Geological and climatic drivers contributed to sea-level regression and fluctuations during the Maastrichtian Epoch, as supported by stratigraphic and paleoenvironmental studies.
Papers [1] and [6] specifically discuss sea-level changes (regression and eustatic curves) during the Maastrichtian Epoch driven by climatic, tectonic, or environmental factors. Other papers either discuss different geological periods or are irrelevant (e.g., parrot cognition).