William (Bill) Armstrong's photos with the keyword: rock

A rock projecting above the rushing water of Nistowiak Falls in Saskatchewan. I titled this image rock solid, but of course the water has sculpted this rock and will continue to do so.

This fieldstone left behind by a retreating glacier has been colonized by two kinds of lichens - orange and black - and by some tenacious plants that have established themselves in a crack in the stone.

An outcrop of fractured rocks, with grasses and wildflowers. Captured in Grasslands National Park in June 2006.