Geologic Time

  • The Age of the Earth (The Search Begins)

    FAS Astronomers Blog, Volume 33, Number 4. The Earth was formed … some time ago … but when? To answer this question, I decided to focus on three things. This is part 1 of the quest, describing how geologist unraveled the history of the Earth.  Early attempts Early attempts to determine the Earth’s age were…

  • A History of the Earth (Geologic Time)

    FAS Astronomers Blog, Volume 31, Number 10. The history of the Earth is described by geologists using something call Geologic Time. This is a timeline from the beginning of the Earth to the present day broken down into a hierarchy of four main groupings: Eons, Eras, Periods, and Epochs. Epochs are broken down further into…