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pubs.er.usgs.gov/publication/70136641
I took this amazing "Geologic map of the United States (exclusive of Alaska and Hawaii)" by Philip Burke King, Helen M. Beikman, and Gertrude J. Edmonston, published 1974, showing the age of rocks (Cenozoic, Mesozoic, Pre-Cambrian!) in the US, found its projection coordinates, and reprojected it to equirectangular so anyone can clip out interesting tidbits from it.
https://github.com/fasiha/steppe-map for the cartographic goodness.
It blows my mind that when we drive from Dayton to Columbus (in Ohio, USA), we drive from bedrock from
- Upper Ordovician, 461 to 444 million years ago, to
- Middle and Upper Silurian, roughly 428 to 416 mya, to
- Middle and Upper Devonian epochs, roughly 397 to 359 mya. FYI, Devonian is when land animals appeared!
We see this Paleozoic rock at places like Clifton Gorge and John Bryan State Park, where half-an-eon-old bedrock is exposed by ten thousand year old river.
#Geology FTW. 🤯