Fig. 1: Geological maps with locations of the Campos Basin and Fragata drill core.
From: Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean
The location of the Fragata drill core within the geological map of the Campos Basin (B) in the Brazilian conjugate margin (A). The geological map illustrates the present-day coastline as well as depth contours in meters for the top of the Macabu Formation (B). Northwest to southeast with change in dip direction to north-northeast seismic section (blue lines in B) in depth illustrating the geologic context of the Fragata core (6-DEV-018-RJS) in the Campos Basin (C). Blue arrows indicate the base of the Macabu Formation; The orange arrow and dotted line show the base of the Retiro Fm. The Fragata core is located at the edge of the external high with seismic reflector terminations (white arrows) indicating erosion along an escarpment setting. Outboard parallel, continuous reflectors are observed indicating a ponded and deeper lake system. Two wells (Well 1 and 2) located in the East Graben in the outboard comprise pre-salt ostracod biostratigraphic data and calibrate the stratigraphy to the Jiquiá and Alagoas zones or Coqueiros and Macabu Formations, respectively. Sources of the basemap (A): Esri, HERE, Garmin, FAO, NOAA, USGS.
