Proceedings of the Geologists Association最新文献

{"title":"Integrating earth observation technologies in geoscience education: A field-based case study from Chicamocha Canyon, Colombia","authors":"Carlos Alberto Villarreal J.,&nbsp;Julián David Rojas D.,&nbsp;Leily Johanna Candela B.,&nbsp;Jose Pedro Mora O.,&nbsp;Carlos Alberto Ríos R.","doi":"10.1016/j.pgeola.2026.101198","DOIUrl":"10.1016/j.pgeola.2026.101198","url":null,"abstract":"<div><div>Field-based education is fundamental for developing practical skills in geoscience students. This study presents a case from the Lower Basin of the Chicamocha River Canyon, Colombia, where traditional geological field methods are integrated with a range of Earth observation technologies to enhance data acquisition, mapping, and interpretation. This region is characterized by diverse lithologies and geomorphological complexity, providing an ideal natural laboratory for evaluating the application of modern tools, including global navigation satellite systems (GNSS), smartphones with compass, field notebook, and database applications, geographic information systems (GIS) with surface modelling and mobile applications, Google Earth, remote sensing, Unmanned Aerial Vehicles (UAVs), and 3D geological models, which enable high-resolution topographic mapping, structural analysis, and geospatial data visualization in real time. A survey of 114 participants, including students, recent graduates, and professionals, assessed the impact of combining traditional field techniques with advanced technologies on learning and professional development. Findings suggest that this integrated approach is pedagogically enriching and essential for preparing students for modern geoscientific challenges, highlighting the value of geospatial data and field-based learning.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101198"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096132","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}

{"title":"Thickness and facies changes in the Upper Jurassic Corallian Group to the east and south of Oxford, England","authors":"Nigel Banks","doi":"10.1016/j.pgeola.2026.101227","DOIUrl":"10.1016/j.pgeola.2026.101227","url":null,"abstract":"<div><div>The Upper Jurassic Corallian Group sediments near Oxford, England, comprise a lower sandy clastic unit, the Kingston Formation, and an upper carbonate unit, the Stanford Formation. The combined thickness is 30–40 m. In the WSW-ENE outcrop belt these two facies thin and shale out rapidly near the village of Wheatley, <em>ca.</em> 7 km east of Oxford, and, with one minor exception, do not reappear again until the outcrop reaches Yorkshire. Previous studies have argued about whether the source of the sands was from the east or west, whether the ENE dips seen in the carbonate outcrops in and near Wheatley are structural or depositional, and on the possible influence of contemporaneous faulting on the location of the shale-out. New borehole data has become available in recent years, and this allows more detailed mapping of the Corallian thickness and facies trends across the area east of Oxford where the Corallian is present in the subsurface. This mapping leads to a new interpretation of Corallian deposition, suggesting a broadly N-S shale-out trend of both clastics and carbonates extending at least 30 km south of Wheatley. It also supports a northwesterly source of the sands, and the development of carbonate shelf edge sediments that were deposited over an earlier sand bank ramp with no need to invoke contemporaneous faulting.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101227"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096133","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}

{"title":"Stratigraphy of the Bouldnor Formation (Solent Group, Eocene–Oligocene) of the Isle of Wight, UK","authors":"Andy Gale","doi":"10.1016/j.pgeola.2026.101209","DOIUrl":"10.1016/j.pgeola.2026.101209","url":null,"abstract":"<div><div>The lithological succession of the Bouldnor Formation of the Isle of Wight is described in detail for the first time, and correlations are made between successions on the northwest of the island (Bouldnor, Thorness, Gurnard) that in the southeast (Whitecliff–Howgate). The succession comprises rhythmically bedded clays and silts, containing numerous palaeosols and detailed correlation is enabled by a series of lithological and faunal marker beds. Many of these represent brief, but very widespread, brackish transgressions on a muddy coastal plain. The succession in the south-east of the island is markedly coarser, containing numerous silt beds. There is evidence of structural control by contemporaneous movements on the Bouldnor Syncline and Porchfield Anticline.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101209"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096026","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}

{"title":"Thin-skinned tectonic deformation within the southern Atlas foreland folds and thrust belts of Tunisia","authors":"Hazem Trigui,&nbsp;Riadh Ahmadi,&nbsp;Chaouki Khalfi","doi":"10.1016/j.pgeola.2026.101211","DOIUrl":"10.1016/j.pgeola.2026.101211","url":null,"abstract":"<div><div>The southern segment of the Oriental Atlas represents a key zone for studying deformation patterns within the North African foreland basins. Our investigation focused on studying deformation within the Orbata, Chemsi, and Belkhir anticlines located in Tunisia. Our structural observations indicate that the deposition of Cretaceous and early Cenozoic sedimentary rocks was affected by numerous normal faults. Compressive deformation from the Miocene to the Quaternary has been documented in (1) fractures, which were studied at various measurement sites and revealed faults, veins, shear joints, conjugate shear joint systems, tension joints, and pressure-solution sets, exhibiting an NNW–SSE shortening direction; and (2) folds, which were examined in three cross sections. The balanced cross-sections and the restored models demonstrate that normal faults influenced the basin geometry. These structures were later inverted to accommodate contractional deformation. Secondary normal fault sets linked to the major faults played a significant role in determining the position of the main thrust systems. This gave rise to the Orbata, Chemsi, and Belkhir anticlines through in-sequence thin-skinned deformation. Structural analysis suggests that the three anticlines originated through fault-propagation folding. The Belkhir anticline displays a simple step configuration, whereas the Orbata and Chemsi anticlines exhibit more complex geometries involving break-out thrusts. During this phase of Cenozoic contractional deformation the detachment levels were within the Triassic series. Seismic line interpretations across the Sidi Mansour Basin validate our results, showing clear thickness variations within the Mesozoic sequence and evidencing a thin-skinned deformational regime.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101211"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096136","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}

