Atlantic Geoscience最新文献_第3页

The ‘lost’ islands of Cardigan Bay, Wales, UK: insights into the post-glacial evolution of some Celtic coasts of northwest Europe 英国威尔士卡迪根湾的“失落”岛屿:对欧洲西北部一些凯尔特海岸冰川后进化的见解

Atlantic Geoscience Pub Date : 2022-06-11 DOI: 10.4138/atlgeo.2022.005

S. Haslett, David G. Willis

{"title":"The ‘lost’ islands of Cardigan Bay, Wales, UK: insights into the post-glacial evolution of some Celtic coasts of northwest Europe","authors":"S. Haslett, David G. Willis","doi":"10.4138/atlgeo.2022.005","DOIUrl":"https://doi.org/10.4138/atlgeo.2022.005","url":null,"abstract":"A 13th –14th-century map held in the Bodleian Library (the Gough Map and the oldest map of Great Britain) shows two ‘lost’ islands in Cardigan Bay offshore west Wales, United Kingdom. This study investigates historical sources, alongside geological and bathymetric evidence, and proposes a model of post-glacial coastal evolution that provides an explanation for the ‘lost’ islands and a hypothetical framework for future research: (1) during the Pleistocene, Irish Sea ice occupied the area from the north and west, and Welsh ice from the east, (2) a landscape of unconsolidated Pleistocene deposits developed seaward of a relict pre-Quaternary cliffline with a land surface up to ca. 30 m above present sea-level, (3) erosion proceeded along the lines of a template provided by a retreating shoreline affected by Holocene sea-level rise, shore-normal rivers, and surface run-off from the relict cliffline and interfluves, (4) dissection established islands occupying cores of the depositional landscape, and (5) continued down-wearing, marginal erosion and marine inundation(s) removed the two remaining islands by the 16th century. Literary evidence and folklore traditions provide support in that Cardigan Bay is associated with the ‘lost’ lowland of Cantre’r Gwaelod. The model offers potential for further understanding post-glacial evolution of similar lowlands along northwest European coastlines.","PeriodicalId":142525,"journal":{"name":"Atlantic Geoscience","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131324353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Note on the discovery of Carboniferous amber associated with the seed fern Linopteris obliqua, Sydney Coalfield, Nova Scotia, Canada 加拿大新斯科舍省悉尼煤田石炭纪种子蕨类Linopteris obliqua琥珀的发现注释

Atlantic Geoscience Pub Date : 2022-06-11 DOI: 10.4138/atlgeo.2022.006

M. Mastalerz, E. Zodrow

引用次数: 0

Further evidence for the East Coast fault system and faults associated with the Summerville restraining bend and their possible relationship to the 1886 Charleston, South Carolina, earthquake, USA 东海岸断层系统和与萨默维尔抑制弯曲有关的断层及其与1886年美国南卡罗来纳州查尔斯顿地震的可能关系的进一步证据

