Trough waterfalls occur where layered rocks are tilted or inclined. Erosion creates a V-shaped long profile, where the top of one layer meets the side of another. This creates a trough-like structure that guides water downstream.
These falls aren't usually very tall, but they can be long and interesting to explore. They do not occur in southern Ontario because the bedrock there is flat-lying.
Sometimes the orientation of the rock beds is not aligned with the general direction of the stream or river. Troughs can thus sometimes temporarily interupt the direction of stream flow.
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