Environmental Archaeology of an Urban Defensive Area at the Time of the Roman Conquest: New Insights from a Hilltop Pond in Lugdunum (Lyon, France)

Abstract

ABSTRACT This study shows how fine and organic sediments in urban contexts can document landscape changes, anthropogenic activities and depositional processes. We focus on the transition between the late Iron Age and the Roman period in the city of Lyon (France), where an archaeological excavation conducted on Fourvière Hill aimed at understanding the evolution of a defensive site located south-west of the former Roman city. The discovery of a Gallic wall made of earth, wood and stone (murus gallicus) probably indicates the oppidum status of Lyon before the Roman colonisation. Fine-textured, organic and hydromorphic sediments containing a variety of artefacts (fine wares and amphora fragments) and abundant palaeoecological indicators (seeds, fruits, wood and charcoal fragments, pollen, shells, and parasites), were preserved at the foot of the rampart. A multidisciplinary study of these remains reveals the presence of a former hilltop pond surrounded by riparian woodlands with multi-proxy evidence of arable land or gardens, discharge from human settlements (consumption wastes, human parasites), and grazed areas (faecal inputs, animal parasites and plants tolerant to trampling). After several episodes of sediment inputs and backfill, the palaeoenvironmental record ended at the beginning of the Roman Empire, when a defensive wall was built over the site.