archaeological horizon

noun1

1. •
   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.

   • The Lochnore Phase is followed by the Shuswap Horizon, the first of three archaeological horizons that together comprise the Late Period of the Mid Fraser-Thompson River area. — 1996