With stromatolite but no desiccation crack, the depositional environment of Middle-Late Cambrian in the area was intertidal zone to subtidal zone with the shallow-water features.
People would arrange the intertidal zone, kind of managing the hydrology to create areas where clams would just grow in sort of hyperabundance that they could then come and harvest.
The last category of coastal wetlands that experience seawater or tidal influences are the Intertidal flats – these are flat areas subjected to tides that are too unstable in terms of sediments and so remain unvegetated.