Block waterfalls are really just a variation on Step Waterfalls. The main difference is that the rock layers are "blocky" and create larger, more geometric steps.
The lack of a resistant caprock prevents the formation of a vertical falls. This is because there is no caprock to be undercut by erosion of soft rocks underneath. These waterfalls form where the rock beds are thick.
These waterfalls are quite rare in Ontario. I might drop this type, although it does appear elsewhere. It's perfectly fine to call them Step Waterfalls too.
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