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Chapter 5: Fossils and Geologic Time
Topic 4: The Geologic Time Scale
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Geologic Time videos animated song Mr.Parr song Mr.Parr music video
Earth history in a year's time
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Item #1 Based on the radiometric dating of rocks on Earth and from space (moon rocks, meteorites) the Earth is estimated to be ____________________________ years old. This span of time is known as _________________________ time 4.6 billion geologic
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Item #2 All of earth’s geologic time is divided into distinct intervals based on major events (changes) on Earth. These divisions are described by the _________ ______________ Geologic time scale
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Item #3 . The largest divisions of time are called ________________. We presently live in the ______________________ eon, which began about __________________________ years ago. This time span is marked by an abundant supply of different species of life on Earth. This eon is divided into three _____________ based on major changes to the profile of life on Earth. eons phanerozoic 550 million eras
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Item #4 The boundaries between eras are marked by major amounts of _____________________ to species. This represents the death of every member of a species. Many of these events are linked to global ___________________ change or catastrophic events such as a meteor impact. extinction climate
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Item #5 paleozoic The ______________________ era is known as the age of the “fish” (ancient marine life). It ended with a mass extinction that killed nearly __________ % of all species around at the time. Toward the end of this era, ____________________, ______________________, and ___________________ began to appear. The Appalachian mountains formed in North America during this era. 90 reptiles amphibians insects Note: All major land plants (non-flowering) evolved during this era.
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All time prior to paleozoic referred to as “pre-cambrian” era)
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Typical paleozoic life
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Item #6 mesozoic The ___________________________ era is known as the age of the reptiles (including dinosaurs). Small mammals and __________________ appeared toward the end of this era. The Rocky Mountains formed in North America during this time. This era ended with a mass extinction that killed about ____________ % of all species around at the time. birds 15-20 NOTE: Flowering plants and bees appeared late in this era.
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Item #7 cenozoic The ____________________________ era is the most recent and the one we live in today. It is known as the age of the _______________________ and includes the last ice age and the formation of the Himalaya Mountains. mammals
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