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A Holocene record from a former coastal lagoon in Bahia Kino, Gulf of California, Mexico

Instituto de Geofisica, UNAM; Ciudad Universitaria, 04510 Mexico, D.F, Mexico maga{at}geofisica.unam.mx

M. C. Peinalba

Instituto de Ecologia, UNAM, Estacion Regional del Noroeste, Apdo. Postal 1354, Hermosillo 83000, Sonora, Mexico; Universidad de Sonora, Departamento de Geologia, Hermosillo 83000, Sonora, Mexico

M. Martinez

Instituto de Geofisica, UNAM; Ciudad Universitaria, 04510 Mexico, D.F, Mexico

B. Ortega-Guerrerol

L. Vazquez

Instituto de Geofisica, UNAM; Ciudad Universitaria, 04510 Mexico, D.F, Mexico

A 10-m-long core was recovered from the coastal flood plain on the eastern margin of the Gulf of California (Bahia Kino, Sonora). Sediments were analysed for loss-on-ignition, magnetic susceptibility, pollen, diatoms, ostracodes and foraminifera. Three levels were dated by ¹⁴C. The combined data suggest that the site was flooded during the middle Holocene as sea level increased. At about 6600 yr BP the area was a freshwater to brackish marsh dominated by Typha domingensis and Cyperaceae. Freshwater to brackish conditions suggest the presence of a local source of freshwater during this time and therefore a climate wetter than present. Continued rise in sea level was associated with an increase in depth and salinity. By c. 6350-6250 yr BP, the coring site was an inner lagoon, by c. 6125 yr BP a central lagoon and by c. 5900 yr BP the site was close to the mouth of the lagoon (lower lagoon). Lower lagoon conditions persistel until the top of the record, showing sea-level stabilization; which was followed by the formation of the dune ridge that presently separates the coring site from the sea.

Key Words: Sea-level change • diatoms • ostracodes • foraminifera • pollen • Sonora • Mexico • Holocene

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