LOUISIANA STATE UNIV BATON ROUGE COASTAL STUDIES INST
This paper, the second in a series describing the geology and geomorphology of the coastal plain of Rio Grande do Sul, Brazil and northern Uruguay, is primarily concerned with the geographic distribution of stratigraphic units within the area. To accomplish this objective, the entire coastal plain - an area of 47,100 square kilometers or 18,200 square miles - has been mapped using the scale 1500,000. In general, this area is a low, sandy plain whose western margin is formed by higher land which is composed of rocks ranging in age from pre-Cambrian to Jurassic. The surface sediments within the coastal plain are described and mapped for the first time. They are Quaternary in age. Regional mapping of the entire area has led to a somewhat different interpretation of the geologic history than was advanced in an earlier report by the writer. The most significant change involves modification of the concept of Recent faulting in the coastal plain. Author
Rept. on South American Coastal Studies. Prepared in cooperation with Universidade do Rio Grande do Sul, Porto Alegre (Brazil). See also AD-400 747.