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

Excavating the ‘Rutland Sea Dragon’: The largest ichthyosaur skeleton ever found in the UK (Whitby Mudstone Formation, Toarcian, Lower Jurassic) 挖掘“拉特兰海龙”:在英国发现的最大的鱼龙骨架(惠特比泥岩组，托瓦西亚，下侏罗纪)

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.09.003

Nigel R. Larkin , Dean R. Lomax , Mark Evans , Emma Nicholls , Steven Dey , Ian Boomer , Philip Copestake , Paul Bown , James B. Riding , Darren Withers , Joseph Davis

{"title":"Excavating the ‘Rutland Sea Dragon’: The largest ichthyosaur skeleton ever found in the UK (Whitby Mudstone Formation, Toarcian, Lower Jurassic)","authors":"Nigel R. Larkin , Dean R. Lomax , Mark Evans , Emma Nicholls , Steven Dey , Ian Boomer , Philip Copestake , Paul Bown , James B. Riding , Darren Withers , Joseph Davis","doi":"10.1016/j.pgeola.2023.09.003","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.09.003","url":null,"abstract":"<div>An almost complete ichthyosaur skeleton 10 m long was discovered in January 2021 at the Rutland Water Nature Reserve in the county of Rutland, UK. This was excavated by a small team of palaeontologists in the summer of the same year. Nicknamed ‘The Rutland Sea Dragon’, this almost fully articulated skeleton is an example of the large-bodied Early Jurassic ichthyosaur Temnodontosaurus. The specimen was analysed in situ, recorded (including a 3D scan using photogrammetry), excavated and removed from the site in a series of large plaster field jackets to preserve taphonomic information. Significantly, the specimen is the largest ichthyosaur skeleton to have been found in the UK and it may be the first recorded example of Temnodontosaurus trigonodon to be found in the country, extending its known geographic range significantly. It also represents the most complete skeleton of a large prehistoric reptile to have been found in the UK. We provide an account of the discovery and describe the methods used for excavating, recording and lifting the large skeleton which will aid palaeontologists facing similar challenges when collecting extensive remains of large and fragile fossil vertebrates. We also discuss the preliminary research findings and the global impact this discovery has had through public engagement.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 5","pages":"Pages 627-640"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71771460","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 fossil record's oldest known calculus (an enterolith of the gastrointestinal tract), from the Kimmeridge Clay Formation (Upper Jurassic), UK 化石记录中已知最古老的结石(胃肠道的肠石)，来自英国的上侏罗统Kimmeridge粘土组

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.05.004

Nigel R. Larkin , Thomas Henton , Steve Etches , Adrian J. Wright , Tzu-Yu Chen , Laura L. Driscoll , Richard M. Shelton , Ivan J. Sansom

{"title":"The fossil record's oldest known calculus (an enterolith of the gastrointestinal tract), from the Kimmeridge Clay Formation (Upper Jurassic), UK","authors":"Nigel R. Larkin , Thomas Henton , Steve Etches , Adrian J. Wright , Tzu-Yu Chen , Laura L. Driscoll , Richard M. Shelton , Ivan J. Sansom","doi":"10.1016/j.pgeola.2023.05.004","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.05.004","url":null,"abstract":"<div>A calculus is a solid mineral concretion such as a kidney stone, bladder stone, gall stone or stomach stone that forms naturally in a body under certain dietary or environmental conditions. Calculi that form in the gastrointestinal tract are enteroliths and these are often near-spherical objects, sometimes with a hollow centre, with a concentrically layered structure composed of radiating crystals oriented perpendicular to the surface. They are known in the archaeological record but are almost entirely absent from the fossil record, most likely due to them simply not being recognised for what they are. We describe a fossil calculus from the Upper Kimmeridge Clay (Upper Jurassic, c., 150 million years old) marine deposit at Kimmeridge in Dorset, UK. This is the oldest calculus known from the fossil record with previous confirmed records from the terrestrial Oligocene of Colorado and the marine Upper Cretaceous Chalk of Germany: it extends the temporal range of known calculi in the fossil record by at least 59 million years. Although there are a wide range of potential hosts, the Kimmeridge calculus may have been produced by a large marine reptile.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 5","pages":"Pages 526-532"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71771404","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

New exposure of the Cretaceous–Paleogene unconformity and Paleocene–Eocene pebble bed in the Paleogene outlier at Collier's End, Hertfordshire, UK 英国哈福德郡Collier's End古近系异常区白垩系-古近系不整合面和古新世-始新世卵石层新暴露

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.05.002

Bryan Lovell , Haydon Bailey , Andrew R. Farrant , Liam Gallagher , Chris Green , Jennifer Huggett , Russell Parkins , Jane Tubb

{"title":"New exposure of the Cretaceous–Paleogene unconformity and Paleocene–Eocene pebble bed in the Paleogene outlier at Collier's End, Hertfordshire, UK","authors":"Bryan Lovell , Haydon Bailey , Andrew R. Farrant , Liam Gallagher , Chris Green , Jennifer Huggett , Russell Parkins , Jane Tubb","doi":"10.1016/j.pgeola.2023.05.002","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.05.002","url":null,"abstract":"<div>The Paleogene outlier at Collier's End, Hertfordshire lies on the northern rim of the London Basin. This small outlier has archaeological and geological significance. Silica-cemented concretions of Hertfordshire Puddingstone lie within a regionally mappable pebble bed. The first discovery of a Roman quarry to recover puddingstone for manufacture of querns was made in the outlier. A rare complete section from the Chalk Group up through the Paleogene was temporarily exposed in 2021 and is recorded here. The Paleogene shows features that may be associated with the Paleocene–Eocene Thermal Maximum (PETM). The chalk in the new exposure is Late Coniacian. This age provides further evidence of relatively deep erosion of the chalk in this area, as erosion of chalk at the crest of a regional dome preceded advances and retreats of the western shore of the Paleogene North Sea. These events may be linked to the early development of the Icelandic mantle plume.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 5","pages":"Pages 503-516"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71771406","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

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.05.001

Stephen Tooth

引用次数: 0

Simon Richard Appleton Kelly (1949–2023) 西蒙·理查德·阿普尔顿·凯利(1949-2023)

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-10-01 DOI: 10.1016/j.pgeola.2023.09.002

Simon Schneider, Michael A. Pointon

引用次数: 0

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