Scottish Journal of Geology最新文献_第8页

New theropod dinosaur teeth from the Middle Jurassic of the Isle of Skye, Scotland 苏格兰斯凯岛中侏罗世新发现的兽脚亚目恐龙牙齿

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2019-04-02 DOI: 10.1144/sjg2018-020

C. Young, Christophe Hendrickx, T. Challands, D. Foffa, D. Ross, I. Butler, S. Brusatte

{"title":"New theropod dinosaur teeth from the Middle Jurassic of the Isle of Skye, Scotland","authors":"C. Young, Christophe Hendrickx, T. Challands, D. Foffa, D. Ross, I. Butler, S. Brusatte","doi":"10.1144/sjg2018-020","DOIUrl":"https://doi.org/10.1144/sjg2018-020","url":null,"abstract":"The Middle Jurassic is a largely mysterious interval in dinosaur evolution, as few fossils of this age are known worldwide. In recent years, the Isle of Skye has yielded a substantial record of trackways, and a more limited inventory of body fossils, that indicate a diverse fauna of Middle Jurassic dinosaurs living in and around lagoons and deltas. Comparatively little is known about the predators in these faunas (particularly theropod dinosaurs), as their fossils are among the rarest discoveries. We here report two new isolated theropod teeth, from the Valtos Sandstone Formation and Lealt Shale Formation of Skye, which we visualized and measured using high-resolution x-ray computed microtomographic scanning (µCT) and identified via statistical and phylogenetic analyses of a large comparative dental dataset. We argue that these teeth most likely represent at least two theropod species – one small-bodied and the other large-bodied – which likely belonged to one or several clades of basal avetheropods (ceratosaurs, megalosauroids, or allosauroids). These groups, which were diversifying during the Middle Jurassic and would become dominant in the Late Jurassic, filled various niches in the food chain of Skye, probably both on land and in the lagoons. Supplementary material: Character lists, datasets, and measurements are available at https://doi.org/10.6084/m9.figshare.c.4452533","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":"55 1","pages":"19 - 7"},"PeriodicalIF":0.7,"publicationDate":"2019-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2018-020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47365207","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: 25

Erratum for ‘Lateglacial to Holocene palaeoenvironmental change in the Muck Deep, offshore western Scotland’ Scottish Journal of Geology, 54, 99-114 《苏格兰地质学杂志》，5499-114

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2019-02-26 DOI: 10.1144/SJG2018-025

R. Arosio, J. Howe

引用次数: 0

Timing of strain partitioning and magmatism in the Scottish Scandian collision, evidence from the high Ba–Sr Orkney granite complex 苏格兰-加拿大碰撞中应变分配和岩浆作用的时间，来自高Ba-Sr奥克尼花岗岩杂岩的证据

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-11-20 DOI: 10.1144/sjg2018-001

A. Lundmark, L. Augland, Audun Dalene Bjerga

{"title":"Timing of strain partitioning and magmatism in the Scottish Scandian collision, evidence from the high Ba–Sr Orkney granite complex","authors":"A. Lundmark, L. Augland, Audun Dalene Bjerga","doi":"10.1144/sjg2018-001","DOIUrl":"https://doi.org/10.1144/sjg2018-001","url":null,"abstract":"The Orkney granite complex dominates the outcropping basement on Orkney, Scotland. It comprises a grey and a pink variably foliated granite, and structurally younger pegmatites and aplites. Based on geochemical characteristics the granites are assigned to the Scottish high Ba–Sr granites. The granites are deformed by synmagmatic extensional east–west-trending mylonite zones. These are locally overprinted by similarly oriented extensional phyllonites and, in one case, by similarly oriented extensional faults. The grey and the pink granites are dated by zircon U–Pb CA-ID-TIMS to 431.93 ± 0.46 and 430.26 ± 0.92 Ma, respectively. An aplite cutting mylonitic granite and cut by phyllonite is dated to 428.50 ± 0.31 Ma. We interpret the shear zones to record north–south extension during emplacement and cooling of the granites, likely at a shallow crustal depth (4–12 km). The extension is best explained by a subsidiary pull-apart structure related to displacement on the Great Glen Fault. In this case, the Orkney granite complex dates transcurrent faulting to 432–429 Ma, coeval with the 431–429 Ma Moine Thrust. This indicates that strain partitioning and high Ba–Sr magmatism across the Scottish Highlands was an immediate response to attempted subduction of Avalonia beneath Laurentia during the Scandian collision. Supplementary material: Geochronological and geochemical data (Tables 1 and 2) as spreadsheets are available at https://doi.org/10.6084/m9.figshare.c.4304387","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":"55 1","pages":"21 - 34"},"PeriodicalIF":0.7,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2018-001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45931162","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: 4

