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#geology
#grand canyon
#grand canyon stratigraphy
#science
#supai group
#shale
#sea level
#erosion
#pennsylvanian
#sediment
#sedimentary
#formation
#esplanade platform
#sandstone
#the earth story
#geology
#grand canyon
#grand canyon stratigraphy
#science
#supai group
#shale
#sea level
#erosion
#pennsylvanian
#sediment
#sedimentary
#formation
#esplanade platform
#sandstone
#the earth story
Prev
Random
Next