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
Alto Paraguay Department Chaco at over 200.000 hectare for 2008 alone The department's most important activity by far is cattle ranching, both extensive in the savannas of the east and intensive on the planted pastures of cleared land. Cultivation of sorghum, sugar cane and (in planning stage as of January 2009, for the arid west) jatropha are very recent developments. The department is divided into five districts: Alto Paraguay Department Alto Paraguay (; "Upper Paraguay") is a sparsely populated department of Paraguay. The capital is the town of Fuerte Olimpo. In 1992 the Chaco Department was merged with Alto Paraguay, effectively recreating the