Proceedings of the Geologists Association最新文献_第10页

A nautiloid with ventral bitemarks from the Charmouth Mudstone Formation (Lower Jurassic) near Lyme Regis, Dorset, UK 英国多塞特郡莱姆里吉斯附近Charmouth泥岩组（下侏罗纪）的一种带腹面bitemarks的鹦鹉螺

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.04.002

Paul Davis, Paddy Howe , Chris Paul, Heather Salmon

{"title":"A nautiloid with ventral bitemarks from the Charmouth Mudstone Formation (Lower Jurassic) near Lyme Regis, Dorset, UK","authors":"Paul Davis, Paddy Howe , Chris Paul, Heather Salmon","doi":"10.1016/j.pgeola.2023.04.002","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.04.002","url":null,"abstract":"<div>Locally within the Charmouth Mudstone Formation (Sinemurian, Lower Jurassic) of the Dorset coast fatally bitten ammonites with ventral bite marks are common. Ventral bite marks occur at the rear of the body-chamber. The predator probably severed attachment muscles, thus removing its prey more easily. We report the first ventrally bitten fossil nautiloid, which is unusual in that the large bite mark is entirely within the phragmocone. The nautiloid is juvenile with a very short body-chamber extending 46° back from the apparently undamaged aperture. The whorl cross-section is nearly circular, giving the predator little to grip when biting. Nautiloid shells are also thicker than ammonite shells. Despite these difficulties, the predator bit repeatedly and damaged both the shell and septa. Five rounded bites occur on the left side, separated by sharp points. This suggests the predator was probably another cephalopod with suckered arms and powerful jaws. The centre of the bite is 160.5° back from the aperture, close to the mean value for ammonites (184.5°), suggesting the predator located the position of the first bite opposite the victim's aperture. Thus, we think the predator attacked an incomplete nautiloid shell which explains why the damage affects only the phragmocone.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 3","pages":"Pages 322-328"},"PeriodicalIF":1.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49802346","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 Middle Ordovician (Darriwilian) faunas from the Sultanate of Oman 阿曼苏丹国中奥陶世新动物群

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.02.004

A.P. Heward , R.A. Fortey , C.G. Miller , G.A. Booth

{"title":"New Middle Ordovician (Darriwilian) faunas from the Sultanate of Oman","authors":"A.P. Heward , R.A. Fortey , C.G. Miller , G.A. Booth","doi":"10.1016/j.pgeola.2023.02.004","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.02.004","url":null,"abstract":"<div>New trilobite material and the first graptolites from outcrop are described from the Am5 member of the Amdeh Formation near Al Fleij in northeast Oman. The sediments in which these faunas occur are interpreted as distal-shelf deposits with storm beds packed with brachiopods and orthoconic nautiloids. The deposits and its faunas are considered of late Darriwilian age and younger than the shallower-water Am5 deposits known from other outcrops. No palynomorphs could be recovered to confirm this due to the increased burial temperature the Al Fleij area has experienced.The trilobites are of considerable palaeo-biogeographic interest as few faunas of this age are known from the Arabian Plate, though their preservation precludes the establishment of new species. They include Isabelinia aff. glabrata, Liomegalaspides sp., Neseuretus tristani, Neseuretinus sp. and the deeper-water forms, Cyclopyge cf. C. bohemica, Arthrorhachis sp. and Brachypleura sp. The graptolites are pendent Didymograptus spp. of later Darriwilian type.Rare elements of the conodonts Nordiora, Amorphognathus and Microzarkodina have been recovered from shell beds that occur interbedded with the faunas. They too indicate a late Darriwilian age and differ from richer, restricted, shallow-water faunas known from the Am5 at other locations, and the more cosmopolitan shelf fauna from the Ayim Member of the Rann Formation of the United Arab Emirates.A coarser, 80 m-thick, terrestrial sequence containing igneous pebbles, included in the Am5 in the 1980s, is shown from the occurrence of fossil plants to be of Permian age and probably equivalent to the Basal Saiq Clastics of Jabal al Akhdar.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 3","pages":"Pages 251-268"},"PeriodicalIF":1.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49845037","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 time-transgressive model for microstructures in subglacial tills - Examples from beneath the Late Wisconsinan (MI 2) Laurentide Ice Sheet 冰下山丘微观结构的时间海侵模型——来自晚威斯康辛州(MI 2)劳伦泰德冰盖的例子

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.05.005

J. Menzies, R. Paulen, J. Rice

引用次数: 0

A truly gigantic pliosaur (Reptilia, Sauropterygia) from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of England 一种来自英国Kimmeridge粘土组（上侏罗纪，Kimmeridgian）的真正巨大的上龙（爬行纲，Sauropterygia）

