Publication: Comment on “Formation of chenier plain of the Doñana marshland (SW Spain):
Observations and geomorphic model” by A. Rodríguez-Ramírez and C.M.
Yáñez-Camacho [Marine Geology 254 (2008) 187–196]
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2010
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Elsevier
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Abstract
Rodríguez-Ramírez and Yáñez-Camacho (2008), Rodríguez-Vidal et al. (2009) and Rodríguez-Ramírez et al.
(2009) have kept an ongoing discussion about the validity of radiocarbon ages in reconstructing Holocene
palaeogeographical models in the Gulf of Cadiz. The discussion considered the validity and correctness of the ΔR
value to beused in the area to calibrate radiocarbon ages ofmarine samples. These papers suggest that theΔR value
proposed by Lario (1996) and Dabrio et al. (1999, 2000) is erroneous, and consequently, that all the evolutionary
models based on radiocarbon ages from marine samples that have been proposed in this area since 1996 must be
revised.However, the papers commentedhere use erroneously the R, regional R andΔR values.After reviewing the
published data, it is apparent that the most reliable values of ΔR in the Gulf of Cadiz for middle-late Holocene
samples range between ΔR=35±85 yr and ΔR=95±15 yr. This means that the values used in Lario (1996) and
Dabrio et al. (1999, 2000) fall in this range, and also that the calibrated ages used by several authors adopting these
values are fully reliable. Calibrations using ΔR values inside this range do not yield significant differences in terms
of geological age owing to the magnitude of errors resulting from the methods employed.