As to implications of [the Waccamaw Formation deposits that I have worked on], the main points are that
1: the material is extremely unsorted, containing shells over 150 mm long, shells under 5 mm long, and clay that takes multiple days to settle out of the water I washed things in. This indicates very low water speeds [mostly, there is one river-deposited bed at the top that has more coarse material].
2: Many of the shells are fragile: we have found multiple complete specimens of Gari , Solecurtus , and one Mactrotoma , all of which are large clams that would break if I squeezed them a bit too hard, or dropped them.
3: In the stratigraphy, note the extinction rates always increasing with depth (discrediting different habitats from the same time being deposited on top of each other), the presence of dinosaurs near the bottom (discrediting escape ability or depth as a viable deposition scheme) and oysters throughout, the chaotic variation in sediment type (discrediting a consistent change in grain size), the chaotic up and down in depth and multi-decade lifespans of organisms in each layer (discrediting any rapid deposition).