The present volume originated in session A25b ('Current Approaches to Collective Burials in the Late European Prehistory') of the XVII World Congress of the International Union of the Prehistoric and Protohistoric Sciences (UISPP), held in Burgos in September 2014. Collective burials are quite a common feature in Prehistoric Europe, with the gathering of multiple individuals in a shared burial place occurring in different types of burial structures (natural caves, megalithic structures, artificial caves, corbelled-roof tombs, pits, etc.). Such features are generally associated with communities along the agropastoralist transition and fully agricultural societies of the Neolithic and Chalcolithic. For a long time, human skeletal remains exhumed from collective burials were dismissed as valuable sources of information, their studies being limited mostly to morphological assessments and subsequent classification in predefined 'races'. They currently represent a starting point for diversified, often interdisciplinary, research projects, allowing for a more accurate reconstruction of funerary practices, as well as of palaeobiological and environmental aspects, which are fundamental for the understanding of populations in the Late Prehistory of Europe and of the processes leading to the emergence of agricultural societies in this part of the world. The articles in this volume provide examples of different approaches currently being developed on Prehistoric collective burials of southern Europe, mostly focusing on case studies, but also including contributions of a more methodological scope.

The MegaGeo project, under the direction of the late Rui Boaventura, aimed to analyse the raw material economy in the construction of megalithic tombs in multiple territories, showing the representation of several prehistoric communities that raised them and their relationship with the surrounding areas. Following the meeting of the previous year, it was decided to hold Mega-Talks 2, which brought together national and international experts who have developed work related to Megalithism and Geology, in its various perspectives, from the funerary depositions to the raw material construction of the tombs, as indicators of mobility and interaction with the surrounding physical environment. Megaliths and Geology: Megalitos e Geologia presents contributions from Mega-Talks 2, held in Redondo, Portugal, on 19-20 November 2015.