geological*time*scale*blogs.glnd.k12.va.us/mhope/files/2013/08/gts.pdf · historical*geology*...
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Historical Geology
Geological Time Scale
Historical Geology
Geological Time Scale
Historical Geology
Geological Time
Historical Geology
Precambrian (which can be divided into Archeozoic and Proterozoic eras): The Precambrian Era began 4.6 billion years ago, when life first appeared. Life-‐forms present were cyanobacteria, invertebrates – jellyfish, marine worms. The Precambrian Era was the longest era. It produced very few fossils. Bacteria formed O2, Ozone (O3) began to develop, and the atmosphere began to form.
Historical Geology
Paleozoic: The Paleozoic Era (the age of marine invertebrates) is the second oldest era of our Earth's history. Paleozoic means "Ancient Life" and lasted 345 million years. This is the first era in which scienSsts have found numerous fossils. It began about 600 million years ago with the first trilobites, a small, shelled sea creature resembling a modern crab. The Paleozoic is called the "Age of Fish". The conSnents were all connected into one huge landmass called Pangaea during the early Paleozoic.
Historical Geology
Mesozoic: Mesozoic means "Middle Life" and began about 225 million years ago and ended about 70 million years ago. This era is called the "Age of the RepSles". The era started with the rise of the dinosaurs. The first birds were evolved during the Mesozoic. The end of the Mesozoic was marked by the exSncSon of the dinosaurs.
Historical Geology
Cenozoic: The Cenozoic Era is also called the "Age of the Mammals". It began about 65 million years ago as the great lizards, the dinosaurs became exSnct. This led to a rise in the mammal populaSon. We are currently living in the Cenozoic Era, the Quarternary Period and the Holocene Epoch.
Historical Geology – Music Video
Historical Geology
We are currently in… Phanerozoic Eon Cenozoic Era Quaternary Period Holocene Epoch
Pre Cambrian
Historical Geology –Mass ExSncSons
Historical Geology
Historical Geology
Geological Time
Historical Geology
Geological Time
Historical Geology
Geological Time
Historical Geology
Historical Geology