Estratigrafia e estrutura do Cerro do Jarau: nova proposta

3D gravimetric investigation of the Cerro do Jarau structure, Rio Grande do Sul, Brazil

“…The negative anomaly in the central area is slightly larger than the proposed laminated sandstone unit in Sánchez et al. (), and the positive circular anomaly begins to show up in the homogeneous sandstone domain, reaching out to the region of basaltic units. Larger density values are expected for the basaltic unit anyway, but based on the density values calculated for rock samples of the structure, the presence of Serra Geral basalts located beneath silicified sandstone bodies is suggested, being this transition expressed in the circular positive anomaly observed.…”

“…) proposed by Sánchez et al. (). It should first be noted that the limit between the sandstone formation in the center and the other sandstone that surrounds it is only inferred due to lack of outcrops, as in the case of the limit between Guará and Botucatu sandstones in the geological map proposed by Crósta et al.…”

“…In a more recent study of the area, Sánchez et al. () interpreted the local geology without associating the observed sandstones in the structure with the stratigraphy of the region, proposing that the sandstones are actually positioned above the Serra Geral basalts, and not below. According to their interpretation, the geological map (Fig.…”

“…Nonetheless, Sánchez et al. () interpret Cerro do Jarau as the basal portion of an impact crater with patterns that do not adjust to the models of simple or complex crater formation (sic).…”

“…Geological map of the Cerro do Jarau, as proposed by Sánchez et al. () (Color figure can be viewed at www.wileyonlinelibrary.com. )…”