{"title":"New whale barnacle records from eastern North America (Early Pleistocene of the Carolinas, USA, and Late Pleistocene or Early Holocene of Montreal, Canada)","authors":"Andy Gale,&nbsp;Alberto Collareta","doi":"10.1016/j.pgeola.2026.101218","DOIUrl":"10.1016/j.pgeola.2026.101218","url":null,"abstract":"<div><div>We provide details and illustrations of three new occurrences of fossil whale barnacles from northeastern North America; <em>Coronula bifida</em> (Bronn, 1831), from the Gelasian Waccamaw Formation of North Carolina, USA; <em>Coronula diadema</em> (Linnaeus, 1767), from the Late Pleistocene or Early Holocene postglacial deposits of Montreal, Quebec Province, Canada; and <em>Cetopirus fragilis</em> (Collareta et al., 2016), from the Early Pleistocene of South Carolina, USA (only the second record of this species, previously known from Italy). The records of <em>C. bifida</em> from the Carolinas indicate that, in the Pliocene and Early Pleistocene, humpback whales extended far further south along the western Atlantic seaboard than they do at the present day.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101218"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096138","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}

{"title":"Hydrothermal alteration and regolith development associated with orogenic gold mineralisation in the Sanankoro district, southern Mali (West African Craton)","authors":"Coumba Makan Fofana,&nbsp;Akinade Shadrach Olatunji,&nbsp;Mamadou Lamine Bouaré,&nbsp;Salia Coulibaly","doi":"10.1016/j.pgeola.2026.101229","DOIUrl":"10.1016/j.pgeola.2026.101229","url":null,"abstract":"<div><div>The Sanankoro district, located within the Birimian green-stone belts of southern Mali, hosts structurally controlled orogenic gold mineralisation. This study investigates the relationships between hydrothermal alteration, regolith development, and gold mineralisation through geological mapping, drill-core logging and sampling, petrographic observations, and regolith characterisation. The principal hydrothermal alteration assemblages identified in mineralised rocks include carbonatisation, silicification, sericitisation, chloritisation, and sulphidation, commonly associated with quartz–carbonate veins, hydrothermal breccias, and ductile shear zones. Petrographic observations reveal multiple generations of pyrite characterised by distinct textural domains and deformation-related fractures, recording episodic hydrothermal activity and structural modification of the mineralised system. The regolith profile consists of ferrallitic/lateritic horizons, lateritic saprolite, fresh saprolite, and locally transported alluvial and colluvial materials. These weathering profiles influence the preservation and surface dispersion of mineralised material. Integration of structural, hydrothermal, and regolith observations indicates that gold mineralisation is primarily controlled by ductile shear zones and associated hydrothermal fluid pathways, whereas subsequent weathering processes modify its surface expression and distribution. Comparison with the Wassa and Syama gold systems indicates that the association of major deformation zones, hydrothermal alteration, quartz–carbonate veining, and regolith development represents a common exploration framework within the Birimian terrains of West Africa. The results provide new constraints on the structural and hydrothermal characteristics of the Sanankoro gold system and contribute to the understanding of gold exploration in deeply weathered Birimian greenstone belts.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101229"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096134","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}

{"title":"Microvertebrates from the Rhaetian bone beds at the Carrefour site, Patchway, near Bristol","authors":"Lavanya Ralhan,&nbsp;Joseph L. Mercer,&nbsp;Christopher J. Duffin,&nbsp;Claudia Hildebrandt,&nbsp;Tim Tomkinson,&nbsp;Deborah Hutchinson,&nbsp;Sue Swansborough,&nbsp;Michael J. Benton","doi":"10.1016/j.pgeola.2026.101226","DOIUrl":"10.1016/j.pgeola.2026.101226","url":null,"abstract":"<div><div>The Carrefour site at Patchway, north of Bristol, reveals an exposure of the Westbury Formation, including two Rhaetian bone beds. This is the first published report of the microvertebrate assemblage of this locality, following excavations and observations in 1977, 2024, and 2025. As usual, the species <em>Lissodus minimus</em> and <em>Gyrolepis albertii</em> are abundant, but the location is significant as a source of rare species including the sharks <em>Parascylloides turnerae</em> and <em>Pseudodalatias barnstonensis</em> and the marine reptile <em>Pachystropheus rhaeticus</em>. The two bone beds differ in composition, showing a switch from chondrichthyan to osteichthyan dominated faunas. They differ also taphonomically, in degree of abrasion, colouration and chemical composition, confirming that the upper bone bed cannot have been reworked from the lower bone bed, as previously suggested for other localities. There is evidence for water deepening through the Westbury Formation record, as expected with advance of the Rhaetian Transgression through time. We re-assess cephalopod hooklets reported earlier from the Westbury Formation and conclude that these, and new specimens from the Carrefour site, are probably clasper denticles of the shark <em>Pseudodalatias</em>.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101226"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096025","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}

