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Radiometric dating of the oldest rocks found on earth

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Planet Earth doesn't have a birth certificate to record its formation, which means scientists spent hundreds of years struggling to determine the age of the planet. So, just how old is Earth? By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4. Related: How Big is Earth? Scientists have made several attempts to date the planet over the past years. They've attempted to predict the age based on changing sea levels, the time it took for Earth or the sun to cool to present temperatures, and the salinity of the ocean.
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The Acasta gneiss: Earth's oldest surface rock

Radiometric dating of the oldest rocks found on earth
Radiometric dating of the oldest rocks found on earth
Radiometric dating of the oldest rocks found on earth
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Geologic Time - Geology (U.S. National Park Service)

The oldest dated rocks formed on Earth , as an aggregate of minerals that have not been subsequently broken down by erosion or melted, are more than 4 billion years old, formed during the Hadean Eon of Earth's geological history. Meteorites that were formed in other solar systems can pre-date the Earth. Particles from the Murchison meteorite were dated in January to be 7 billion years old. Hadean rocks are exposed on the Earth's surface in very few places, such as in the geologic shields of Canada , Australia , and Africa. The ages of these felsic rocks are generally between 2. The approximate ages have a margin of error of millions of years. In , the oldest known rock on Earth was dated to 4.
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7 Oldest Rocks Ever Discovered

Slowly and painstakingly, geologists have assembled this record into the generalized geologic time scale shown in Figure 1. This was done by observing the relative age sequence of rock units in a given area and determining, from stratigraphic relations, which rock units are younger, which are older, and what assemblages of fossils are contained in each unit. Using fossils to correlate from area to area, geologists have been able to work out a relative worldwide order of rock formations and to divide the rock record and geologic time into the eras, periods, and epochs shown in Figure 1. The last modification to the geologic time scale of Figure 1 was in the s, before radiometric dating was fully developed, when the Oligocene Epoch was inserted between the Eocene and the Miocene. Although early stratigraphers could determine the relative order of rock units and fossils, they could only estimate the lengths of time involved by observing the rates of present geologic processes and comparing the rocks produced by those processes with those preserved in the stratigraphic record.
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Explore This Park. The eroded cliffs reveal 1. The oldest rocks exposed in the canyon are ancient, 1, million years old. Conversely, the canyon itself is geologically young, having been carved in the last 6 million years.
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