The story
From archaeological + horizon (“layer or stratum, subculture”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A common set of artefacts that identifies a culture and is found disseminated widely (usually over a number of sites, but sometimes widely over one site) but restricted to a single stratum; a layer or stratum. Full definition →
From archaeological + horizon (“layer or stratum, subculture”).
Etymology from Wiktionary, CC BY-SA 4.0.