The Lower Cretaceous (Valanginian to Barremian-Aptian?) sedimentary rocks of the Ataeama region have been grouped into the Chañarcillo Group by Segerstrom (1961) and Corvalan (1974). They have been interpreted as one continuous sedimentary cycle, in which the transgression (Valanginian) depicts the beginning of the second marine cycle in the Andine development, while the regression (Aptian?) represents the end of the marine influence in the Andine development and the beginning of a predominantly continental environment in the Upper Cretaceous.
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- Geologic Evolution of the Atacama Basin During the Lower Cretaceous
M. E. Cisternas
L. L. Diaz
- Springer Berlin Heidelberg