Abstract
The excavation of the hillfort of O Achadizo has brought to light several domestic structures intermingled with rubish heaps, belonging to the Iron Age Castro culture of NW Iberia. The abundant organic remains have constituted the basis for a systematic programme of radiocarbon dating of the different stratigraphic levels, which shows that the main occupation of the site took place between the VI and the II centuries cal. BC. Moreover, we have checked the 14C dates obtained from terrestrial samples (bones and charcoal) against those made on marine shells coming from the same strata. As a result, we have found that the latter have an apparent age of 316±I9 years, caused by the reservoir effect. Therefore, we stress the need for taking into account -and correcting whenever possible- such a deviation before using samples of marine origin for chronological purposes.
Highlights
The excavation of the hillfort of OAchadizo has brought to light several domestic structures intermingled with rubish heaps, belonging to the Iron Age Castro culture of NW Iberia
De esos propósitos sólo el segundo se reveló impracticable, a pesar del obvio interés que ello tendría, a causa de la imposibilidad de obtener una relación exhaustiva y secuencial de los artefactos recuperados en este castro en tiempo y forma para completar la redacción de este artículo
Aunque se ha descrito que AR es independiente del tiempo en primera aproximación, se han encontrado evidencias de variación de este valor asociado principalmente a cambios climáticos (3) o por aportes de aguas ricas en carbonatos inorgánicos de edad infinita procedentes de formaciones calcáreas (Heier-Nielstn et alii, 1995)
Summary
A Bajo Con. B Conchero B Conchero B Conchero A 2° pavimento I "pavimento. Relación de muestras datadas por carbono 14 para O Achadizo (Boiro, A Coruña). (*) Para las conchas, las fechas no se pueden calibrar directamente y deben ser corregidas por el efecto de la reserva mmndi.
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