Rocks with similar ages, mineral compositions, and geologic structures are found on the coast of South America and the western coast of Africa. This suggests that the two continents were once part of the same landmass and have since separated.

- Rock Types: The rocks on both continents, particularly along their coastlines, demonstrate striking similarities. These rocks include metamorphic rocks such as gneiss and amphibolite, along with granite and volcanic rocks. The lithologies and compositions of these rocks match, indicating a shared geological history.

- Geological Structures: The geological structures found on one continent are mirrored on the other. Notable features include mountain belts and fold systems that extend across the Atlantic Ocean and match up when the continents are fitted together. For example, the Serra do Espinhaço mountain range in eastern Brazil corresponds to the West African Craton.

- Paleontological Evidence: Fossil records from South America and Africa further support the theory of continental drift. Certain plant and animal species, including fossil records of now-extinct organisms like the mesosaurs and the cynodonts, are discovered in regions of South America and Africa that fit together when the continents are reconnected.

- Continental Fit: When considering the shape and outline of the continents, especially their coastlines, we see a remarkable fit when they are positioned side by side. Africa's bulge around the Gulf of Guinea perfectly matches the indented shape of South America's northeastern coastline.

These observations, along with other lines of evidence, provided strong support for the continental drift theory proposed by Alfred Wegener. The correlation of rocks, mountains, and other geological features between South America and Africa serves as one of the key pieces of evidence indicating that these continents were once part of a larger supercontinent called Gondwanaland and have subsequently drifted apart.