Geologic History

10 flashcards · Biology · by acherates

1. Supereon, Eon, Era, Period, Epoch, Age

   Seepea!

2. The Precambrian Super Eon

   The Precambrian Super Eon Super Eon containing the Hadean, Archean and Proterozoic eons. Some 4 billion years. Nearly 90% of Earth's history.

3. Hadean Eon

   Hadean Eon 4.6b years ago. The Rockless eon. Earth & Moon form, earth crust solidifies, heavy bombardment with asteroids. 600m years Midnight to 2am

4. Archean Eon

   Archean Eon 4b to 2.5b years ago Abiogenesis, unicellular organisms, bacteria, free oxygen, Ur supercontinent. 1.5b years 2am to 5:30am

5. Proterozoic Eon

   Proterozoic Eon 2.5b to 541b years ago. Multicellular life, invertebrates, sponges, oxygenated atmosphere, Huronian glaciation, Rodinia and Pannotia continents. 2b years 5:30am to 10am

6. Phanerozoic Eon

   Phanerozoic Eon 541m to today The eon we live in. Divided in the three eras Paleozoic, Mesozoic and Cenozoic.

7. Paleozoic Era

   Paleozoic Era 541m to 252m years ago. Divided in the six periods Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.

8. Mesozoic Era

   Mesozoic Era 252m to 66m years ago. The Age of Reptiles. Divided in the three periods Triassic, Jurassic and Cretaceous. Ended 66 million years ago.

9. Cenozoic Era

   Cenozoic Era The Age of Mammals and the era we live in. Subdivided in the three periods Paleogene, Neogene and Quaternary.

10. Alpha, beta, gamma