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Chapter 5: Fossils and Geologic Time Topic 3: Fossils For Further Study.. • Fossil groups • Fossil Song • Trilobites DRA item #1 The remains or physical evidence of an organism preserved by fossil geologic processes is called a ______________________. These are most often preserved in sedimentary _________________________ rock but may also be found preserved in _________________________ , amber ________________________, or ______________. asphalt ice Fossilization in Rock Trace Fossils: Casts and Molds DRA item #2 Petrifaction _____________________________ is a process in which minerals replace an organism’s tissues. A good example of this is petrified _________________________ wood. Petrified Wood Petrified Dragonfly DRA item #3 Amber _________________________ is hardened tree sap and can preserve all parts (hard and soft) of small insects. ____________________ forms thick, sticky pools that Asphalt have trapped and preserved organisms that have lived in Ice more recent times. ____________________ contains almost no decomposing bacteria and can preserve organisms almost perfectly for tens of thousands of years. Fossil in Amber DRA item #4 The fossil record reveals a history of environmental ________________________ change. ___________________ fossils help reconstruct Marine ancient coastlines and the uplift of mountains. Fossils of plants and animals can help in the reconstructing of past ______________________. climates DRA item #5 By studying the relationships between fossils found in different parts of the geologic column, scientists can interpret how ________________ has changed life over time. Finally, using fossils of organisms that only existed for a short span of identified time, they can determine the absolute age of rock that they are found in without relying on radiometric dating methods. These types of fossils are known as ____________________________ and include index fossils such fossils as ________________ and ammonites ____________________________. trilobites (State fossil) Ammonite fossils Trilobite fossils Dunkleosteus fossil Dunkleosteus reconstructions 33 feet long! Geologic Time videos • • • • animated song Mr.Parr song Mr.Parr music video Earth history in a year's time