{"title":"Anomalous facies of the Kinnesswood Formation in the Cumbraes Basin: a late Famennian playa complex in southwest Scotland","authors":"W. G. E. Caldwell, G. M. Young","doi":"10.1144/pygs2020-002","DOIUrl":null,"url":null,"abstract":"Among the important geological attributes of the small Cumbraes Basin in the southwestern off-shore Midland Valley of Scotland, the 4 km-long, fragmented but well-exposed section through the Devonian-Carboniferous boundary sequence in southern Great Cumbrae island ranks highly. In a continuous short stretch of the south and west coasts, large portions of this sequence are superbly preserved in tide-washed strandline surfaces and in old post-glacial sea cliff. This enhanced exposure leaves no doubt that the outcrops belong to two, immediately successive, members of the Kinnesswood Formation -- the lower the Doughend Sandstone, the upper the Foul Port Mudstone – and that they provide some of the best available exposures on which to base description and interpretation. The facies of the fluviatile Doughend Sandstone shares many characteristics with the underlying Kelly Burn Sandstone of the Upper Old Red Sandstone, whereas that of the Foul Port Mudstone is distinct and unusual, attributed to local tectonics, influenced by movements on older and more major fractures such as the Highland Boundary Fault, with sediment accumulation taking place in a playa-lake complex of considerable extent.","PeriodicalId":49665,"journal":{"name":"Proceedings of the Yorkshire Geological Society","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Yorkshire Geological Society","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1144/pygs2020-002","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Among the important geological attributes of the small Cumbraes Basin in the southwestern off-shore Midland Valley of Scotland, the 4 km-long, fragmented but well-exposed section through the Devonian-Carboniferous boundary sequence in southern Great Cumbrae island ranks highly. In a continuous short stretch of the south and west coasts, large portions of this sequence are superbly preserved in tide-washed strandline surfaces and in old post-glacial sea cliff. This enhanced exposure leaves no doubt that the outcrops belong to two, immediately successive, members of the Kinnesswood Formation -- the lower the Doughend Sandstone, the upper the Foul Port Mudstone – and that they provide some of the best available exposures on which to base description and interpretation. The facies of the fluviatile Doughend Sandstone shares many characteristics with the underlying Kelly Burn Sandstone of the Upper Old Red Sandstone, whereas that of the Foul Port Mudstone is distinct and unusual, attributed to local tectonics, influenced by movements on older and more major fractures such as the Highland Boundary Fault, with sediment accumulation taking place in a playa-lake complex of considerable extent.
在苏格兰米德兰谷地西南部的小cumbres盆地的重要地质属性中,位于大Cumbrae岛南部的泥盆纪-石炭系边界层序中长4公里、破碎但暴露良好的剖面占有重要地位。在南海岸和西海岸的一段连续的短段中,该序列的大部分在潮汐冲刷的海岸线表面和古老的冰川后海崖中被完好地保存下来。这种增强的暴露毫无疑问地表明,这些露头属于Kinnesswood组的两个连续的成员——下部为Doughend砂岩,上部为犯规港泥岩——它们提供了一些最好的暴露,可以作为描述和解释的基础。道恩德(Doughend)流质砂岩相与上古红砂岩(Upper Old Red Sandstone)的凯利Burn砂岩(Kelly Burn Sandstone)具有许多共同的特征,而犯规港(Foul Port)泥岩的相则是独特而不寻常的,这是局部构造的结果,受高地边界断层(Highland Boundary Fault)等更古老、更主要裂缝运动的影响,沉积物聚集在相当程度上的湖湖复合体中。
期刊介绍:
The Proceedings of the Yorkshire Geological Society (PYGS) has been published without a break since 1839. It is one of the leading journals of British geology. Each year two parts are issued containing original research papers on all aspects of geology. Traditionally the Proceedings has given particular attention to the geology of northern England and its neighbouring areas. The submission of papers on related topics but of a more general interest is encouraged. All papers are subjected to the full scrutiny of two independent referees.