This report is a description of the 1:25 000 scale Hatta geological map sheet. It forms part of the published outputs from a contract between the United Arab Emirates Federal Government (Ministry of Energy) and the British Geological Survey (BGS) to produce geological maps, at various scales, of the solid and drift geology of the eastern part of the United Arab Emirates. These maps, which have accompanying Sheet Explanations, are listed below.\ud Geological surveying of the Hatta Sheet was completed in three winter field campaigns carried out between October to December and January to March of 2002-2005. Field data were recorded on transparent overlays on 1:25 000 scale colour aerial photographs, used in conjunction with LANDSAT imagery and 1:50 000 topographic maps. The field data were transferred onto gridded transparent overlays on geo-rectified LANDSAT images at 1:25 000 scale. \ud Geological mapping of the Hatta district was carried out by M T Styles (ophiolite), R J Thomas (ophiolite, Hatta Zone west, metamorphic rocks), E R Phillips (Hatta Zone east and west, metamorphic rocks), D I Schofield, K M Goodenough (ophiolite), and, A R Farrant contributing to mapping of the Quaternary deposits. Petrographical analyses were completed by E R Phillips, R J Thomas, M T Styles and K M Goodenough on samples collected by the mapping team. The Sheet Explanation was compiled by E R Phillips and R J Thomas.\ud The word ‘district’ is used here to refer to the area represented by the geological map 1:25 000 series sheet Hatta. The grid references in the text are UTM Zone 40 using the Nahrawan datum, given in the form [0419633 2826172]. Symbols in brackets after lithostratigraphic names refer to symbols used on the 1:25 000 series geological map. Refrences to other Sheet Explanations in these series are given by Sheet name and number (e.g. Fujairah Sheet, 50-4).\u
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