{"title":"Earthquake induced soft-sediment deformation in the Ladinian–Carnian transition deposits of the Tataouine Basin (Southern Tunisia)","authors":"Mabrouk Krimi,&nbsp;Noureddine Elmejdoub,&nbsp;Mohamed Ouaja,&nbsp;Fouad Zargouni","doi":"10.1016/j.pgeola.2026.101210","DOIUrl":"10.1016/j.pgeola.2026.101210","url":null,"abstract":"<div><div>The Triassic succession exposed along the Djebal Rehach–Touareg escarpment (southern Tunisia) provides a well-preserved record of environmental, tectonic, and syn-depositional deformation processes within an active NW-SE Djeffara System fault. Stratigraphical analysis documents a long-term evolution from the fluvial systems of the Kirchaou Formation to tidally influenced estuarine deposits, followed by shallow-marine carbonate platform and offshore environments during the Carnian transgression. A major unconformity at the base of the Touareg Formation reflects a forced regressive event linked to extensional tectonics along NW–SE faults. Within this succession, a 1-m-thick deformed interval at the top of the Kirchaou Formation preserves a diverse suite of soft-sediment deformation structures (SSDSs) including pillow structures, boudinage, loop bedding, pinch-and-swell geometries, microfaults, and recumbent folds indicating deformation of water-rich, semi-consolidated sediments. The coexistence of compressional and extensional features, preservation of primary lamination, and coherent kinematic patterns support an origin related to earthquake-induced liquefaction and slump processes. These structures constitute a seismite horizon recording syndepositional seismicity during the Upper Ladinian to Lower Carnian. The integrated stratigraphical and deformational evidence highlights the strong interplay between tectonics, relative sea-level change, and sedimentation during Triassic evolution of the Tataouine Basin.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101210"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096135","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}

{"title":"The 19th century Ciment de Vassy: history, geological context, raw materials and industrial heritage","authors":"Vincent Thiéry","doi":"10.1016/j.pgeola.2026.101212","DOIUrl":"10.1016/j.pgeola.2026.101212","url":null,"abstract":"<div><div>The <em>Ciment de Vassy</em> is a famous 'Roman' (<em>i.e.,</em> natural, fast setting, made from the burning of a single lithology) cement discovered around 1830 close to Avallon, Yonne, Burgundy, France. Its outstanding strength and durability led to its use all around the country and fostered its high reputation. Based on the burning of specific Toarcian marls, it had a beautiful ochre colour, promoting its use not only as a binder but also in decorative, false stone ornaments. Nowadays, none of the plants and quarries are exploited and there is almost no official preservation of buildings incorporating this cement. There are however still visible traces of quarrying, which affected the topography, and several vertical kilns and part of plants (mills, industrial storages…) can be seen. This heritage spans from 1830 to the early 1960s, when the last plant closed. The exceptional palaeontological record of the shales has been noticed since more than one century; a seven-metre long <em>Ichthyosaurus</em> from one of the former quarries was even on display at the Paris 1889 universal exhibition. Moreover, an underground fire in the bituminous shales associated with the layers used to make those cements makes this area particularly interesting for the study of all its geological aspects.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101212"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096137","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}

{"title":"The marginal Late Triassic of South Wales","authors":"Peter Hodges","doi":"10.1016/j.pgeola.2026.101225","DOIUrl":"10.1016/j.pgeola.2026.101225","url":null,"abstract":"<div><div>The marginal Triassic geology of South Wales is poorly understood due to a lack of suitable exposures. A temporary exposure at a housing development at Brackla, Bridgend and a recently cleared section at the abandoned Quarella quarry, Bridgend by the local RIGS group have allowed the stratigraphy, lithology and palaeontology to be investigated in detail. A borehole at a new housing development at Brackla produced additional data from the early Jurassic down to the Triassic Mercia Mudstones. The Brackla Mudstone Formation is introduced for the local marginal facies of the Cotham Formation and the Quarella Sandstone Formation for the marginal facies of the Westbury Formation. The White Lias Formation is identified at the Quarella quarry and is the most westward occurrence of this formation in South Wales to date.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 5","pages":"Article 101225"},"PeriodicalIF":1.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096139","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}