{"title":"Palynology of the Lower Cretaceous Hundleby Clay Member of the Claxby Ironstone Formation in eastern England and its biostratigraphic and palaeoenvironmental significance","authors":"\tSociety\t\t\tD. Stead, D. Batten","doi":"10.1144/PYGS2018-006","DOIUrl":"https://doi.org/10.1144/PYGS2018-006","url":null,"abstract":"Palynomorph assemblages recovered from five samples of the Hundleby Clay Member of the Claxby Ironstone Formation contain abundant dinoflagellate cysts and miospores (spores and pollen grains). The cyst assemblages are sufficiently diverse to enable an age determination of early Valanginian for all five samples, although it is possible that evidence from the highest two samples indicates a younger age, but no younger than earliest Hauterivian. The miospore assemblage is consistent with these suggestions. A close comparison can be made with palynomorph assemblages from the Speeton Clay Formation at outcrop in East Yorkshire, and indicates a possible correlation with Beds D4–D3 ( Paratollia – Polyptychites ammonite zones), supporting the age determination. The overall composition of the palynological matter recovered from each sample, i.e. their palynofacies, suggests that the whole of the sedimentary succession accumulated in a nearshore marine setting, with deposits at the base of the exposure (samples 1 and 2) reflecting a more distal shelf environment than those from higher up and at the top of the section examined (samples 4, 5 and 3).","PeriodicalId":49665,"journal":{"name":"Proceedings of the Yorkshire Geological Society","volume":"17 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77165824","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 trace fossil Zoophycos Massalongo in the Carboniferous (Mississippian) of Alnmouth, Northumberland","authors":"\tSociety\t\t\tS. Donovan","doi":"10.1144/PYGS2018-001","DOIUrl":"https://doi.org/10.1144/PYGS2018-001","url":null,"abstract":"The Mississippian strata of England and Wales, mainly limestones, are rich in body fossils, but deficient in trace fossils. Herein, a coastal locality rich in the spiral burrow Zoophycos isp. is described from Alnmouth, Northumberland. Although originally reported in 1930, this site and its trace fossils are only illustrated and described in detail for the first time herein. The locality is in the Lower Foxton Limestone, Stainmore Formation, Yoredale Group; Arnsbergian substage, Namurian stage, Mississippian. Zoophycos isp. are common on two bedding planes, the lower of which exposes c . 460 m 2 . Traces are flat, plume-like and preserved in negative epirelief. Spreiten are fine to coarse and outline of the burrow varies from circular to more rectangular. Specimens are numerous, but water-worn and poorly preserved. The Lower Foxton Limestone was likely deposited in a shallow water setting. Trace fossils in Mississippian limestones remain problematic, but this is most probably due to a combination of taphonomic, palaeoenvironmental and collector bias, or a mixture of all three. That is, what is difficult to collect fails to find its way into collections, survey, university, museum or private, and, ultimately, into print. They are there, but they offer many problems for the collector.","PeriodicalId":49665,"journal":{"name":"Proceedings of the Yorkshire Geological Society","volume":"55 6 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89174976","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}
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