Paraguay is a landlocked country in South America in which three ecoregions met; cerrado (a savannah), Atlantic forest, and chaco (a mix of the two). Areas in which ecoregions meet tend to have very high biodiversity. As an undergraduate I had plans, which sadly fell through, to travel to a research center in Paraguay. As part of the planning process, I did a lot of research on the country, including research related to the geology of the country.
The bedrock in Paraguay is mostly from the Quaternary age and Carboniferous age, though some may be Permian. In more northern parts of the globe, like western New York, you don’t find Quaternary age rocks because the last glaciation period stripped them away. Older rocks are found in the western part of the country. The country is very flat, particularly in the area in which the research center is located. Over about 1.5 miles I walked to class every day as an undergraduate there was a 112-foot change in elevation. Compared to a 48-foot change in elevation over the 0.8 miles it would have taken me to get to my study area.