The Late Cretaceous bivalveDidymotis Gerhardt, 1897 from Sergipe, Brazil

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Coniacian Stage (Salzgitter-Salder, Germany) and its auxiliary sections (Słupia Nadbrzeżna, central Poland; Střeleč, Czech Republic; and El Rosario, NE Mexico)

“…It is additionally characterized by finer, sharper, and more closely spaced commarginal rugae crossed by radial elements. We consider that this morphotype is best referred to D. costatus (see also discussion in Wiese, 1997;Seeling and Bengtson, 2003). Contrary to earlier statements (e.g., Wood et al, 1984;Kauffman et al, 1996), this event does not fall in limestone Bed 45b, which contains fewer fossils and may mark a reduced sedimentation rate.…”

“…Although poorly understood at the species level and in its evolutionary context (see e.g., Andrade, 2005), the genus Didymotis is a very useful marker of the Turonian-Coniacian boundary interval within the Euramerican Biogeographic Region. The genus is regularly present from the middle M. scupini Zone of the upper Turonian, up to the C. deformis erectus Zone of the basal lower Coniacian (e.g., Wood et al, 1984;Walaszczyk, 1992;Wiese and Kröger, 1998;Walaszczyk, 2000;Seeling and Bengtson, 2003;Čech and Uličný, 2021), with a series of distinct successive morphotypes (Wood et al, 1984;Wiese, 1997;Čech and Uličný, 2021). The stratigraphically youngest record comes from the C. deformis deformis / C. crassus crassus inoceramid Zone of the Březno section in Bohemia (see, Čech and Švábenická, 1992).…”

The first occurrence of a lingulid brachiopod from the Cretaceous of Sergipe, Brazil, with a restudy of ‘Lingula’ bagualensis Wilckens, 1905 from southern Patagonia

“…1 Simplified geological map of onshore area of the Sergipe Basin (non-marine Cenozoic removed), with the upper Turonian lingulid locality Oiteiro 5 marked. Adapted from Bengtson (1983) and Seeling and Bengtson (2003) Fig. 2 Lithostratigraphy of the Sergipe Basin and tectonic evolution of the South Atlantic basins (from Walter et al 2005) from the Campanian of the Pernambuco-Paraíba Basin (Oliveira 1957).…”

First record of the mosasaur Platecarpus Cope, 1869 from South America and its systematic implications

“…The material described herein derives from the Cotinguiba Formation, which was deposited during the Cenomanian-Coniacian interval in neritic to upper bathyal environments under moderately dysoxic to fully anoxic bottom conditions and well-oxygenated epipelagic conditions (Bengtson, 1983;Berthou & Bengtson, 1988;Koutsoukos et al, 1991). The formation is dated primarily with ammonites, inoceramid bivalves and foraminifers (Bengtson, 1983;Kauffman & Bengtson, 1985;Koutsoukos & Bengtson, 1993;Seeling & Bengtson 2003a;Andrade et al, 2003, and unpublished results). The age of the two mosasaur teeth described here is established as late Turonian and Turonian-Coniacian, respectively, on the basis of ammonites and inoceramids.…”

“…The marine Cretaceous rocks exposed in the Sergipe Basin in northeastern Brazil (Figure 1) contain a rich macroinvertebrate fauna dominated by ammonites (Bengtson, 1996(Bengtson, , 1999, and references therein), bivalves (e.g., Bengtson, 1983;Hessel, 1988;Seeling & Bengtson, 1999;2003a, 2003bAndrade et al, 2003Andrade et al, , 2004, gastropods (Burrer et al, 2002) and echinoids (e.g., Smith & Bengtson, 1991;Manso & Souza-Lima, 2003). Vertebrate remains are locally common and mainly represented by scales, teeth, and vertebrae of bony fishes, whereas reptilian remains are rare (Bengtson, 1983).…”