This article is the preface of the special issue "Quaternary research in times of change – inspired by INQUA Roma 2023". It is a result of the XXI INQUA Congress held in Rome in July 2023. It briefly presents the nine contributions published in this volume.

This paper presents the current state of research on mining history in the Selke River catchment as part of the eastern Harz vein district. We used different archives to compile and localise information about former mines/mining fields and smelting sites. The extraction and operation periods of these sites provide further information on possible signals in the overbank deposits due to mining activity, providing a basis for further analysis and interpretation of alluvial deposits.

Drillings, outcrops, and seismic data provide insights into a glacial basin and a former river channel in northern Switzerland. Both are infilled with diverse (glacial, lacustrine, fluvial, colluvial) sediments attributed to three separate glaciations. The depth of the glacial basin depends strongly on the underlying rock type, which together with (hydro)fractures provides evidence on the conditions and erosion processes at the ice–rock interface.

This study presents a quantitative reconstruction over a 235-year time frame of the development of the natural Donaumoos fen and Danube River into an anthroposphere. The selected proxies are the Donaumoos drainage ditch length and the Danube surface water area traced through the multi-temporal analysis of old maps. A comparison of quantitative proxies with the state of research from written sources leads to the discovery of potential great transitions in floodplain and peatland transformation.