In morphological terms, Uruguay consists of the coastal plain to the south and southeast, the Cuchilla Grande (299 m) and Cuchilla de Haedo (294 m) inland, the alluvial valley of the Rio Negro River and the plains to the west, which descend into the Uruguay River Plain.
Explanation:
- Uruguay's geological base consists mainly of metamorphic rocks, intrusions, and Precambrian strata, which are covered by Paleozoic and Mesozoic deposits.
- In the central part of Uruguay, these old deposits are covered by horizontal Permian layers, and in the northern part, in the Parana River basin, by Triassic sand stones.
- Metamorphic rocks and granites occur on the surface only in the eastern and southern parts.
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