Proceedings of the Geologists Association最新文献_第9页

Iron–titanium sands of the Atlantic beaches between Tan-Tan and Tarfaya (southwest Morocco): Characterisation and origin Tan Tan和Tarfaya（摩洛哥西南部）之间大西洋海滩的铁-钛砂：特征和起源

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.04.003

M. Abioui , E.H. Abia , M. Benssaou , A.Z. Ekoa Bessa , K. Abdelrahman

{"title":"Iron–titanium sands of the Atlantic beaches between Tan-Tan and Tarfaya (southwest Morocco): Characterisation and origin","authors":"M. Abioui , E.H. Abia , M. Benssaou , A.Z. Ekoa Bessa , K. Abdelrahman","doi":"10.1016/j.pgeola.2023.04.003","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.04.003","url":null,"abstract":"<div>In Morocco, the most important placers of ferrotitanium minerals are found along the Laâouina–Cape Juby Atlantic coastline, where they accumulate in the upper parts of the foreshores. The heavy minerals would come from the dismantling of the acidic to intermediate magmatic rocks of the Precambrian Anti-Atlasic buttonholes and from the Meseta basement where crystallophyllous rocks predominate. The sands emanating from this erosion, once ejected by the rivers in the Atlantic, are transported by the littoral drift in the direction of the south before being trapped at the level of the great virgation of the shoreline of Laâouina–Cape Juby. The wind deflation, in its turn, reinforces this sorting by carrying away the white sands towards the continent and also the black sands sometimes. The cliffs along the coast of Laâouina–Sidi Akhfenir are, however, barriers against wind loss unlike the sector of Sidi-Akhfenir–Cape Juby where the continuous migration of sands to the hinterland is facilitated by the absence of cliffs. The conjunction of these factors has the consequence of weakening the retention of sands' ferrotitanium in the sector Sidi Akhfenir–Cape Juby compared with its counterpart of Laâouina–Sidi Akhfenir. In general, the Laâouina–Cape Juby coastline can be considered a morphological and hydrodynamic trap whose concentrations in ferrotitanium minerals are likely to earn the quality of a mining district despite its seasonal instability and the difficulty of estimating reserves. Indeed, in this supposed district, heavy minerals total about 95 % of the raw sediments and ilmenite predominates and its alteration state is only superficial.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 3","pages":"Pages 329-343"},"PeriodicalIF":1.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49844970","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 curious case of Central Park's dinosaurs: The destruction of Benjamin Waterhouse Hawkins' Paleozoic Museum revisited 中央公园恐龙的奇特案例：本杰明·沃特豪斯-霍金斯古生代博物馆被毁事件重访

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.04.004

Victoria Coules , Michael J. Benton

{"title":"The curious case of Central Park's dinosaurs: The destruction of Benjamin Waterhouse Hawkins' Paleozoic Museum revisited","authors":"Victoria Coules , Michael J. Benton","doi":"10.1016/j.pgeola.2023.04.004","DOIUrl":"https://doi.org/10.1016/j.pgeola.2023.04.004","url":null,"abstract":"<div>In May 1871, models and skeleton casts of dinosaurs and other ancient vertebrates destined for a new Paleozoic Museum in Central Park, New York were smashed and destroyed. This greatest act of vandalism in the history of dinosaur study and museum development was attributed to the infamous William ‘Boss’ Tweed, leader of a notorious group of rogue politicians who at the time held the reins of power in the booming city. Our research on primary sources shows that Tweed was not involved, and the real villain was Henry Hilton, a powerful lawyer and businessman. Benjamin Waterhouse Hawkins had been employed to do the work and yet he was dismissed and not compensated, creating a scandal. Contrary to the generally accepted narrative of these events, we find no religious motive for the destruction, only potential conflict with the developing American Museum of Natural History. Further, based on well-reported evidence, we find that Hilton exhibited an eccentric and destructive approach to cultural artefacts, and a remarkable ability to destroy everything he touched, including the huge fortune of the department store tycoon Alexander Stewart. Evidently the destruction of Hawkins' New York City dinosaurs was one of many such crazy actions through his life; Hilton was not only bad, but also mad.</div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"134 3","pages":"Pages 344-360"},"PeriodicalIF":1.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49844972","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: 1

The Isle of Wedmore relay ramp: how fault evolution created King Alfred's historic landmark Wedmore岛中继坡道：断层演化如何造就阿尔弗雷德国王的历史地标

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2023-06-01 DOI: 10.1016/j.pgeola.2023.04.001

A.J. Newell , D.C.P. Peacock

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 : 2023-06-01 DOI: 10.1016/j.pgeola.2023.05.003

M. Chaanda, S. Grimes, R. Jerrett, Mark Anderson, M. Leng, M. Fitzpatrick, G. Price

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 : 2023-06-01 DOI: 10.1016/j.pgeola.2023.05.004

N. Larkin, Thomas Henton, S. Etches, A. Wright, Tzu-Yu Chen, L. Driscoll, R. Shelton, I. Sansom

引用次数: 0

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