51ae5311-a10a-b929-e063-3050940ab175 English dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-06-25 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608700 OSGB 1936 / British National Grid (EPSG::27700) Detrital zircon U-Pb ages from the Lower Jurassic of the Llanbedr (Mochras Farm) borehole, Wales 2026-05-08 creation http://data.bgs.ac.uk/id/dataHolding/13608700 The dataset contains detrital zircon U-Pb ages for the Llanbedr (Mochras Farm) borehole, from the Lower Jurassic. The U-Pb zircon age analyses was carried out on the SHRIMP IIe/MC instrument (the sensitive high resolution ion microprobe) at the Polish Geological Institute, Warsaw. Data relate to the Llanbedr (Mochras Farm) Borehole drilled in 1967-1969 near the village of Llanbedr, NW Wales, SH 5533 2594. The aim for generating these data was to provide evidence for sediment provenance to the Llanbedr (Mochras Farm) site during the Early Jurassic. Publication in press, Jiang et al. (2026) Laurasian Seaway history during the Early Jurassic from quantitative mineralogy and detrital zircon dating. Paleoceanography and Paleoclimatology. Stephen Hesselbo University of Exeter Camborne School of Mines Penryn Campus Penryn Cornwall TR10 9FE not available originator Mengjie Jiang University of Exeter Postgraduate not available originator Dr Clemens V Ullmann University of Exeter Proleptic Lecturer not available originator G Pieńkowski Polish Geological Institute not available originator E Krzemińska Polish Geological Institute not available originator A Uchman Jagiellonian University not available originator D Salata Jagiellonian University 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 originator Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/51ae5311-a10a-b929-e063-3050940ab175.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Detrital minerals Uranium thorium lead dating Jurassic Radiometric dating BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data Citable 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]" vector English geoscientificInformation British Geological Survey Gazetteer: OS gazetteer 2002 revision Mochras [id=1363361] -4.1471 -4.1471 52.8109 52.8109 2019-01-01 2023-01-01 MS Excel 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 United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item192142 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/386344e4-b0bf-4014-92a3-1f11c0ef2e3a WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Jiang, M., Hesselbo, S. P., Pieńkowski, G., Krzemińska, E., Riding, J. B., Uchman, A., Salata, D., Ullmann, C. V. (2026). Detrital zircon U-Pb ages from the Lower Jurassic of the Llanbedr (Mochras Farm) borehole, Wales. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/386344e4-b0bf-4014-92a3-1f11c0ef2e3a information 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 The U-Pb zircon age analyses were conducted on the SHRIMP IIe/MC instrument (the sensitive high resolution ion microprobe) at the Polish Geological Institute, Warsaw, using a duoplasmatron as primary ion source. The measurements were performed during two independent cycle-sessions, but according to the same procedure and settings. Secondary ions were collected on a single electron multiplier by cycling the magnet through six scans on nine masses: 196Zr2O, 204Pb, 204.1 (as a background), 206Pb, 207Pb, 208Pb, 238U, 248ThO, and 254UO. Common-Pb corrections for unknown samples were based on measured 204Pb. The isotopic composition was calculated using the Pb isotopic evolution model of Stacey and Kramers (1975), and the time corresponding to the preliminary 206Pb/238U age was calculated using the default common-Pb compositions.