varied Quaternary geoheritage. Landforms and sediments from the last glacial phase of the Late Pleistocene are most prevalent, though the record extends from the last interglacial (MIS 5e) to the Holocene. The glacial record in the region continues to play a crucial role in the development of models of the last British-Irish Ice Sheet, with many sites having international significance. It is the role of the Northern Ireland Environment Agency to legally protect and conserve this important Quaternary heritage, and a programme of statutory designation of these sites as Areas of Special Scientific Interest (ASSIs) has been in place for over twenty years. ASSIs are selected from the Pleistocene and Holocene themes of the Earth Science Conservation Review, the process through which geological sites in Northern Ireland are assessed to determine their importance to science, and so to geoconservation. This produced a significant series of reports that have contributed much to the grey and white literature for the Quaternary in the United Kingdom and Ireland. Quaternary geoheritage is recognised in the local planning system and existing and potential UNESCO Global Geoparks further serve to promote and protect this aspect of Northern Ireland's natural heritage. This paper summarises the Quaternary history of Northern Ireland, how ASSIs are selected to reflect this and how they are monitored and managed. It also considers how to ensure continued protection and recognition for Quaternary sites and features in the region.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 4","pages":"Pages 432-448"},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49864452","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: 2