2 Replies to “On the rocks at Caswell Bay 9”

  1. I think you just solved a mystery for me. I can no longer find a particular mark on a granite glacier erratic that I visit frequently. I couldn’t figure out what happened to it. But now I think it may have been been black lichen, and it may have been scoured out over the winter, or maybe just heavy rain or high water in the river beside it. Thanks!

    Liked by 1 person

  2. I am pleased you were able to solve the mystery, Linda. Lichens get everywhere and alter colour, texture, and often enhance the appearance of many rocks. Ultimately they can be destructive because some of them not only settle on the surface but actually penetrate the substrate.

    Liked by 1 person

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