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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The oldest dated rocks on Earth, as an aggregate of minerals that have not been subsequently melted or disaggregated by erosion, are from the Archean Eon. Such rocks are exposed on the surface in very few places. There is some controversy about the oldest rocks based on the oldest dated mineral zircon. Some of the oldest surface rock can be found in the Canadian Shield, Australia, Africa and in other more specific places around the world. The ages of these felsic rocks are generally between 2.5 and 3.8 billion years. The approximate ages have a margin of error of millions of years. In 1999, the oldest known rock on Earth was dated to 4.031 A 0.003 billion years, and is part of the Acasta Gneiss of the Slave craton in northwestern Canada. Since 2008, the oldest rock on earth has been discovered by McGill University in the Nuvvuagittuq Belt on the coast of Hudson Bay, in northern Quebec, and is dated from 3.8 to 4.28 billion years old.

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