Seen near Phantom Creek, North Kaibab trail, Grand canyon National Park
" ... around 1.7 billion years ago, blobs of magma rose from the subduction zone and intruded the Granite Gorge Metamorphic Suite. These plutons slowly cooled to form the Zoroaster Granite; part of which would later be metamorphosed into gneiss. This rock unit can be seen as light-colored bands in the darker garnet-studded Vishnu Schist."
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== {{int:filedesc}} == {{Information |Description=Seen near Phantom Creek, North Kaibab trail, Grand canyon National Park " ... around 1.7 billion years ago, blobs of magma rose from the subduction zone and intruded the Granite Gorge Metamorphic Suite...