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This method is thought to represent the time when lead isotopes were last homogeneously distributed throughout the Solar System and, thus, the time that the planetary bodies were segregated into discrete chemical systems.The results from these methods indicate that the Earth, meteorites, the Moon, and, by inference, the entire Solar System are 4.5 to 4.6 billion years old.Three basic approaches are used to determine the age of the Earth.The first is to search for and date the oldest rocks exposed on the surface of the Earth.

In Precambrian rocks, however, fossils are rare; thus, the geologic record of this important part of the Earth’s history has been especially difficult to decipher.Present evidence indicates, however, that these intervals were rather short (100-200 million years) in comparison with the length of time that has elapsed since the Solar System formed some 4 to 5 billion years ago.Thus, the ages of the Earth, the Moon, and meteorites as measured by different methods represent slightly different events, although the differences in these ages are generally slight, and so, for the purposes of this chapter they are here treated as a single event.The best evidence is contained in the Earth’s incomplete and complex but accurate stratigraphic record — a record that has been the subject of nearly two centuries of study.Slowly and painstakingly, geologists have assembled this record into the generalized geologic time scale shown in Figure 1.




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There were a few conflicting rumors as some thought that they were merely taking a break while others thought that he had already moved on to Katy Perry, his old flame. They have not seen each other in probably two months.” FKA twigs, who has kept her personal life off her Instagram, has been posting snippets from her newly single life. “She’s been dating Victoria’s Secret model Stella Maxwell for coming up to a year,” reports the .


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