Late Cretaceous cyclostratigraphy for the subtropical western South Atlantic, Espírito Santo Basin

Well-log data was acquired in a Late Cretaceous section of the Espírito Santo basin (western South Atlantic). Cyclostratigraphic techniques were used to explore the eventual pacing of orbital cycles in the deposition of sequences. The frequency ratio method was used to interpret the orbital cycles and based on this a long-eccentricity signal was interpreted and extracted to create a floating time-scale. Using a seismic horizon associated Cretaceous-Paleogene transition, a strong shift in the natural gamma-ray data was anchored to an age of 66.0 Ma producing an anchored astronomical time-scale placed between late Albian and early Ypresian

Late Cretaceous cyclostratigraphy and astrochronology based on Natural Gamma Ray of the well-log ES-1 drilled at the Espírito Santo basin (western South Atlantic)

NGR is a geophysical acquisition made by Petrobras at the time of well drilling. Petrobras acquired natural gamma-ray (NGR) data for well ES-1 measured between 1880.6 and 5405.7 m

Hydrogen Index determination for the well-log ES-1 drilled at the Espírito Santo basin (western South Atlantic) for the Late Cretaceous

HI derives from Rock-Eval pyrolysis using 100 mg of grounded and powdered rock within a Rock-Eval 6 device

Total organic carbon profile of the well-log ES-1 drilled at the Espírito Santo basin (western South Atlantic) for the Late Cretaceous

Rock samples for TOC were dried at 40 ºC and then grounded to a fine powder with subsequent carbonate dissolution with HCl and organic-carbon combustion using a LECO WR 112 Carbon Analyser