Geology of Paraguay Basin. These tholeiites were erupted in the Early Cretaceous in association with the initial opening of the South Atlantic. The Cretaceous volcanism did also created minor outcrops of potassic alkaline volcanics in a graben structure developed between Asunción and Villarrica and in Amambay Department. Cretaceous volcanism did also left small units of sodic alkaline rocks in Misiones Department in southern Paraguay. Geology of Paraguay The country of Paraguay lies geologically at the borderzone between several cratons. Due to thick Cenozoic sediment cover and regolith development few outcrops are available in Paraguay. East of Paraguay River that Precambrian and Early Paleozoic
Concepción Department, Paraguay Concepción Department, Paraguay Concepción () is a department of Paraguay. The capital is the city of Concepción. Throughout history, this department has suffered a great amount of population instability, especially in the times of the colony, due to the advance of the Brazilian “bandeirantes” through the east and the attacks of the Mbayá – Guaicurú natives of Chaco, which, by then, were the lords of that region. During the later years of the colony, it was organized a great campaign to re-conquest the invaded territories with the intention of defending by populating the region and also with the important task