A zircon separated from a sandstone is dated
at 1.8 Ga; however, the depositional age of the
sandstone is 0.8 Ga, this means that
1. deposition of sandstone started at
1.8 Ga and ended by 0.8 Ga ago
2. zircon is detrital and derived from a
1.8 Ga rock
3. zircon has been in transit for more
than 1 Ga
4. sandstone is deposited over a 1.2 Ga
basement
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