Site selection of small round holes in crinoid pluricolumnals, Trearne Quarry SSSI (Mississippian, Lower Carboniferous), north Ayrshire, UK 英国艾尔郡北部Trearne采石场SSSI（密西西比，下石炭纪）海百合多柱体小圆孔的选址

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-10-16 DOI: 10.1144/sjg2018-010

S. Donovan, Gary Hoare

引用次数: 2

On the age of the Ballantrae Complex, SW Scotland 关于苏格兰西南部Ballantrae建筑群的年代

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-07-25 DOI: 10.1144/sjg2017-012

P. Stone, A. Rushton

{"title":"On the age of the Ballantrae Complex, SW Scotland","authors":"P. Stone, A. Rushton","doi":"10.1144/sjg2017-012","DOIUrl":"https://doi.org/10.1144/sjg2017-012","url":null,"abstract":"The Ballantrae Complex, SW Scotland, is an ophiolitic assemblage of mostly Early and early Middle Ordovician age (Tremadoc–Arenig in terms of the British Ordovician Series). Its varied components were generated and assembled in the Iapetus Ocean, then obducted on to the Laurentian continental margin by the earliest Llanvirn. The timing of obduction is constrained by biostratigraphic and radiometric data. It was most probably a polyphase process initiated at about the beginning of the Arenig, at around 478 Ma. However, parts of the Complex are significantly younger, with some recent evidence taken to suggest an earliest Llanvirn age of about 464 Ma for the emplacement of some of the volcanic and pelagic sedimentary rocks. The oldest strata in the succession that now unconformably overlies the Ballantrae Complex were deposited at about 463 Ma. Hence there may have been as little as one million years available for the final stages of the Complex's tectonic assembly, obduction, uplift, erosion and downfaulting. Obduction of the Complex has been invoked as a factor in the initiation of the Grampian Orogeny and, whilst there is a broad correlation in timing, the detail from Ballantrae militates against a causal relationship.","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":"54 1","pages":"77 - 86"},"PeriodicalIF":0.7,"publicationDate":"2018-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42598495","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

Allocation of Devonian acanthodian lectotypes 泥盆纪棘蜥选择型的分配

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-06-28 DOI: 10.1144/sjg2018-008

M. Newman, C. Burrow

引用次数: 0

The Lonfearn Member, Lealt Shale Formation, (Middle Jurassic) of the Inner Hebrides, Scotland 苏格兰内赫布里底群岛Lealt页岩组Lonfarn段（侏罗纪中期）

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-05-15 DOI: 10.1144/sjg2017-015

J. D. Hudson, M. Wakefield

{"title":"The Lonfearn Member, Lealt Shale Formation, (Middle Jurassic) of the Inner Hebrides, Scotland","authors":"J. D. Hudson, M. Wakefield","doi":"10.1144/sjg2017-015","DOIUrl":"https://doi.org/10.1144/sjg2017-015","url":null,"abstract":"The Lonfearn Member, Lealt Shale Formation, is a distinctive unit within the Great Estuarine Group in the Middle Jurassic of the Inner Hebrides, Scotland. Its dominant lithology of fine-grained, partly laminated mudstone marks it out as a time of minimum input of coarse clastic material into the Hebridean Basin, when consistent facies extended over some 90 km between north Skye and the Isle of Eigg. Interbedded with the mudstones are thin (decimetre) shelly and partly ferruginous and oolitic limestones, the combination giving a unique facies association in the British Bathonian. The predominantly low-salinity biota is dominated by the bivalve Neomiodon, ostracods and spinicaudatans. Episodes of inferred higher salinity aid in correlating sections from the type locality in North Trotternish, Skye to other localities, principally Strathaird in south Skye and the Isle of Eigg. We describe the principal outcrops of the Lonfearn Member and the remarkable facies continuity within the Great Estuarine Group indicating tectonic quiescence within the basin and hinterland at this time. Supplementary material: The detailed measured stratigraphical logs discussed in this paper are available at https://doi.org/10.6084/m9.figshare.c.4093991","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":"54 1","pages":"87 - 97"},"PeriodicalIF":0.7,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41742688","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: 4

