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Geologic time scale dating

Here's the next step in that journey: the Geologic Time Scales of Earth and the Moon. 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. There are absolute ages and there are relative ages. We use a variety of laboratory ques to fure out absolute ages of rocks, often having to do with the known rates of decay of radioactive elements into detectable daughter products.

Geologic time scale dating

Geologic time scale dating

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. There's no absolute age-dating method that works from orbit, and although scientists are working on age-dating instruments small enough to fly on a lander (I'm looking at you, Barbara Cohen), nothing has launched yet. Relative age dating has given us the names we use for the major and minor geologic time periods we use to split up the history of Earth and all the other planets.

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  • 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.


    Geologic time scale dating

    Geologic time scale dating

    Geologic time scale dating

    Relative-age time periods are what make up the Geologic Time Scale. The Geologic Time Scale is up there with the Periodic Table of Elements as one of those iconic, almost talismanic scientific charts.

    Geologic time scale dating

    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 fured out one day. COOL ONLINE DATING QUESTIONS This all has to do with describing how long ago something happened. There are several ways we fure out relative ages.


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