Palynological and palynofacies analyses of Upper Cretaceous deposits in the Haţeg Basin, southern Carpathians, Romania

Palynostratigraphy, Paleoenvironments and Kerogen Evaluation of the Campanian-Maastrichtian Enugu Shale, Anambra Basin, Nigeria

“…Palynological and palynofacies data retrieved from Enugu outcrops indicate that the samples plot within the fields I and III on the AOM -phytoclasts -palynomorphs (APP) ternary diagram (Fig. 8), representing highly proximal shelf or basin and heterolithic-oxic shelf (proximal shelf) with abundant phytoclasts respectively (Tyson, 1993) Tyson, 1993) The high concentration of terrestrially derived organic matter in the study area suggests proximity to the paleoshoreline (Oboh, 1992;Habib et al, 1994;Carvalho et al, 2013;Lorente et al, 2014;Mahmoud et al, 2013;Zarei, 2017;Tabar & Slimani, 2019). Generally, large amounts of phytoclasts particles, as observed in the present study, are deposited by rivers in estuarine and deltaic environments, both of which are closed to shorelines (e.g., Oboh-Ikuenobe et al, 2003).…”

Integrated palynology and sedimentology of the Mississippian of the Tisdafine Basin (Eastern Anti-Atlas, Morocco)

“…The paleoenvironmental interpretations (proximaldistal trend), revealed by the palynofacies compositions, were obtained according to previous studies published by Tyson (1993, 1995), Mendonça Filho et al (2011, Ţabără and Slimani (2019), Radmacher et al (2020) and Ţabără et al (2021). Therefore, the palaeoenvironmental assessment of the analysed section is derived from the following distribution trends shown by different phytoclast types, namely: (1) the high proportion of equidimensional, Palynology and sedimentology of the Mississippian at Tisdafine rounded and small opaque phytoclasts mainly suggesting a distal marine depositional environment as they result from a lengthy transport; contrastingly lath-shaped, large opaque phytoclasts are indicative of the short transport of these organic particles and support a proximal depositional environment (Radmacher et al, 2020); (2) the high relative frequency of translucent phytoclasts (cuticles, woody tissues), sometimes large in size, in ancient deposits suggests a strong terrestrial influx and proximal/near-shore depositional conditions (Tyson, 1995).…”

“…The particulate organic matter, as phytoclasts, are also used to recognize and interpret changes of the paleoenvironment. In this study, the size and shape of the opaque phytoclasts allowed us to outline a distalproximal trend during the sedimentation of the analyzed deposits, considering the interpretations presented in Tyson (1993Tyson ( , 1995, Tyson & Follows (2000), Mendonça Filho et al (2011), Ţabără & Slimani (2019, Radmacher et al (2020), Ţabără et al (2021). Another aim of our research was to evaluate the thermal maturity of organic matter based on the optical method of spore color (Galasso et al, 2019;Hartkopf-Fröder et al, 2015;Pearson, 1984;Sorci et al, 2020;Spina et al, 2018Spina et al, , 2021Suárez-Ruiz et al, 2012), needed to reconstruct the subsidence stages and assess the degree of burial of the sedimentary series in relation to geodynamic processes that occurred on a large scale in the Tisdafine Basin.…”