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When you talk about something happening in the precambrian or the cenozoic or the silurian or eocene you are talking about something that happened when a certain kind of fossil life was present. On earth we have a very powerful method of relative age dating fossil assemblages do geologists use radioactive dating to determine the absolute ages of rocks. After writing a lengthy article for sky telescope on the science behind the late heavy bombardment i m agnostic about the question of its existence. In fact paul already knows that coelophysis lived around 200 million years ago while iguanodon lived around 150 million years ago. We can use potassium rubidium and carbon as well. The orientale impact happened shortly after the imbrium impact and that was pretty much it for major basin forming impacts on the moon. Earth is an unusual planet in that it doesn t have very many impact craters they ve mostly been obliterated by active geology.
Relative and absolute ages in the histories of earth and the moon the geologic time scale a few days ago i wrote a post about the basins of the moon a result of a trip down a rabbit hole of book research. Major boundaries in earth s time scale happen when there were major extinction events that wiped certain kinds of fossils out of the fossil record. Paleontologists have examined layered sequences of fossil bearing rocks all over the world and noted where in those sequences certain fossils appear and disappear. Radiometric dating can t give us an exact date. So on the evening news paul told us the dinosaur walked on earth 175 million years ago. Paleontologists have used major appearances and disappearances of different kinds of fossils on earth to divide earth s history at least the part of it for which there are lots of fossils into lots of eras and periods and epochs. Red marks individual impact basins.
This is called the chronostratigraphic time scale that is the division of time the chrono part according to the relative position in the rock record that s stratigraphy . Methods of geological dating numerical and relative dating try refreshing the page or contact customer support. That s why geologic time is usually diagramed in tall columnar diagrams like this.I absolutely hate absolute ages in planetary science because their precision is illusory even for a place like the moon for which we have quite a lot of returned samples. I ll leave those for another day. Long before i understood what any of it meant i d daydream in science class staring at this chart sounding out the names wondering what those black and white bars meant wondering what the colors meant wondering why the divisions were so uneven knowing it represented some kind of deep meaningful systematic organization of scientific knowledge and hoping i d have it all figured out one day.