The (Aptian) McMurray Formation, the main reservoir in the Athabasca Oil Sands Region (AOSR), is dominantly comprised of heterolithic point-bar deposits contained within regionally-extensive meander belts. The influence of meander-belt geometry and point-bar stratigraphic architecture on lithofacies distribution in McMurray Formation point-bar deposits is poorly understood, despite the potentially adverse effects lithological heterogeneities have on reservoir fluid volume and movement. This goals of this project are: (1) investigate the geometry of composite channel-form bodies (CCFBs) (e.g., meander belts) in the McMurray Formation and determine if their external and/or internal characteristics link to reservoir distribution or quality; (2) establish a relationship between accretion-package geometry, migration style, and lithofacies distribution in McMurray Formation point-bar deposits; and (3) characterize and quantify point-bar sedimentation and erosion that occurs in meandering rivers during high-magnitude floods, events during which point-bar growth or retreat typically occur. Detailed geological mapping reveals that (1) average McMurray Formation CCFB thickness varies regionally and temporally, but average reservoir parameters are generally consistent between all CCFBs; (2) point-bar deposits located in McMurray Formation CCFBs have distinct intra-point-bar lithological heterogeneities that typically occur across discontinuity surfaces bounding point-bar accretion packages, particularly if the discontinuity is associated with a change in meander migration mode. Thus, seismic time-slice images can be used to predict the position of planform lithological heterogeneities in McMurray point-bar deposits, enabling prediction of reservoir compartmentalization; and (3) although extreme floods in meandering rivers are often catalysts for pronounced geomorphological change, an extreme-flood deposit on a point bar in a sand and gravel-bed meandering river is not typified by a single grain size or sedimentary structure; instead, it consists of beds with a coarser texture (particularly gravel, if available) than what is average for that location on the point bar. In addition to enhancing our knowledge of point-bar formative processes, these insights will refine the production-forecasting process for bitumen-producing reservoirs, improve prediction of regional sandstone trends in the McMurray Formation, and provide a foundation for investigations of upstream-downstream sedimentological, ichnological, and morphological trends that could shed light on the formative sedimentary processes that shaped deposits of the McMurray Formation.