Upper Tertiary to Quaternary deposits from northeastern Para State, Brazil, were imaged with ground penetrating radar (GPR) and calibrated with geological data from a local cliff. The procedure allowed for the recognition of five radar facies (i.e., discontinuous parallel, continuous parallel, chaotic and reflection-free, oblique, and mound facies) that are organized into four radar units (referred to here as Units 1 to 4). Unit 1 includes mostly continuous parallel reflections and secondarily, discontinuous parallel and mound reflections, being correlatable at the cliff face to low-energy muddy lagoon and mud flat depositional settings. Unit 2 consists of continuous even parallel, discontinuous parallel, oblique, as well as chaotic and reflection-free facies, being related to low-energy muddy deposits interlayered with sands, which are attributed to tidal flats and channels. Units 3 and 4 include chaotic, reflection-free and, locally, discontinuous parallel radar facies, correlatable at the cliff face to massive sands, mostly representing aeolian coastal dunes. These units are bounded by continuous, high amplitude reflections that can be easily correlatable throughout the GPR profiles, serving as important stratigraphic markers. The GPR survey improved the reconstruction of the depositional environments through the recognition of tidal channel and point bar deposits within Unit 2, not present at the cliff face. The stratigraphic framework was also improved through the recognition of the discontinuity surface between Units 3 and 4, also not defined in previous studies, but which revealed to be a regionally significant stratigraphic marker attributed to a relative sea level fall.