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Calcretas nodulares. A: Acercamiento a los nódulos. B: Agregados. C: Revestimientos de arcilla alrededor de granos de calcita. Obsérvese que sobre un grano de calcita crece calcita acicular. D: Revestimiento de arcillas de un grano volcánico. Las flechas en C y D señalan las coberturas de arcilla.  

Calcretas nodulares. A: Acercamiento a los nódulos. B: Agregados. C: Revestimientos de arcilla alrededor de granos de calcita. Obsérvese que sobre un grano de calcita crece calcita acicular. D: Revestimiento de arcillas de un grano volcánico. Las flechas en C y D señalan las coberturas de arcilla.  

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Paleosols and sedimentological studies are useful tools in the reconstruction of past environments; they are also used as stratigraphic markers for correlation in small areas or for determining the rate of deposition. The oldest known paleosols are from the Precambrian, however the most studied are those from the Quaternary. The purpose of this wor...

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