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27 Cards in this Set
- Front
- Back
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2 unique methods for preservation?
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Amber
Tar |
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Exceptional preservation site in Canada?
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Burgess Shale
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What is amber?
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Hardened tree resin
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What tree does the amber come from?
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Pinus Succinifera
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When did amber producing pines exist?
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Eocene
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Exceptional preservation requires what energy environments?
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Low
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Exceptional preservation requires a lack of what?
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Oxygen
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Exceptional preservation requires low what?
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Acidity
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Exeptional preservation can only occur when a fossil is rapidly covered in what?
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Fine sediment
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Why does there need to be a low acidity for exceptional preservation?
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Reduce decay
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Why does there need to be a lack of Oxygen for exceptional preservation?
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Reduce decay
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Why do organisms need to be covered in fine sediment for exceptional preservation?
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Preserve detail
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Why must diagenesis occur early in exceptional preservation
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Less alteration
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Define anaerobic?
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Without Oxygen
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Define Anoxic?
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Water without Oxygen
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What is often exceptionally preserved?
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Soft tissue
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What type of animals are exceptionally preserved?
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Marine
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Why are terrestrial animals not often exceptionally preserved?
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No rapid burial
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Terrestrial animals arent preserved unless they are near?
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Lakes
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How do tar pits form?
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Hydrocarbons migrate to give asphalt
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What accumalates on tar pits?
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Water
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What does tar pit water attract?
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Animals
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What happens to animals that drink water from tar pits?
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Get trapped
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What type of animals are often found in tar pits
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Predators
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When was the Burgess shale discovered
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1909
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When was the burgess shale formed?
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Cambrian
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What is abundant in the burgess shale?
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Arthropods
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