Hoabinhian is a lithic techno-complex of archaeological sites associated with assemblages in Southeast Asia from late Pleistocene to Holocene, dated to c.10,000–2000 BCE. It is attributed to hunter-gatherer societies of the region and their technological variability over time is poorly understood. In 2016 a rockshelter was identified in Yunnan (China), where artifacts belonging to the Hoabinhian technocomplex were recognized. These artifacts date from 41,500 BCE. Bacsonian is often regarded as a variation of the Hoabinhian industry characterized by a higher frequency of edge-grounded cobble artifacts compared to earlier Hoabinhian artifacts, dated to c. 8000–4000 BCE. Definition The term Hòa Bình culture (, in French culture de Hoà Bình) was first used by French archaeologists working in Northern Vietnam to describe Holocene period archaeological assemblages excavated from rock shelters. The related English adjective Hoabinhian (French hoabianien) became a common term in the English-based literature to describe stone artifact assemblages in Mainland Southeast Asia that contain flaked, cobble artifacts. The term was originally used to refer to a specific ethnic group, restricted to a limited period with a distinctive subsistence economy and technology. More recent work (e.g., Shoocongdej 2000) uses the term to refer to artifacts and assemblages with certain formal characteristics. History In 1927, Madeleine Colani published some details of her nine excavations in the northern Vietnamese province of Hòa Bình. As a result of her work the First Congress of Prehistorians of the Far East in 1932 agreed to define the Hoabinhian as: a culture composed of implements that are in general flaked with somewhat varied types of primitive workmanship. It is characterised by tools often worked only on one face, by hammerstones, by implements of sub-triangular section, by discs, short axes and almond shaped artefacts, with an appreciable number of bone tools (Matthews 1966). Despite the general terms of the definition, Colani's Hoabinhian is an elaborate typology as indicated by the 82 artefacts from Sao Dong that Colani classified into 28 types (Matthews 1966). The original typology is so complicated that most Hoabinhian sites are identified simply by the presence of sumatraliths (White & Gorman 1979). The chronology of Hoabinhian artifacts was assumed to be Holocene because of the extant fauna found in the assemblages and the absence of extinct fauna by Colani and others working before the availability of radiocarbon dating methods in the 1950s. Problems with Colani's typology were exposed by Matthews (1964) who analysed metric and