Exceptional preservation
- Created by: annaleighkelly
- Created on: 09-06-16 15:07
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- Amber
- Animals become trapped in the resin
- Flows from cracks in bar and accumulates on branches
- Tree resin that has hardened and been prserved
- Exceptional preservation
- Tar
- Tar pits formed when hydrocarbons that had migrated upwards formed pools of alsphalt
- Water accumulated on top of the tar, enticed animals
- Animals that became trapped attracted other animals
- The Burgess shales
- The animals are of Cambrian age and all extinct e.g. trilobites
- The soft tissues are replaced by a type of clay mineral
- Incomplete fossil record
- The fossil record is biased
- When an organism dies, bacteria act to decompose the soft parts
- Animals without hard parts are poorly represented
- Tar
- Them amber then becomes much harder by a series of chemical reactions
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