Abstract
Hartmann and Cerva-Alves (2021) describe a field of silicified Cretaceous Paleodunes of the Botucatu Formation present in southernmost Brazil. In this comment, we explore pressing problems of their study and demonstrate that the authors inadequately use their data to support their conclusions. We evidence that: (1) the methodology misses basic information about the used datasets, as well as petrography and geochemistry data of the Botucatu sandstones; (2) the proposed silicification model is not supported by any petrographic or geochemical data; (3) the interpretations about dune morphology, wind pattern and direction are incorrect and differ from the available eolian record for the study region; and (4) the ‘explosive’ hydrothermal hypothesis for Cerro do Jarau site is based upon a not sustainable hydrothermal model that neglects substantial evidence for an impact origin for Cerro do Jarau and is broadly inconsistent with physical constraints.
Published Version
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