Proceedings of the Geologists Association最新文献_第5页

Sauropod manus and pes prints with impressions of integument from the Ravenscar Group (Middle Jurassic) of Whitby, Yorkshire, England 英国约克郡惠特比 Ravenscar 组（中侏罗世）出土的长脚类动物的颚和趾指纹及外皮印模

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-04-01 DOI: 10.1016/j.pgeola.2024.02.003

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

引用次数: 0

New dragonflies from the Upper Eocene of the Isle of Wight, UK (Odonata: Anisoptera) 英国怀特岛上始新世的新蜻蜓（蜻蜓目：鞘翅目）

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-04-01 DOI: 10.1016/j.pgeola.2023.11.006

André Nel , Andrew J. Ross

引用次数: 0

Diverse Lophoctenium burrows from the Upper Devonian (Famennian V and VI) of Algeria 阿尔及利亚上泥盆纪（法门五世和六世）的多种 Lophoctenium 洞穴

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.12.001

Olev Vinn , Mohamed Bendella , Mansour Zaagane , Abdelmalik Draoui , Radouane Sadji , Ommar Mouzti

{"title":"Diverse Lophoctenium burrows from the Upper Devonian (Famennian V and VI) of Algeria","authors":"Olev Vinn , Mohamed Bendella , Mansour Zaagane , Abdelmalik Draoui , Radouane Sadji , Ommar Mouzti","doi":"10.1016/j.pgeola.2023.12.001","DOIUrl":"10.1016/j.pgeola.2023.12.001","url":null,"abstract":"<div>Three ichnospecies of Lophoctenium (L. comosum, L. richteri and L. cf. haudimmineri) are reported from the Upper Devonian Argiles de Marhouma Formation (southwestern Algeria) for the first time. This formation contains a diverse assemblage of trace fossils belonging to the Nereites ichnofacies. We describe three ichnospecies of Lophoctenium that correspond to three different feeding strategies among the diverse ichnofauna of the Argiles de Marhouma Formation. The strategy of L. comosum evidences food-rich sediments as it maximises the amount of collected food per foraged distance. The strategy of L. richteri is probably most efficient for feeding in slightly less nutrient rich sediment, but gives the opportunity to discover more prolific feeding sites by moving on longer distances. The strategy with a straight central burrow and probes on both sides of the main burrow with long interspaces (L. cf. haudimmineri) was presumably used in the least food rich sediment. It seems that the Lophoctenium was widespread in the Devonian, but restricted to seas surrounding Gondwana.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 1","pages":"Pages 97-104"},"PeriodicalIF":1.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055786","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

Elephant seismicity: Ichnological and rock art perspectives from South Africa 大象地震：南非的技术和岩画视角

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.09.006

Charles W. Helm , Andrew S. Carr , Hayley C. Cawthra , Jan C. De Vynck , Mark G. Dixon , Andrew Paterson , Renee Rust , Willo Stear , Guy Thesen , Fred Van Berkel , Monique Van Tonder

{"title":"Elephant seismicity: Ichnological and rock art perspectives from South Africa","authors":"Charles W. Helm , Andrew S. Carr , Hayley C. Cawthra , Jan C. De Vynck , Mark G. Dixon , Andrew Paterson , Renee Rust , Willo Stear , Guy Thesen , Fred Van Berkel , Monique Van Tonder","doi":"10.1016/j.pgeola.2023.09.006","DOIUrl":"10.1016/j.pgeola.2023.09.006","url":null,"abstract":"<div>An association between round or oval features and linear features has been noted in South African Pleistocene coastal deposits, in apparent association with elephant tracks. The round or oval features sometimes exhibit concentric rings, and the latter often comprise near-parallel grooves and ridges. In one case the concentric rings and parallel grooves are closely connected. Such an association requires interpretation, even if this remains hypothetical until further sites are identified. Elephants are the heaviest extant land mammals, and their capacity to impart substantial forces onto the substrates on which they tread is well documented. Such forces include a seismic component, and seismic communication between elephants has received considerable attention in recent decades. Comparisons with dinosaur tracks are instructive in interpreting the available ichnological evidence. In the absence of plausible alternatives, the possibility that the noted features represent an ichnological signature of elephant seismicity or seismic communication needs to be considered. The rock art record in southern Africa suggests that ancestral humans were aware of elephant seismic communication. A comprehensive approach to elephant seismicity can involve not just research into the habits of extant elephants, but also the rock art record and the trace fossil record. To illustrate these concepts, findings from South African trace fossil sites and rock art sites are presented.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 1","pages":"Pages 18-35"},"PeriodicalIF":1.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0016787823000792/pdfft?md5=9a89294bafb2e1ec552e489d741ba23b&pid=1-s2.0-S0016787823000792-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135484446","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

Late Devensian to Holocene environmental change, Loch Lomond, UK: A seismic sedimentary record of deglaciation, paraglacial and postglacial landscape evolution 英国洛蒙德湖（Loch Lomond）从德文西亚晚期到全新世的环境变化：脱冰期、副冰期和后冰期地貌演变的地震沉积记录