Atlantic Geoscience Pub Date : 2022-05-31 DOI: 10.4138/atlgeo.2022.004

R. Marple, James D. Hurd, Jr.

{"title":"Further evidence for the East Coast fault system and faults associated with the Summerville restraining bend and their possible relationship to the 1886 Charleston, South Carolina, earthquake, USA","authors":"R. Marple, James D. Hurd, Jr.","doi":"10.4138/atlgeo.2022.004","DOIUrl":"https://doi.org/10.4138/atlgeo.2022.004","url":null,"abstract":"The integration of aeromagnetic, LiDAR, and previously acquired seismic-reflection data and surficial geologic maps supports the existence of the East Coast fault system ( and faults associated with its 12⁰ Summerville restraining bend beneath the South Carolina Coastal Plain. Aeromagnetic data revealed a 10- to 15-km-wide zone of subtle, 22- to 35-km-long linear magnetic anomalies trending ~N10°E across the southern meizoseismal area of the 1886 Charleston earthquake that we postulate are associated with Cenozoic low-displacement brittle faults in the crystalline basement west of Charleston. We hypothesize that lineaments ML4 and ML5 represent the principal displacement zone along the southern end of the ECFS because they coincide with steeply dipping, west-side-up buried faults interpreted from previously acquired seismic-reflection profiles and a ~320-m dextral offset in the Brownsville Pleistocene beach ridge deposit. The alignment of the NNE-SSW-oriented Edisto dome, uplift along releveling line 9, gently upwarped longitudinal profiles along the Caw Caw and Horse Savanna swamps, local incision along the Ashley River, and exposures of the early Oligocene Ashley Formation near the incised part of the Ashley River support Quaternary uplift along the southern ECFS. The 12⁰ change in trend formed by lineaments ML4 and ML5 supports the existence of the Summerville restraining bend in the ECFS, east of which are numerous ENE-WSW- to NW-SE-oriented LiDAR lineaments that we postulate are surface expressions of faults that formed to compensate for the increased compression produced by dextral motion along the bend. Sinistral displacement along one of these proposed faults associated with the ~40-km-long, east-west-oriented Deer Park lineament may have produced the main shock of the 1886 Charleston earthquake. \u0000 \u0000 ","PeriodicalId":142525,"journal":{"name":"Atlantic Geoscience","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128841563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Jurassic palynoevents in the circum-Arctic region 环北极地区的侏罗纪晚期事件

Atlantic Geoscience Pub Date : 2022-05-30 DOI: 10.4138/atlgeo.2022.003

J. Bujak, M. Bringué, A. Goryacheva, N. Lebedeva, E. Pestchevitskaya, J. Riding, M. Smelror

{"title":"Jurassic palynoevents in the circum-Arctic region","authors":"J. Bujak, M. Bringué, A. Goryacheva, N. Lebedeva, E. Pestchevitskaya, J. Riding, M. Smelror","doi":"10.4138/atlgeo.2022.003","DOIUrl":"https://doi.org/10.4138/atlgeo.2022.003","url":null,"abstract":"Successions of Jurassic strata located in the Arctic region normally yield rich assemblages of terrestriallyderived and marine palynomorphs, reflecting relatively warm air and sea-surface temperatures. The land plant floras were prone to the development of local communities and regional provincialism, whereas the marine biotas thrived across extensive open marine areas with high productivity, resulting in the rapid evolution of dinoflagellate cysts (dinocysts) following their earliest fossil record in the Triassic. Dinocysts exhibit low taxonomic richness and provide low biostratigraphic resolution throughout the Lower Jurassic sections. By contrast, they are diverse in Middle and Upper Jurassic strata where they provide excellent biostratigraphic markers for correlating and dating both surface and subsurface sections. Over twenty formal and informal biozonations based on the firstand last occurrences of dinocysts have been erected in Alaska, Arctic Canada, the Barents Sea region, Greenland and northern Russia, many of which are correlated with macrofossils, including ammonites, that occur in the same sections. This paper presents a compilation of 214 Jurassic palynostratigraphic events (118 first occurrences and 96 last occurrences) that have regional chronostratigraphic value in the Circum-Arctic, based on their published records. Each event is correlated with the base of a chronostratigraphical unit (including formal stages and sub-Boreal ammonite zones), or as an estimated percentage above the base of the chronostratigraphical unit relative to the entire unit. The relationships of each event to stages and key fossil zonal schemes is shown on chronostratigraphic plots using the 2020 version of TimeScale Creator®.","PeriodicalId":142525,"journal":{"name":"Atlantic Geoscience","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126292474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Geological Association of Canada-Newfoundland and Labrador Section Abstracts: Spring Technical Meeting, February 21 and 22, 2022 加拿大地质协会-纽芬兰和拉布拉多分会摘要:春季技术会议，2022年2月21日和22日

Atlantic Geoscience Pub Date : 2022-04-04 DOI: 10.4138/atlgeo.2021.002

Atlantic Geoscience Editors

引用次数: 0

Atlantic Geoscience Society Abstracts: 48th Annual Colloquium and General Meeting, February 11 and 12, 2022 大西洋地球科学学会文摘:第48届年会暨大会，2022年2月11日至12日

Atlantic Geoscience Pub Date : 2022-03-30 DOI: 10.4138/atlgeo.2022.001

Atlantic Geoscience Editors

引用次数: 0