The granite bedrock surrounding Belle Isle contains many variations of a fascinating geologic feature: the pothole or rock pool. These round and oval holes are caused by the grinding action of gravel or stones that lodge in the cracks of rocks during floods. As the pebble is vibrated by the current, it grinds down the stone around it, eventually creating a hole that can be a microcosm for ecological processes.
Note the different locations and shapes of the rock pools, and investigate the plant and animal life that inhabits them. Each one is a world of its own!
Rock pools – also called potholes – are holes in the granite riverbed caused by the grinding action of gravel and stones during floods, or by the actions of man. Plants that thrive in and around them are uniquely adapted for their unusual, and often changeable and challenging, setting. Explore these fascinating specimens.