Describe how the geologic column is used in relative dating
The volcanism pretty much ended halfway through the Moon's history. Ice core sampling normally uses the assumption that the ring bands observed represents years.
And it's impossible to know where a lunar meteorite originated. Presumably older impact craters made pretty rays too, but those rays have faded with time. When you find the same fossils in rocks far away, you know that the sediments those rocks must have been laid down at the same time. Most recently, a few late impact craters, including Copernicus, spread bright rays across the lunar nearside. Any surface that has Imbrium ejecta lying on top of it is older than Imbrium.
Relative Dating and Absolute Dating by Adam Carmichael on Prezi
There is an enormous body of science on the age-dating of Apollo samples and Moon-derived asteroids. Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers. So we can get incredibly precise dates on the ages of these rocks, but can't really know for sure what we're dating. Polystrate tree fossils that extend through multiple layers are common.
Of course, this only works for rocks that contain abundant fossils. The other way we use craters to age-date surfaces is simply to count the craters.
Red marks individual impact basins. However, when scientists apply relative dating to a preconceived uniformitarianism model, the dating methods are only as good as the model. The brown splotch denotes ebbing and flowing of mare volcanism. There are some uncertainties in the positions of the boundaries of the units.
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