Petrobras, 1983. "Sao Luiz Basin, Brazil", Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces, A. W. Bally
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This seismic section shows structural features associated to gravity faults that occur in the Sao Luiz Basin, northern Brazil.
In this area, structures are quite pronounced and are related to two principal tectonic events:
1. The Arco Ferrer uplift in the northern part of the Parnaiba Paleozoic basin, during Triassic-Jurassic time. This uplift was followed by intense erosion. Paleozoic sediments, representing extensions of the stratigraphic units of the Parnaiba basin, were preserved in down-faulted blocks.
2. The pronounced tilting of the basin toward the north, beginning in Early Cretaceous and accentuated during Late Cretaceous time. This last phase is characterized by extension that gave rise to gravity faulting. Horsts and grabens with associated domal structures were formed.