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Name_____________________________________ #_______ Date_________________ Hour______ Center #3: Investigating Geologic Time and Fossils Part I Introduction Directions: Read the Introduction to answer the questions that follow. Fossils are preserved remains of past life or trace evidence of such life in the Earth’s crust. Rapid burial is a primary factor in fossilization. Marine plants and animals are fossilized more frequently than land organisms because they undergo rapid burial more readily. One of a number of processes may lead to fossilization. These processes may be as simple as freezing of an animal or as complex as minerals filling voids in the bone or the shell of an organism. For identification, geologists will study and examine the structure and the smallest parts of the fossil. In addition they will also evaluate the geologic environment that the fossil came from (land, shallow sea, lake, etc.) by looking at the types of rocks the fossil was found in and the other fossils in the area. Geologists often use this saying: “The present is the key to the past”. Part II Questions Directions: Use the passage from Part I to answer the questions. 1. What are fossils?_______________________________________________________________________ _______________________________________________________________________________________ 2. Identify two ways organisms are fossilized: ___________________________________________________ _______________________________________________________________________________________ 3. What do you think the phrase “The present is the key to the past” means to geologists? _______________ ________________________________________________________________________________________ ________________________________________________________________________________________ Part III Fossil Exploration Directions: Ask the teacher for the rock mixture. 1. Use the plastic tweezers to sort through the mixture. You are looking for fossil specimens. The fossils will be the specimens that have some symmetry to them or look like a once-living creature. 2. Your goal is to locate and identify fossils of at least eight different fossils in the rock mixture. 3. When you have separated the fossils from the gravel mixture use the magnifying lens to examine them. You should be able to match the fossils to the information sheet in the tub. 4. Fill in the chart on the back of this page. Part IV Analysis Directions: Use your textbook to help you answer the questions. 1. Look up mold and cast. Compare and contrast these terms in the Venn diagram below: 2. Were the fossils you found in the mixture molds or casts? Explain: Fossil Investigation Chart Fossil # 1 2 3 4 5 6 Major Group Specific Group Age Niche Habitat Interesting Number Fact Found