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.09.005

Nicola Dakin, Andrew Finlayson, Gareth Carter, Rhys Cooper

{"title":"Late Devensian to Holocene environmental change, Loch Lomond, UK: A seismic sedimentary record of deglaciation, paraglacial and postglacial landscape evolution","authors":"Nicola Dakin, Andrew Finlayson, Gareth Carter, Rhys Cooper","doi":"10.1016/j.pgeola.2023.09.005","DOIUrl":"10.1016/j.pgeola.2023.09.005","url":null,"abstract":"<div>We present an interpretation of two-dimensional sub-bottom profiling data from Loch Lomond, Scotland, UK. Sediments deposited during and following the last glacier advance have been investigated for decades around the shores of Loch Lomond. For the first time, this study presents an interpretation of the subsurface providing a window into the late Quaternary and Holocene history of Loch Lomond and its surrounding. The seismic stratigraphy records the infill of the loch during the final stages of the Loch Lomond Stadial (LLS, 12.9–11.7 ka BP), through the Holocene and into the present day. Results reveal the presence of distinct seismic facies (SF) identifying four principal seismic horizons; SF-I, SF-II, SF-III, and SF-IV. The SF-I horizon represents the glaciated surface, interpreted as subglacial till (locally forming drumlins), glacial moraines or bedrock. Ice retreat was accompanied by glaciolacustrine sedimentation in a proglacial lake setting, depositing up to 44 m of laminated sediments and ice marginal fans (SF-IIa, b). A period of landscape instability followed with extensive deposition of mass transport deposits (SF-III). These deposits, characterised by chaotic seismic facies with an erosional basal surface, are up to 43 m thick and may represent up to 50 % of the sediment fill. SF-IV comprises finely laminated sediments deposited during the Holocene and highlights slower sedimentation rates in comparison to earlier phases of sedimentation. This study reveals new insights into the deglaciation of Loch Lomond, including previously unrecognised extensive mass transport deposits buried in the subsurface, associated with a period of paraglacial adjustment.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 1","pages":"Pages 1-17"},"PeriodicalIF":1.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0016787823000780/pdfft?md5=fb681c3ef4d608f186cb79f9d2ae75e1&pid=1-s2.0-S0016787823000780-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134934570","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

Algal microfacies in the Theniet Et Temar Formation (middle Oxfordian), Central Saharan Atlas, Algeria 阿尔及利亚撒哈拉阿特拉斯中部 Theniet Et Temar 地层（牛津纪中期）的藻类微地貌

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.11.004

Chikh Younes Mahboubi , Mohammed Nadir Naimi , Mike Simmons , Mike Bidgood

{"title":"Algal microfacies in the Theniet Et Temar Formation (middle Oxfordian), Central Saharan Atlas, Algeria","authors":"Chikh Younes Mahboubi , Mohammed Nadir Naimi , Mike Simmons , Mike Bidgood","doi":"10.1016/j.pgeola.2023.11.004","DOIUrl":"10.1016/j.pgeola.2023.11.004","url":null,"abstract":"<div>During the Oxfordian, sea-level rise created widespread carbonate platform deposition on the margins of Neotethys, although some areas remain poorly described. One such area is the Saharan Atlas of Algeria. Accordingly, the middle Oxfordian Theniet Et-Temar Formation at a new locality, Kef El Meleh, is described for the first time. Formed of marl/limestone cycles, 6 broad microfacies are present within the limestones, representing deposition in lagoon, shoal and nearshore environments. Whilst overall shallowing-up is evident, it is unclear if the smaller scale marl–carbonate cycles represent higher frequency shallowing-up, or allocyclic depositional patterns.The Theniet Et-Temar Formation contains an important archive of macrofossils and microfossils. Of note at Kef El Meleh is the presence of a microfacies rich in dasycladalean algae, notably Salpingoporella annulata Carozzi, 1953. The specimens conform well to the type and subsequent descriptions. The assemblage is effectively monospecific in terms of algae, although the larger foraminifera Alveosepta jaccardi (Schrodt, 1894) is present. This record extends the knowledge of the distribution of S. annulata within Neotethys, especially within the Oxfordian, for which previous records are limited in comparison to those for the later Jurassic and Early Cretaceous.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 1","pages":"Pages 78-88"},"PeriodicalIF":1.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138566218","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

Coprolites of the ichnogenus Alococopros from the Late Cretaceous of Morocco 摩洛哥白垩纪晚期Alococopros的桡足石

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.11.005

Christopher J. Duffin , David J. Ward

引用次数: 0

The influence of bedrock faulting and fracturing on sediment availability and Quaternary slope systems, Talla, Southern Uplands, Scotland, UK 英国苏格兰南部高地塔拉，基岩断层和断裂对沉积物可用性和第四纪斜坡系统的影响