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.04.005

David M. Martill, Megan L. Jacobs, Roy E. Smith

{"title":"A truly gigantic pliosaur (Reptilia, Sauropterygia) from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of England","authors":"David M. Martill, Megan L. Jacobs, Roy E. Smith","doi":"10.1016/j.pgeola.2023.04.005","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.04.005","url":null,"abstract":"<div>Four isolated cervical vertebrae from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of Abingdon, Oxfordshire, England are identified as from a pliosaurid plesiosaurian sauropterygian on account of their shortness relative to width and height, their near platycoelous nature and the location of tall rib facets on the centrum body. They are noteworthy for their size, with a maximum width of 269 mm, maximum height of 222 mm and maximum length of 103 mm. Simple scaling and comparisons with cervical vertebrae of Mid Jurassic pliosaurs Peloneustes and Liopleurodon, and the Early Cretaceous Stenorhynchosaurus and Sachicasaurus suggest a total body length of between ~9.8 m and 14.4 m for the Abingdon Kimmeridge Clay pliosaur. Likely the true length was towards the higher end of this range.A genus and species cannot be confidently determined on the basis of the described material, but they likely belong to Pliosaurus sp. or a similar animal, for which a precise neck length is not known. We estimate a neck length of 0.77 m for Pliosaurus ?brachyspondylus based on the average cervical lengths provided for specimen CAMSM J.35991.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 3","pages":"Pages 361-373"},"PeriodicalIF":1.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49802853","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 new neoselachian shark from the marine Early Cretaceous of Southern England 英格兰南部白垩纪早期海洋中的一种新的新塞拉奇鲨鱼

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.03.003

Trevor J. Batchelor , Christopher J. Duffin

引用次数: 1

Ammonites and stratigraphy of the “Wild Bed” (Middle Jurassic, Aalenian, Inferior Oolite) at Quarr Hill, Chideock, Dorset 多塞特郡奇德克夸尔山“野生床”（侏罗纪中期、亚莱尼阶、下鲕粒岩）的亚氨岩和地层学

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.03.004

Robert B. Chandler , Volker Dietze , Rolf Chiarini , John Whicher

引用次数: 0

Distinctive azhdarchoid pterosaur jaws from the mid-Cretaceous Cambridge Greensand of eastern England and the Kem Kem Group of Morocco 英格兰东部剑桥-格林山白垩纪中期和摩洛哥凯姆-凯姆群的独特阿兹达乔翼龙颌

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.03.002

Roy E. Smith , David M. Martill , Samir Zouhri

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 : 2023-06-01 DOI: 10.1016/j.pgeola.2023.05.002

B. Lovell, H. Bailey, A. Farrant, L. Gallagher, Chris C. Green, J. Huggett, Russell Parkins, Jane Tubb

引用次数: 0

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-04-01 DOI: 10.1016/j.pgeola.2022.12.004

Hywel Griffiths

引用次数: 0

The condition, use and future of the UK's largest accessible dinosaur tracksite at Spyway Quarry, Dorset 位于多塞特郡Spyway Quarry的英国最大的无障碍恐龙足迹的状况、用途和未来

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-04-01 DOI: 10.1016/j.pgeola.2023.01.001

Kirsty M. Edgar , Luke E. Meade , Harry T. Jones , Lewis Haller , Sam Scriven , Christopher Reedman , Richard J. Butler

{"title":"The condition, use and future of the UK's largest accessible dinosaur tracksite at Spyway Quarry, Dorset","authors":"Kirsty M. Edgar , Luke E. Meade , Harry T. Jones , Lewis Haller , Sam Scriven , Christopher Reedman , Richard J. Butler","doi":"10.1016/j.pgeola.2023.01.001","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.01.001","url":null,"abstract":"<div>Spyway Quarry in Dorset contains >100 tracks made by large sauropod dinosaurs walking across what was a shelly beach in the Early Cretaceous. It is the largest in situ easily accessible UK dinosaur tracksite, a unique location for the public to directly engage with dinosaurs. Following consultation on how best to open and manage the site considering its 'value', longevity, and resources available, it was left unstaffed with the track surface directly accessible. The site has been open to the elements since 2013 and to the public since 2016. We created a new photogrammetric model of the site in 2021, for comparison with an existing 2014 model to identify any changes in the trackway surface and to assess the sustainability of direct public access and weathering to the surface. To understand public use of the site, we installed a visitor counter, compiled social media reviews, and analysed photographs of visitor's movement on the quarry surface. We provide quantitative evidence for exfoliation of the track surface and reduction in the prominence of individual tracks over time primarily due to natural processes. Visitor data suggest ~10,000 people visit annually, and feedback suggests potential improvements to visitor directions and information. We do not recommend substantial changes to the site management plan given resource constraints. Our work highlights the importance of using 3D imaging techniques to document sites upon discovery and thereafter and making these data openly available to all for conservation monitoring, communication and to preserve sites' legacies.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 2","pages":"Pages 125-138"},"PeriodicalIF":1.2,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49795833","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