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 as well as do outings. The Ña Blanca Country House, by the Tagatija Guazú, is the center attraction, a stream of crystal clear water, with small waterfalls, where tourists can go swimming and camping. The JM Ranch has an ample beach by the river and is a nice place to enjoy camping and fishing. Alto Biobio is one of the most scenic places and is right by the River Biobio 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