nonwelded tuff

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Slave craton — which is one of the oldest dated rock units on Earth at 4.03 Ga. The crust of the Slave craton is thought to have amalgamated during a 2.69 Ga collision between a proto Slave western basement complex, known as the Central Slave Basement Complex,… … Wikipedia
Back River volcanic complex — The Back River volcanic complex is an Archean stratovolcano, located km to mi|num=480|abbr=no|spell=Commonwealth|precision=0|wiki=yes northwest of Yellowknife, Northwest Territories, Canada. The volcano constitutes the Back Group of the… … Wikipedia

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