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- W2898056082 abstract "A detailed sedimentologic-paleoecologic investigation was carried out in the marine Cretaceous section (Albian to Maestrichtian) of the Potiguar Basin. Underlying Alagoas rocks are lacustrine-deltaic sandstones and shales, and minor limestones that represent regional markers; lacustrine fauna is represented by ostracod coquinas, vertebrate remains, stromatolites, and mollusks. The marine section was divided into six major depositional sequences with chronostratigraphic character: shelf clastic and carbonate sequences are separated by regional transgressive events, while lhe lower boundary of slope sequences is erosional. The sequences and corresponding depositícnal systems are: VI onlap slope clastics (Ubarana Formation), Maestrichtian-Campanian; V shelf to slope carbonates (Jandaíra Formation), Campanian-Turonian; IV fluvio-deltaic elastics (Açu Formation late Cenomanian; III onlap slope clastics (Ubarana Formation), middle-early Cenomanian; II shelf clastics and carbonates (Açu-Ponta do Mel formations), late Albian; I fluvio-deltaic elastics (Açu Formation), middle-early Albian. The onlapping slope deposits of unit III are located in Ubarana reentrance or canyon, an erosional feature originated at the Albian/Cenomanian boundary and that survived up to lhe Tertiary, when it became the depositional site of thick submarine basalt flows of the Macau Formation (early Miocene-Oligocene). Mapping of these sequences and their systems allows a better understanding of the structural and stratigraphic evolution of the basin." @default.
- W2898056082 created "2018-10-26" @default.
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- W2898056082 date "1988-06-01" @default.
- W2898056082 modified "2023-09-26" @default.
- W2898056082 title "Stratigraphic analysis of the marine cretaceous in the eastern margin of Portiguar Basin" @default.
- W2898056082 doi "https://doi.org/10.25249/0375-7536.1988182231236" @default.
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