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Fossils: Windows into the Past

Fossils: Windows into the Past. Essential Question: Explain the use of fossils as evidence of Earth’s history and its life forms. Agenda. Monday – Data Sheet Tuesday – Wednesday – Thursday – Quiz Friday –. Vocabulary . Paleontology Fossil Fossil Record Mold Cast. Petrified

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Fossils: Windows into the Past

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  1. Fossils: Windows into the Past Essential Question: Explain the use of fossils as evidence of Earth’s history and its life forms.

  2. Agenda • Monday – Data Sheet • Tuesday – • Wednesday – • Thursday – Quiz • Friday –

  3. Vocabulary • Paleontology • Fossil • Fossil Record • Mold • Cast • Petrified • Preserved • Carbonized • Trace • Trilobite

  4. Concept • Uses of Fossils • Types of Fossils

  5. Describe what you see in this picture. • What is it? • Where do you think it is? • How did it get there? • What inferences can you draw from it?

  6. Paleontology • The study of fossil evidence to learn about ancient life forms.

  7. Fossil • The preserved remains of organisms that lived in the distant past. • Can also be evidence of organisms’ behaviors that were preserved.

  8. Fossil Record • The evidence provided by fossils about what Earth was like millions of years ago. • Clues provided include: • Climate & atmosphere changes. • Geology – plate tectonics, erosion. • Diversity of life on Earth – different organisms that have lived and how they have changed.

  9. #1 – Mold Fossil • Sediments bury an organism and change into rock. Over time the organism decays and leaves a cavity (hole) in the shape of the organism.

  10. #2 – Cast Fossil • When a mold fossil is filled with sand or mud that hardens into the shape of the organism.

  11. #3 – Petrified Fossil • When minerals soak into buried remains, replace the remains, and then change into rock.

  12. #4 – Preserved Fossil • Forms when organisms do not decay at all because they are trapped in rock, ice, tar, or amber.

  13. #5 – Carbonized Fossil • Body parts like leaves, stems, and flowers are pressed between layers of soft mud that hardens. • It squeezes away the decayed organism leaving only an imprint.

  14. #6 – Trace Fossil • Mud or sand hardens into stone where a footprint, trail, or burrow of an organism was left behind.

  15. Example: Trilobite • Ranged in size from 1-3 inches to 2-3 feet. • Existed for almost 300 million years. • Went extinct about 250 million years ago. • Related to today’s horseshoe crabs.

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