A redescription of the endemic antiarch placoderm Asterolepis thule from the Middle Devonian (Givetian) of Shetland and its biostratigraphical horizon 设得兰群岛中泥盆世(吉文世)特有的反弓板皮动物Asterolepis thule的重新描述及其生物地层

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-05-15 DOI: 10.1144/sjg2018-005

M. Newman, J. D. Den Blaauwen

引用次数: 4

Lateglacial to Holocene palaeoenvironmental change in the Muck Deep, offshore western Scotland 苏格兰西部近海Muck Deep的晚冰期至全新世古环境变化

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-05-15 DOI: 10.1144/sjg2017-014

R. Arosio, J. Howe

{"title":"Lateglacial to Holocene palaeoenvironmental change in the Muck Deep, offshore western Scotland","authors":"R. Arosio, J. Howe","doi":"10.1144/sjg2017-014","DOIUrl":"https://doi.org/10.1144/sjg2017-014","url":null,"abstract":"Shelf basins (‘glacial incisions’) can preserve a detailed record of palaeoclimatic changes due to their low-energy environment. The ‘Muck Deep’, a complex of glacially-overdeepened troughs on the Inner Hebrides shelf constitutes an example of such an environment. Five sediment cores from the Muck Deep have been analysed and related to geomorphological evidence and subsurface seismic facies. The cores show an integrated sequence of sedimentary and faunal variations from the retreat of ice (c. 17 ka) to the present day. Glacimarine sandy muds with ice-rafted debris are dated to about 11.9 cal ka BP, supporting glacial occupancy in western Scotland until the latest stages of GS-1. The transition from a paraglacial to a more stable landscape is indicated by an erosional boundary in one of the cores dated between 11.3 and 11.6 cal ka BP. Sandy sediments in a core from 200 m water depth show two upward-fining cycles and a mid-core erosional unconformity, interpreted as bottom-current deposits. Such structures do not occur in the western Muck Deep, indicating different bottom current velocities through time. A regional signal of increasing current energy at the end of the Holocene marine transgression is interpreted as the onset of modern oceanographic conditions. Supplementary material: Extra figures and table content is available at https://doi.org/10.6084/m9.figshare.c.4093997","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":"54 1","pages":"114 - 99"},"PeriodicalIF":0.7,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48440494","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

Facies and petrographic assessment of Upper Devonian outcrops, Dunnet Head and Orkney, northern Scotland 苏格兰北部Dunnet Head和Orkney地区上泥盆统露头相及岩石学评价

IF 0.7 4区地球科学

Scottish Journal of Geology Pub Date : 2018-04-18 DOI: 10.1144/sjg2017-017

Longxun Tang, S. Jones, J. Gluyas

{"title":"Facies and petrographic assessment of Upper Devonian outcrops, Dunnet Head and Orkney, northern Scotland","authors":"Longxun Tang, S. Jones, J. Gluyas","doi":"10.1144/sjg2017-017","DOIUrl":"https://doi.org/10.1144/sjg2017-017","url":null,"abstract":"Upper Devonian strata occur in the Central and Northern North Sea and crop out in coastal exposures in northeastern Scotland. The strata comprise continental sandstones and intercalated conglomerates, siltstones and mudstones. The offshore Upper Devonian unit (Buchan Formation) has been proven as a locally important hydrocarbon reservoir; however, the limited core coverage in the North Sea means that the architecture of the Buchan Formation is poorly understood. This study looks at two localities in Caithness and Orkney with excellent Upper Devonian exposures, which are chronologically equivalent to the Buchan Formation. The main aims are to describe the facies present and to investigate the mineralogical compositions and porosity variations using petrographic analyses. The results indicate that the studied outcrops were formed by braided fluvial and aeolian dune deposition. The aeolian sandstones have higher compositional/textural maturity and porosity than the fluvial sandstones. The main control on porosity is facies variation that results in differences in sedimentary structures, grain size and abundance of rock fragments. With similar palaeoclimate, depositional environments, lithologies and petrographies, these outcrops can be considered excellent analogues for the Buchan Formation reservoirs in the North Sea.","PeriodicalId":49556,"journal":{"name":"Scottish Journal of Geology","volume":"54 1","pages":"51 - 61"},"PeriodicalIF":0.7,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1144/sjg2017-017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42059091","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