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EARLY PALEOGENE OVERBANK DEPOSITIONAL PATTERNS IN THE HANNA BASIN AND COMPARISON WITH COEVAL STRATA IN THE BIGHORN BASIN (WYOMING, U.S.A.)

During the Laramide Orogeny a series of intermontane basins developed in the Rocky Mountain region, the strata of which record the local uplift and paleoclimate history (Dickinson et al., 1988; Aziz et al., 2008; Abels et al., 2013, 2016). This study focuses on two of these basins; the well studied Bighorn Basin in northwestern Wyoming and the relatively understudied Hanna Basin of south-central Wyoming. Both contain distinctive patterns of early Paleogene alluvial deposition including fluvial sandbodies and a variety of floodplain lithofacies (Aziz et al., 2008; Abels et al., 2013, 2016; Kraus and Gwinn, 1997; Wroblewski 2002; Dechesne et al., in review). The well-studied Willwood Formation of the Bighorn Basin contains weakly developed red-bed paleosols stacked between sandy fluvial avulsion deposits (Abels et al., 2013; Fig. 1). Similarly, the Hanna Formation of the Hanna Basin is notable for its repetitive patterns of sandrich units interbedded with finer organic-rich shales, siltstones, and carbonaceous strata (Dechesne et al., in review; Fig. 1). This project will analyze depositional cycles in the Hanna Formation, and compare these to those of the Bighorn Basin in order to reveal any common depositional patterns and hypothesize on their potential controls. While separating allogenic and autogenic controls of cyclical sedimentation patterns in fluvial settings is a difficult task (Abels et al., 2013), comparing patterns in these two basins could illuminate whether there were local, regional, or even global climatic controls on basin deposition during this time. BACKGROUND