People have been studying geology in some form for a very long time. But 2015 marks the 200th year of what is now a standard of geologic practice: the geology map. I got a close look at the first geology map back in 2012 and thought the bicentennial of William Smith's breakthrough accomplishment is worth another look. http://washingtonlandscape.blogspot.com/2012/10/the-first-geology-map-surpise-at-tate.html
The Monthly Fern??—Prairie Spikemoss
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*Selaginella densa*—moss, fern, fern ally, or none of the above? Coin is 19
mm across.This month the South Dakota fern series features another oddity—a
s...
4 days ago
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