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Holocene aeolian phases and human settlements along the Atlantic coast of southern Spain

Area de Geografia Física, Facultad de Humanidades, Universidad de Huelva, 21007 Huelva, Spain

Cari Zazo

Departamento de Geología, Museo Nacional de Ciencias Naturales–CSIC, c/José Gutiérrez Abascal 2, 28006 Madrid, Spain

Cristino J. Dabrio

Departamento de Estratigrafia e Instituto de Geología Económica–CSIC, Facultad de CC. Geológicas, Universidad Complutense, 28040 Madrid, Spain

Fernando Díaz del Olmo

Facultad de Geografia e Historia, Cátedra de Geografia Física, Universidad de Sevilla, c/María de Padilla s/n; 41001-Sevilla, Spain

José Luis Goy

Departamento de Geología (Geodinámica), Facultad de Ciencias, Universidad de Salamanca, 37008 Salamanca, Spain

Javier Lario

Departamento de Geología, Museo Nacional de Ciencias Naturales–CSIC, c/José Gutiérrez Abascal 2, 28006 Madrid, Spain; Departamento de Geología (Geodinámica), Facultad de Ciencias, Universidad de Salamanca, 37008 Salamanca, Spain

A combined geomorphological, radiocarbon dating, archaeological and historical approach permits a refining of the age of the coastal dune systems related to estuaries in the Gulf of Cádiz. Three dune systems are distinguished in this paper. The oldest one, D1, which accumulated under prevailing WSW winds during the first millennium bc, overlays both the occupational horizons of Late Neolithic-Early Copper Age (fourth millennium bc) and the‘lithic workshop levels' (fourth to second millennia bc). The middle dune system, D2, containing both Roman and medieval remains, accumulated between the thirteenth or fourteenth centuries and the seventeenth century ad. The youngest D3 system is associated with the time of building of watchtowers in the seventeenth century ad but extends to the present; it is related to SW prevailing winds. We explain the absence of aeolian deposits prior to 2700 cal. BP as the result of trapping of a large part of the sediment supply in the estuaries, which starved the neighbouring beaches and aeolian settings. Aeolian accumulation reached significant values when sedimentation in the coastal zone changed from being mainly aggradational in the estuaries (6500–2700 cal. BP) to mainly progradational in spit barriers and related dunes (post 2700 cal. BP). The present analysis of aeolian systems suggests a non-direct correlation, at least in some cases, between coastal progradation of spit barriers and aridity.

Key Words: Foredunes • aeolian sheets • dunefield • spit barrier • radiocarbon dating • historical evidence • archaeological evidence • climatic change • sea-level change • Gulf of Cadiz • Spain • late Holocene

The Holocene, Vol. 9, No. 3, 333-339 (1999)
DOI: 10.1191/095968399668924476


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