• "The “Moscow Landing” site has been widely studied (e.g., Smith, 1997; Mancini and Puckett, 2005; Wawak, 2007; Hartet al., 2013). It preserves an extensive exposure of the K/Pg boundary with a unique record of the impact-generated tsunami event. The western bank of the Tombigbee River exposes a mixed carbonate-siliciclastic sequence of the Maastrichtian Prairie Bluff Chalk unconformably overlain by the Paleocene Clayton Formation.The Prairie Bluff Chalk is a 3.1 m thick white to light-gray, massive, extensively bioturbated, micaceous chalky to silty marlstone. Aphosphatic macrofossil bed (PMB) (after Smith, 1997) occurs approximately ~1 m (or ~2 m in places) below the top of the Prairie Bluff Chalk. It has been interpreted as a surface of maximum transgression (maximum flooding surface) based on biostratigraphy, taphonomy and sequence stratigraphy (Mancini et al., 1996; Smith,1997; Puckett, 2005; Naujokaityte et al., 2014). The PMB is a~25 cm thick, semi-clast-supported bed with abundant phosphatic nodules, and reworked, abraded, and predominantly phosphatized internal molds of a diverse molluscan assemblage.A second shell bed(“lower shell bed”) is present 50 cm below the PMB. In contrast to the PMB, the lower shell bed is a 10 cm thick matrix-supported bed with a less diverse fauna (predominantly Exogyra sp., and Pycnodonte sp.) and lacks phosphatic nodules. The formational contact varies from heavily bioturbated to sharp (near the clastic unit). In this area, the Clayton Formation consists of two-dominant facies: 1. Light gray sandy marl with P. pulaskensis (bioturbated contact). 2. Channel fill quartz-rich sand (clastic unit) with Prairie Bluff Chalk rip-ups and impact spherules (sharp contact) (Hart et al., 2013)." (Larina et al. 2016)