Friday's #Geology 101, book vs. reality - bedded chert: https://t.co/w4aMOdYB2G (diagram via @GoldenGateNPS http://pic.twitter.com/q248XQcx99
— USGS (@USGS) July 29, 2016
via Twitter https://twitter.com/USGS
July 30, 2016 at 01:17AM
Friday's #Geology 101, book vs. reality - bedded chert: https://t.co/w4aMOdYB2G (diagram via @GoldenGateNPS http://pic.twitter.com/q248XQcx99
— USGS (@USGS) July 29, 2016
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