![]() ![]() They split the two sections apart and examine the fossil footprints inside. After the new layer has dried, groups exchange their plaster pieces. They cover it with non-stick cooking spray and then with a new layer of plaster (forming a cast). After the Plaster of Paris has dried, they paint it to look more realistic. ![]() Using Plaster of Paris and small plastic dinosaurs, they make a series of dinosaur foot tracks (forming a mold). In this investigation, students model the formation of a trace fossil. This process is much the same as the formation of body fossils. The sediment was then buried under more sediment and became compacted and cemented together to form rock. The sediment dried and hardened before the imprints could be erased by water or wind. The imprints left by the organisms were quickly covered by sediment. Most trace fossils were formed in soft mud or sand near a pond, lake, river, or beach. footprints), but only one set of hard parts (e.g. There are more trace fossils than body fossils because one organism can leave behind many traces (e.g. Another example is the footprints left by dinosaurs along an ancient river or the hollow tubes created by worms burrowing in soft mud in an ancient ocean. For example, a trace fossil is the trail left behind by an ancient reptile that dragged its tail in mud. Trace fossils include tracks, trails, burrows, feeding marks, and resting marks. In this investigation, students examine trace fossils, which are physical evidence of the life activities of now vanished organisms. In the last investigation, students learned about body fossils, fossils that are the actual organism or some part of it or the imprint of the organism or some part of it. ![]()
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March 2023
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