After browsing several of the fascinating offerings, my love of lichens took me to Botany for Geologists where David at History of Geology does a great job of explaining lichenometry, or the use of lichens to date exposed rock surfaces.
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Geology class at a local outcrop.
David also tipped me off to Riparian Rap, whose series on geomorphically incorrect art is mind-bending entertainment.
As always in the blog world, you can make your way around the planet and back again in a few clicks, and learn a lot about how it's put together in the process.
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