re: Wopmay
OK,
so we've got dessication cracks, perhaps some mounded features embedded in the planar layering, some convoluted bedding which may or may not be cross-bedding, and lots of sulphate.
Sounds like an ephemeral shallow water pool with hydrothermal overtones, rather than the shore of an ocean.
I still prefer a model driven by groundwater seepage to a wet evaporating surface, rather than water sloshing around everywhere on this unbounded slope down into the northern plains.