|
The Acasta Gneiss is a tonalite gneiss in the Slave craton in Northwest Territories, Canada. The rock body is exposed on an island about 300 kilometres north of Yellowknife. The rock of the outcrop was metamorphosed 3.58 to 4.031 billion years ago and is the oldest known intact crustal fragment on Earth.
Wikiplacemarks.com
Android Apps
Placemarks
Login
Faq
Language
좋은 아이디어 있으시면 저희에게 알려주십시오.