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Fossils: Formation and Classification

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Fossils: Formation and Classification

  1. 1. FOSSILS: FORMATION AND CLASSIFICATION By: Mr. Marjonlien A. Mahusay
  2. 2. FOSSIL - the remnants or trace of ancient living organisms that has been preserved in rock or sediment Kinds of rocks containing fossil 1. Sedimentary rocks 2. Volcanic ash deposits
  3. 3. Fossilization - process of forming a fossil
  4. 4. Kinds of fossils 1. Frozen or dried bodies 2. Fossils preserved in an amber or tar
  5. 5. 3. Preserved or replaced bones, teeth and shells 4. Petrified (premineralized) organisms  Turn into stone
  6. 6. 5. Mold and cast 6. Carbonized impressions 7. Trace fossils
  7. 7. Fossil preservation 1.Death in an anoxic (oxygen free) environment 2. Rapid burial 3. Presence of hard parts
  8. 8. Classifying fossils • according to its morphology alone Naming: • Compared fossil forms from known organisms Ex. Fossil organize with spiral shell that does not contain internal chamber is classified as a member of class gastropoda
  9. 9. Common invertebrate fossil Trilobites- 3 segmented shell that is divided across its width into 3 parts (arthropod) Gastropods (snails)- spiral shell, does not contain internal chamber Bivalves (clams & oysters) – shells that can be divide into 2 similar halves
  10. 10. Brachiopods – resemble screen like grid of cells Crinoides – looks like a flower, stalks consist of numerous circular plates stacked on top of each other
  11. 11. Grapholites – tiny carbon saw blades in a rock Ammonites – spiral straight shell that contains internal chambers and has ridge surface Corals
  12. 12. THANK YOU FOR LISTENING!!!

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