Asunción arch
The Asunción arch is a basement high in Paraguay and nearby areas of Argentina that makes up the modern western boundary of Paraná Basin. Asunción arch thought to be a forebulge developed as result of the piling up of material in Bolivia and the Argentine Northwest during the Andean orogeny in the Cenozoic Era.
Along Paraguay Asunción arch has a north-south direction parallel to Paraguay River. To the south of Paraguay Asunción arch runs in a S-SW direction and be traced no further south than to Corrientes Province. A flatter and broader second branch of the Asunción arch runs from southern Paraguay the SE linking up with Río Grande arch in Brazil.
