b5a67555-ae07-3623-e054-002128a47908 English dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-05-03 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13607694 OSGB 1936 / British National Grid (EPSG::27700) Intra-crystalline protein degradation dating of proboscidean enamel from the UK (NERC Grant NE/K500987/1) 2020-11-27 creation http://data.bgs.ac.uk/id/dataHolding/13607694 The concentration of both L and D amino acid isomers was determined by HPLC (High-performance liquid chromatography) for multiple amino acids. 30 samples of proboscidean enamel were taken from the collections at BGS. Samples of enamel (~30 mg) was removed from the teeth of proboscideans using a small electric drill. All of the samples were from UK sites dating to the Quaternary. These samples were used to build a regional geochronology based on the extent of racemisation of amino acids from the intra-crystalline fraction (Dickinson, 2018). Thesis http://etheses.whiterose.ac.uk/22261. A published paper 'A new method for enamel amino acid racemization dating: A closed system approach' is also available; https://doi.org/10.1016/j.quageo.2018.11.005 Marc Dickinson University of York Chemistry Department York YO10 5DD not available originator Enquiries British Geological Survey 0115 936 3143 0115 936 3276 Environmental Science Centre, Nicker Hill, Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk distributor Enquiries British Geological Survey 0115 936 3143 0115 936 3276 Environmental Science Centre, Nicker Hill, Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/b5a67555-ae07-3623-e054-002128a47908.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Age determination methods Racemization dating Geochronology BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data dataCentre NERC_DDC otherRestrictions licenceOGL Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" otherRestrictions The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" textTable English geoscientificInformation ISO 3166_1 alpha-3 2009 revision ENG British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus 1979 creation ENGLAND [id=150000] 0.0700 1.7000 51.4400 52.9200 2017-05-08 2018-07-01 Image (JPEG) Microsoft Excel witheld Enquiries British Geological Survey 0115 936 3143 0115 936 3276 Environmental Science Centre, Nicker Hill, Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk distributor http://etheses.whiterose.ac.uk/22261 information https://doi.org/10.1016/j.quageo.2018.11.005 WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) information https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item139845 WWW:DOWNLOAD-1.0-http--download Data download dataset dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false Samples of enamel (~30 mg) were powdered and exposed to NaOCl (12%) for 72 h. The NaOCl was removed and the powdered enamel was washed 5X with water and 1X with MeOH. Powdered enamel samples were split into 2 fractions. One sample was treated for their free amino acid (FAA) content and the other their total hydrolysable amino acid (THAA) content. THAA samples were dissolved in HCl (7M) and heated at 110 ̊C for 24 h. THAA samples were re-dissolved in HCl (1 M, 20 μLmg−1) and FAA samples were demineralised in HCl (1 M, 25 μLmg−1). KOH (1 M, 28 μLmg−1) was added to the acidified solutions. The sample was centrifuged for 10 min causing a clear supernatant to form above a gel; the biphasic separation. The supernatant was extracted and dried by centrifugal evaporation and analysed by HPLC. All methods are outlined in Dickinson et al., 2019.