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This review paper gives the major features of geoscience advances not only for the past 3 years but covering also t~e period further back in order to give a full picture of the development of geology in Vietnam. REGIONAL GEOLOGY INVESTIGATIONS In recent years investigation of the regional geology has been conducted mainly in the south e.g. compiling geological and mineral resources maps at scales of 1/500,000 and 1/200,000, since such maps have already been completed before 1975 for the north. Up till now almost the whole northern part of Vietnam has been covered by a geological map at a scale of 1/200,000 with an exception of two sheets located at the northern boundary with the China. Two thirds of the surface of Vietnam are now covered by geological maps at a scale of 1/200,000 and 8 percent covered by geological maps with a scale of 1/50,000. These are for certain areas with mineral potential. In the compilation of the geological maps with the above mentioned scales a series of combination works have been conducted e.g. panning of heavy detrital minerals, metallometric soil sampling of the areas to identify outcrops of mineral resources and assessment of their prospects. As a result a series of maps have been simultaneously compiled for a single area e.g. geologiCal, mineral resources, geomorphological, metallometric, panning and hydrogeological maps. The most remarkable achievement in regional geology investigation is a newly compiled set of geological maps at a scale of 1/500,000 covering the entire territory. This set of maps sufficiently reflects all the research results of regional geology investigation that have been done in Vietnam for nearly a century. The maps clearly show stratigraphic units in sedimentary basins. The division is based on studies of palaeontological collection material components, thickness of sedimentary and volcano-sedimentary formations and their geological structures. Based on petrochemical, geochemical studies and isotopic age dating analysis, all the intrusive complexes from the age of Archean to Cenozoic as well as metamorphic facies are clearly reflected on the maps. The relations between some igneous complexes and mineralization have been identified based on metallogenic studies. Due to difficulties in printing, the maps are still not available. In the last 3 years some advances in palaeontological and stratigraphic studies have also been made. The Camduong apatite-bearing suite, northern Vietnam, has been dated as Late Proterozoic-Early Cambrian by studies ofarcritarcha fossils, sedimentary formations from Cambrian to Devonian have been more precisely divided based on studies of trilobites, graptolites, coelenterates and brachiopods fossil collections. The sedimentary rocks of the Dalat

Recent advances in the knowledge of geology and mineral resources of Vietnam since 1981