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#grand canyon
#rama schist
#geology
#protolith
#metamorphic
#tuff schist
#science
#the earth story
#stratigraphy
#precambrian
#grand canyon
#rama schist
#geology
#protolith
#metamorphic
#tuff schist
#science
#the earth story
#stratigraphy
#precambrian
Prev
Random
Next