“…The combination of restricted marine currents, low oxygenation of bottom waters, and fertilization by volcanic activity in rifted, arc-related, and foredeep basins resulted in common deposition of organic-rich, gray-to-black sediments (calcareous shales and argillaceous-to-silty carbonates). Variation in deposition depths, clay content, and oxygenation determined differences among Tithonian source rocks, but these Tithonian sediments gave rise to the main Jurassic hydrocarbon source rocks in Mexico, the GoM, and Cuba (Viniegra, 1981; Peterson, 1983; Santamaría-Orozco et al, 1995; Rodríguez-Viera et al, 1998; Ángeles-Aquino and Cantú-Chapa, 2001; Cole et al, 2001; Eguiluz de Antuñano, 2001; Guzmán-Vega et al, 2001; Magoon et al, 2001; Mancini et al, 2001; Prost and Aranda, 2001; Williams-Rojas and Hurley, 2001; Gaumet and Letouzey, 2002; Cantú-Chapa and Ortuño-Maldonado, 2003; Moretti, et al, 2003; Santamaría-Orozco and Horsfield, 2003; Padilla y Sánchez, 2007; Schenk, 2010; Muñoz-Cisneros et al, 2013). Paleogeographic interpretations of western areas related to active plate margins facing the Panthalassa Ocean are still unconclusive and controversial.…”