Archaeological evidences on early peopling in the fluvio-volcanic Pereira-Armenia fan (Colombia): Volcanic activity influence on cultural adaptation and depopulation events

Abstract Archaeological research in the Middle Cauca region of west-central Colombia over the past 20 years has produced new information regarding early preceramic archaeology and environmental changes in the Central Cordillera landscapes. Stratigraphic, sedimentological, and geomorphic studies provided important contextual information for locating and interpreting the region's earliest archaeological sites, from a geoarchaeological perspective. This article presents results on the Pereira-Armenia Fluvio-Volcanic Fan studies and surrounding areas, during the Late Pleistocene through Middle Holocene periods. Twenty-five archaeological sites with preceramic deposits were tested and some have been excavated in a region measuring 30 b y 100 km. The region contains data with occupations ranging dates from approximately 13,540 to 3600 14C years BP (Aceituno, 2019; Dickau, 2015). These sites included cultural and natural deposits, within in situ tephras and polygenic soils with buried soil sequences. Cultural materials, sediments and soils from these sites have the potential to yield important data about the processes of site formation, environmental adaptation, early subsistence, depopulation and lithic technology in the Middle Cauca region. Layers of volcanic ashes demonstrated that in areas proximal to the Cerro Bravo-Cerro Machin Volcanic Complex, humans suffered impacts. However, depopulations was not generalized. In some places in the Fluvio-Volcanic Fan, far enough form volcanic impacts, people could stay.