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. It is the. Lots of books out there. The oldest type of rock is acasta gneiss which first formed 4 2 billion years ago. The rock body is exposed on an island about 300 kilometres north of yellowknife.
At 3 96 billion years old this gneiss is one of the oldest known earth rocks. The acasta gneiss is a tonalite gneiss in the slave craton in northwest territories canada. 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. Rock that is approximately 4 billion years 4000 ma that is million years old is known over an area of about 40 km 2 about 150 km south of the arctic circle bowring and williams 1999. First described in 1989 it was named for the nearby acasta river east of great bear lake.
Is found in a small area of the slave craton a western province of the precambrian shield of canada. Finding that gemstone is a great way for you to do rock identification your self understanding all the information out there about different rocks stone you never stop learning. Acasta gneiss oldest known rock on earth. The earth is 500 million years older still but little record of that early time has survived our planet s geologic activity. The rock body is exposed on an island about 300 kilometres north of yellowknife.
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The acasta outcrop is found in a remote area of the tłı chǫ people land settlement. Acasta gneiss world s oldest crustal rock slice gem jar nice slice 4 billion yrs. The oldest type of rock is acasta gneiss which first formed 4 2 billion years ago. The acasta outcrop is found in a remote area of the tłı chǫ people land settlement. Is found in a small area of the slave craton a western province of the precambrian shield of canada.The oldest type of rock is acasta gneiss which first formed 4 2 billion years ago. At 3 96 billion years old this gneiss is one of the oldest known earth rocks. 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.
