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Revista de la Sociedad Científica del Paraguay
Print version ISSN 0379-9123On-line version ISSN 2617-4731
Abstract
GADEA, Moisés et al. Columnar siltstones display on the northeast border of the Asuncion Rift in the City of Limpio. Rev. Soc. cient. Parag. [online]. 2020, vol.25, n.2, pp.121-130. ISSN 2617-4731. https://doi.org/10.32480/rscp.2020.25.2.121.
Coincident with one of the main faults of the Asuncion rift, it is exposed a small elevation dome shaped, constituted by columnar sandstones cerro Koĩ likewise on the border of the river Salado valley. The columnar prisms shows great development of their sides and dimensions, where it is supposed an alkaline igneous body underneath (same as their regional congeners) as responsible of the thermic effect and mechanical contraction due to water loss off the clastic material, for the growth and evolution of the columnar jointing. It is ascertained an abandoned quarry certainly depredated.
Keywords : columnar sandstones and siltstones; rift of Asunción; nephelinites.