Geological Curator最新文献_第4页

Large reptiles, localised solutions: investigating alternative delivery systems for the treatment of oversized pyritic specimens 大型爬行动物，本地化解决方案:研究超大黄铁矿标本处理的替代递送系统

Geological Curator Pub Date : 2020-06-01 DOI: 10.55468/gc1489

L. Petrera, L. Allington-Jones, K. Miles

引用次数: 0

Source of Roman stone for Aquae Sulis (Bath, England): field evidence, facies, pXRF chem-data and a cautionary tale of contamination 苏利斯湖(英国巴斯)罗马石的来源:现场证据，相，pXRF化学数据和污染的警示故事

Geological Curator Pub Date : 2020-06-01 DOI: 10.55468/gc1490

M. Tucker, M. Brisbane, D. Pitman, O. Kearn

{"title":"Source of Roman stone for Aquae Sulis (Bath, England): field evidence, facies, pXRF chem-data and a cautionary tale of contamination","authors":"M. Tucker, M. Brisbane, D. Pitman, O. Kearn","doi":"10.55468/gc1490","DOIUrl":"https://doi.org/10.55468/gc1490","url":null,"abstract":"The Roman town of Bath (Aquae Sulis), renowned for its Temple to Minerva and thermal baths complex, is estimated here to have required around 500,000 m3 of stone for its construction. This huge amount of stone was likely to have been supplied from quarries within 5 km of the town, located towards the tops of the hills around Bath. Observations at the many old quarries show few features indicating Roman exploitation except for one Lewis bolt-hole and reports of chisel marks. The features of the majority of the stone in the Roman Baths-Temple Complex all suggest that the stone was sourced largely from the Combe Down Oolite Member (CDO; Jurassic, Bathonian stage), rather than the Bath Oolite Member (BO), of the Great Oolite Group. A portable X-Ray Fluorescence (pXRF) instrument, used to determine the trace element geochemistry of Bath Stone for comparison with the Roman stone, shows that the CDO and BO are very similar, except for different contents of Si, Al, Fe and Mn. These likely reflect variations in clay and organic matter content. However, with regard to the Roman stone and sculptures in the Baths-Temple Complex, all analyses of surfaces show enrichment in virtually all elements, but especially in P, Si, K, Al, S, Cl, Fe, Pb, Zn, Nb, and As. This contamination is largely attributed to the buried nature of the site (5�8 metres) from the 5th century AD until the end of the 19th century, during which time the stone would have been affected by groundwater, mostly derived from the hot-springs, with its high content of many elements. Analyses of cores cut into blocks of Roman stone show that the contamination is absent after 1�2 cm. This study demonstrates that care must be exercised in using geochemical analyses of ancient building materials for provenance studies, and that fresh surfaces of the material may well be required.","PeriodicalId":203203,"journal":{"name":"Geological Curator","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121021492","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: 0

Preparing detailed morphological features of fossil brittle stars (Ophiuroidea, Echinodermata) for scanning electron microscopy using a combination of mechanical preparation techniques 结合机械制备技术为扫描电镜制备蛇尾化石(蛇尾总科，棘皮科)的详细形态特征

Geological Curator Pub Date : 2020-01-27 DOI: 10.55468/gc1491

M. Graham, T. Ewin

{"title":"Preparing detailed morphological features of fossil brittle stars (Ophiuroidea, Echinodermata) for scanning electron microscopy using a combination of mechanical preparation techniques","authors":"M. Graham, T. Ewin","doi":"10.55468/gc1491","DOIUrl":"https://doi.org/10.55468/gc1491","url":null,"abstract":"The comprehensive taxonomic study of fossil brittle stars (Echinodermata: Ophiuroidea) requires the plates of the disk and arms to be cleared of matrix as fully as possible to reveal significant characters, such as spine articulations, ornament and clear plate boundaries. However, this needs to be done delicately, as the plate surfaces and boundaries are fragile and easily obliterated when only using air abrasive techniques. Ophiuroid fossils are frequently over-prepared, which becomes apparent particularly when examined by scanning electron microscopy (SEM), hampering taxonomic studies. Preparation may be further complicated by the entanglement of the arms of multiple individuals. In order to facilitate detailed SEM analysis of recently available, undescribed fossil ophiuroid material from the Aptian, Lower Cretaceous, Atherfield Clay Formation of the Isle of Wight, Hampshire, UK a combination of careful mechanical preparation techniques was employed to great effect. Specimens were initially exposed using standard air abrasive techniques, but the final few millimetres of matrix were removed using pins. To get individual arm pieces exceptionally clear of matrix, they were removed from the blocks using a mini pedestalling technique and then further cleaned using an ultrasonic pen. This combination of techniques fully exposed all the elements required for full taxonomic study without causing severe damage to the plate surfaces and greatly improved the overall aesthetic of the specimens. These techniques could be more widely applied in fossil preparation.","PeriodicalId":203203,"journal":{"name":"Geological Curator","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129622498","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: 0

Compactor storage for the fossil marine reptile collections at the Natural History Museum 自然历史博物馆海洋爬行动物化石的压缩储存

Geological Curator Pub Date : 2019-12-01 DOI: 10.55468/gc1481

L. Stevens, S. Chapman, C. Hughes

引用次数: 0

Presentation of the A.G. Brighton Medal to Monica Price, December 2019 2019年12月，莫妮卡·普莱斯获得A.G.布莱顿奖章

Geological Curator Pub Date : 2019-12-01 DOI: 10.55468/gc1486

M. Parkes

引用次数: 0

45th Annual General Meeting 第45届年度股东大会

Geological Curator Pub Date : 2019-12-01 DOI: 10.55468/gc1485

Geological Curators' Group