I first knew about the geological time scale during my college years, back then the only geological time i knew was “Jurassic” due to a certain Hollywood movie. Learning it was fun but memorizing it for exams was horrible. The lecturers will first show the scale like the one here (very very boring btw), and they will explain one by one what happened with pictures of dinosaurs, plants, ancient humans and etc. It was remarkable, but how did geologists came to this scale always puzzled me, it still does, as we have loopholes in it too. The scale is basically a convention agreed by geologists based on research which were agreeable from time to time.
Here i will briefly explain some key events and how they got there. Most importantly i will put emphasis on how and when life started, the rest is evolution which you can read/view elsewhere. I will be also breaking this topic to a few parts for easy understanding.
After the big bang, the HADEAN period named after Hades begin. The sun was already formed and the rise of giant planets (Jupiter and Saturn) could have happened during this time. This is based on “numerical models“. After the formation of Mars, earth was finally formed in it’s hottest state (hot as hell). It is also postulated that the moon was also formed right after this, and her origins came from earth. Check out the video below on how this could have happened
From here on, our primitive atmosphere begin to arise, which is absolutely hypothetical in case you were wondering. After this particular sequence of events, the building of the habitable earth begins. The first proto ocean were already in play after the cool down effects on earth . There are some speculation that life could have started here; but right after this, the late heavy bombardment (LHB) of comets and meteorite came showering on earth, the planet was destroyed, water evaporated completely and it was a mess. This phenomena is also observable on the moon .If you have wondered why the moon has craters, its because of LHB (despite not having tectonic plates etc).
Now, The ARCHEAN period begins, which is generally the post HLB. Earth during this time has a lot of minerals and more water because of the LHB. In other words, she has received more materials to allow life to flower.
The rest of story is to be continued in the near future, stay tuned
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6 thoughts on “Geological time scale (part 1)”
Hi, thanks for sharing.
Wow, and you folks are so quick to fault Christians for “blind faith”! Twenty planets existed? One collided with Earth to form the moon, a lot of speculation stated as fact.
We don’t fault religions as blind faith. God is just beyond the realm of observable phenomena. Also, please remember…science never purports to PROVE anything nor absolutely. The scientific method DISPROVES hypotheses. And, at least up til today, there has been no physical evidence of God to evaluate.
Very informative! I will stay tuned for more!
I always laughed at time travel fiction (in those versions where the device is happenstance, not directed) where the traveler randomly ends up in some other period populated by humans, or heck, even dinosaurs. It would be much more likely that they would be deposited near trilobites, or on a lifeless water world without plants and thus no oxygen!
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