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In september 2018, the DIME portal was officially launched to facilitate the user driven recording of metal detector finds produced by members of the public. The concrete and operational aim of DIME is to provide a portal for the registering and hence safeguarding of the increasing number of metal detector finds and to make them accessible for the general public and for research. The more overarching vision behind the DIME project is to realise the potential of recreational metal detecting as a medium to implement an inclusive and democratic approach to heritage management in Denmark and to advance the incorporation of principles of citizen science and crowdsourcing in museum practice. This article intends to present the background of the DIME portal’s development, its basic functionalities and their technological underpinning as well as the overarching vision behind DIME.
This paper presents a study of past coastline dynamics and their consequences for prehistoric societies living in the glacio‐isostatically uplifted central Limfjord area, northern Denmark. The consequences of the gradual relative sea level (RSL) changes have been investigated to develop a local RSL curve, study settlement patterns on newly exposed marine foreland, and estimate changes in the area and quality of grazing and forage for livestock. This was achieved by a multidisciplinary approach involving existing regional and local beach ridges dated by optically stimulated luminescence, a comprehensive database of archaeological finds, and extrapolation based on a digital elevation model. The beach‐ridge dates suggested a near‐linear local RSL change in the study area of ~1.2±0.2 m per 1000 years for the last 3000 years. Based on this, a palaeo‐coastline development model was produced that correlated well with a comprehensive database of archaeological finds. The model indicates that (i) few human settlements moved to the newly exposed marine foreland prior to modern times, though clusters of burial mounds (barrows) suggest that some of the new lands were colonized during the Late Roman Iron Age until 400 CE, (ii) winter‐flooded marine foreland with high‐quality livestock grazing increased steadily until c. 750 CE and then remained stable at approximately 150 km2, and (iii) due to high salinity of the inundating water, the palaeo‐Limfjord probably had Wadden Sea‐like fertile saltmarshes until c. 1 CE. The improved chronologies yield a better understanding of the spatial and temporal prehistoric human–nature interactions in the study area. The findings highlight the need for accurate local RSL curves in order to interpret concomitant terrestrial environment drivers and trajectories, and thereby understand causal relationships and consequences for prehistoric human–environment interactions in coastal areas.
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