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.11.003

Katie Whitbread, Chris Thomas, Andrew Finlayson

{"title":"The influence of bedrock faulting and fracturing on sediment availability and Quaternary slope systems, Talla, Southern Uplands, Scotland, UK","authors":"Katie Whitbread, Chris Thomas, Andrew Finlayson","doi":"10.1016/j.pgeola.2023.11.003","DOIUrl":"10.1016/j.pgeola.2023.11.003","url":null,"abstract":"<div>In bedrock-dominated upland terrains, local heterogeneity in the erodibility of rock masses is a critical but under-explored factor constraining sediment erosion, mobilisation and transport. Here we examine how fault-related fracturing controls variations in the erodibility and grain-size of bedrock source material at the hillslope-scale. We then assess how this influences the evolution of slope sediment systems using a case-study from the Southern Uplands, Scotland, UK. Faults are associated with fracture densities that are an order of magnitude greater than background joint- and bedding-related fractures in weakly metamorphosed sedimentary rocks. Thus, fault zones are enhanced source areas yielding more abundant, smaller clasts. They are associated with enhanced erosion, gullying and debris flows, and the development of blanket colluvium on steep open hillsides. The orientation at which faults intersect the hillslope constrains the evolution of the sediment system. Faults with trends closely aligned to the direction of slope are associated with higher erosion via confined-channel debris flow activity in strongly coupled gullies. Faults that are oblique to slope direction disrupt and segment gully systems developed on minor transfer faults. Overall, faults that are oblique to slope direction are associated with lower erosion and give rise to decoupling within debris flow systems. Inclusion of geological weighting parameters in the formulation of a sediment connectivity index to characterise the effect of faulting on the erodibility and mobility of source material improves correspondence of the model with observations and provides a simple approach that could be adapted for other sources of geological heterogeneity.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 1","pages":"Pages 61-77"},"PeriodicalIF":1.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0016787823000937/pdfft?md5=a5610c6c6675d32cef8454071281261f&pid=1-s2.0-S0016787823000937-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138562087","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

The first scyphocrinitid loboliths from Thailand 泰国出土的第一块鞘状叶石

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2024.01.001

Clive Burrett , Xiang Fang , Wenjie Li , Hathaithip Thassanapak , Mongkol Udchachon

引用次数: 0

Evaluation of the Late Messinian Abu Madi sandstone reservoirs in the West Al Khilala gas field, Onshore Nile Delta, Egypt 埃及尼罗河三角洲西Al Khilala气田晚墨西尼亚期Abu Madi砂岩储层评价

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-02-01 DOI: 10.1016/j.pgeola.2023.11.001

Ahmed Ali , Ramadan S.A. Mohamed , Mohamed Abou Heleika , Mahmoud Gabr , Mohamed Hashem , Mohamed S. Ahmed , Mohamed Abioui , Souvik Sen , Ahmed A. Abdelhady

{"title":"Evaluation of the Late Messinian Abu Madi sandstone reservoirs in the West Al Khilala gas field, Onshore Nile Delta, Egypt","authors":"Ahmed Ali , Ramadan S.A. Mohamed , Mohamed Abou Heleika , Mahmoud Gabr , Mohamed Hashem , Mohamed S. Ahmed , Mohamed Abioui , Souvik Sen , Ahmed A. Abdelhady","doi":"10.1016/j.pgeola.2023.11.001","DOIUrl":"10.1016/j.pgeola.2023.11.001","url":null,"abstract":"<div>In this study, we integrated cores and wireline logs to evaluate the petrographical and petrophysical properties of the Late Miocene Abu Madi sandstone reservoir from the onshore WAK gas field. Thin section petrographic analyses indicate that the reservoir consists of coarse to fine-grained, poorly sorted, subangular to subrounded glauconitic quartz arenites exhibiting high mineralogical maturity, poor textural maturity, and good volume of intergranular porosity. Based on the downhole pressure data, we estimated that the gas gradient was somewhere between 0.24 and 0.26 psi/m. The SEM images suggest the pore filling authigenic chlorite and kaolinite cementation to be the dominant diagenetic process reducing the reservoir quality. The presence of concavo-convex grain contacts in the reservoir samples is indicative of a moderate degree of mechanical compaction by burial load. The massive sandstone reservoir facies represents stacked braided fluvial channels deposited during a lowstand system tract unconformably above the Qawasim Formation. Based on well log-based petrophysical analyses, the Abu Madi reservoir has a total porosity of 17–20 % with 14.6–18.3 % effective porosity and 39.4 to 47.9 % water saturation. Gross reservoir thickness varies between 28.3 and 51.1 m, whilst the net pay thickness ranges between 18.4 and 43.7 m, which translates to a high net-to-gross (N/G) ratio of 0.65–0.84. Lateral distribution of the petrophysical parameters infers a superior reservoir quality towards the central part of the studied field which should be targeted for future infill development well drilling. The reservoir heterogeneity was mapped to substantially decrease the uncertainty of future drilling.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 1","pages":"Pages 45-56"},"PeriodicalIF":1.2,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138512085","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