Geologic Time Power Point

Information about Geologic Time Power Point

Published on August 5, 2009

Author: bsndev

Source: authorstream.com

Content

Slide 1: Earth’s History Earth’s Formation Geologic Time Slide 2: The Earth is believed to have formed around 4 billion years ago. Gases and space rock and dust formed a dense ball that came together to form a core. Later, as it continued to be bombarded by asteroids the planet was larger and covered by volcanoes and molten lava fields and poisonous gases. Millions of years later as the Earth began to cool and become more stable, these gases combined to form water creating the oceans. Soon after, simple microscopic forms of life would appear called bacteria. Formation of the Earth Slide 3: From evidence gathered by the Apollo missions to the moon, scientists believe a large asteroid struck the Earth causing debris to rise up into space forming the moon. Soon an atmosphere of oxygen would replace the methane gas and carbon dioxide that was present. Billions of years later the first supercontinent would form called Pangaea. The continents of Earth reston plates that are in constantmotion. Because of this, thecontinents have drifted apartto form our modern daycontinents. This is called continental drift. Early Earth Slide 4: The largest span of time in the Geologic Time Scale is called Precambrian time. It starts at the formation of the Earth….4.6 billion years ago and runs to 544 million years ago. The Time Scale is then broken up into 3 major blocks of time called Eras. Geologic Time Paleozoic EraMeans – Ancient Life 544 – 245 Million Years Ago Commonly called “The Age of Trilobites” Organisms were well adapted for sea life with exoskeletons that were soft. Mesozoic EraMeans – Middle Animals 245 – 66 Million Years Ago Commonly called “The Age of Reptiles” Organisms were large and welladapted to life on land. Dinosaurs Cenozoic Era Means – New Life 66 Million Years Ago to Present Commonly Called “The Age of Mammals” Marked the demise ofreptiles and the rise of mammals including man. Organisms were covered withhair, fur, and feathers. Slide 5: Each Era is further divided into Periods. Geologic Time Paleozoic Era Cambrian Period Ordovician Period Silurian Period Devonian Period Carboniferous Period Permian Period Mesozoic Era Triassic Period Jurassic Period Cretaceous Period Cenozoic Era Tertiary Period Quaternary Period

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