DOI: http://dx.doi.org/10.5027/andgeoV33n2-a07

Finding of a Holocene marine layer in Algarrobo (33°22'S), central Chile. Implications for coastal uplift

Alfonso Encinas, Francisco Herve, Rodrigo Villa-Martinez, Sven N. Nielsen, Kenneth L. Finger, Dawn E. Peterson

Abstract


A buried Holocene marine bed was discovered upon drilling a water well in Algarrobo (33°22'S), located on the coast of central Chile. Radiocarbon dating of a wood fragment found within the deposit indicates an age of 6450 cal yr BP. The top of this bed, 0.25 m-thick, was reached at an elevation of 3.8 m above mean sea level. This bed contains abundant monospecific faunas of foraminifers (Ammonia tepida) and ostracodes (Cyprideis beaconensis), indicative of deposition in a very shallow, transitional marine environment. Palynologic analysis reveals a Chenopodiaceae-dominated (~70%) assemblage, indicating a relatively arid and warm climate.


How to cite this article Encinas, A.; Herve, F.; Villa-Martinez, R.; Nielsen, S.; Finger, K.; Peterson, D. 2006, Finding of a Holocene marine layer in Algarrobo (33°22'S), central Chile. Implications for coastal uplift. Revista Geológica de Chile 33 (2) : 339-345. [doi:https://dx.doi.org/10.5027/andgeoV33n2-a07]