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Geologic Time Chapter 9 section 1 Objectives • Explain why the _____________________ ____________ is useful. • List the major divisions of ____________ __________________. Why? • The surface of Earth is always _________ _________. • The changes are ___________________ _________________________________. • The geologic time scale outlines Earth’s __________________ & __________________ present during development. The Geologic Column • _____________________________________- standard ordered arrangement of rock layers that represents a timeline of Earth’s history • The __________ rocks are at the bottom. (DUH) • Distinctions are made by the types of ________ ____________________________ present • Fossils in the ______________ layers represent _______________ animals, fossils in the _____ _____ layers may be from _________________ animals The Geologic Column • The geologic column is useful for determining layers that formed at the same time even when they are at _______ __________________________ • Fig 1 p 211 Divisions of Geologic Time • Earth’s history is long, so it is broken down into manageable chunks of time • Divisions: _____________-largest chunks of time (4) ____________-smaller than eons—still very big ____________- characterized by specific fossils— area where fossils were first found _____________- rock record must be extensive __________- very distinct fossils usually named for Divisions of Geologic Time • The first _______ eons are known as Precambrian time. No further division due to ______________________. • ________________________ eon is broken into ______ eras – ___________________- many marine & land animal fossils – ___________________- early bird & reptile fossils fig 3 p 214 – ___________________- began ~__________ million years ago—fossils of mammals
