Age dating crater counting

When you talk about the Precambrian, Paleozoic, Mesozoic, and Cenozoic on Earth, or the Noachian, Hesperian, and Amazonian for Mars, these are all relative ages.Relative-age time periods are what make up the Geologic Time Scale.Its underlying assumption, unquestioned for decades, has recently been found to be seriously flawed.Crater-count dating seems perfectly logical: the more craters, the older the landscape.Below you will find a text describing the basic principles behind the Planetary Science Institute system of utilizing crater counts and isochron diagrams in order to estimate crater retention ages of surfaces on Mars.As discussed by Hartmann (1966) the crater numbers can date the actual formation age of a surface in an ideal case, such as a broad lava flow which forms a one-time eruptive event.Unfortunately, those methods don't work on all rocks, and they don't work at all if you don't have rocks in the laboratory to age-date. They are descriptions of how one rock or event is older or younger than another.

The answer is one of the basic tools of comparative planetology: Impact craters.Filed under: craters,creationism,dating methods — Stuart Robbins @ pm Tags: crater age dating, crater counting, creationism, David Coppedge, icr, institute for creation research, secondary crater age problem, secondary craters How can astronomers say that Mars had recent volcanism?Or that the surface of the moon Io is younger than 50 years?The impact occurs at high speed, and the final crater depth, diameter, and shape are effectively determined by the surface gravity, the mass of the impactor, and the velocity of the impactor.Almost all impact craters are circles; only impacts at very low angles (less than 10°) will form elliptical craters.In the science of geology, there are two main ways we use to describe how old a thing is or how long ago an event took place. When you say that I am 38 years old or that the dinosaurs died out 65 million years ago, or that the solar system formed 4.6 billion years ago, those are absolute ages.

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