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#geology
#open pit mine
#surface mine
#gondwana
#barakar formation
#sediment
#sedimentary
#the earth story
#geology
#open pit mine
#surface mine
#gondwana
#barakar formation
#sediment
#sedimentary
#the earth story
#science
#geology
#wisconsin
#mining
#surface mine
#beach
#fracking
#frac sand
#cambrian
#ordovician
#the earth story
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