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Fossils
What is a fossil?
• Preserved remains or traces of organisms
How do fossils form?
• death (unless it’s a track or coprolite)
• preservation– Quick burial in fine sediment &
mineralization of hard parts– desiccation– freezing– amber– asphalt
Preservation favored if…
• Organism has hard parts– Shells, bones, etc
• Only TINY percentage get preserved
Index Fossils
organisms thata. lived for a short timeb. throughout a wide
part of the world
• Correlate rock layers to the same time period
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