866545
Description
Mind Map by Evangeline Taylor, updated more than 1 year ago
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Created by Evangeline Taylor
almost 11 years ago
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Fossils
- Fossils are the remains of plant and animal
from many years ago
- Fossils form in rock in one of three ways:
- 1) Form Gradual Replacement by
minerals ( Most Fossils happen
this way)
- Teeth, shells, bones ect... - don't
decay easily
- Eventually replaced by
minerals as they decay
forming a rock like
substance
- Eventually replaced by
minerals as they decay
forming a rock like
substance
- Teeth, shells, bones ect... - don't
decay easily
- 2) From casts and
impressions
- Sometime fossils are form when
organism is buried in soft materials
(like clay)
- It hardens around it, organism decay
- Leaving a cast (i.e Animal borrow
or plants roots)
- Leaving a cast (i.e Animal borrow
or plants roots)
- When footprints in clay (soft
material) leaving a impression
when then it harden.
- It hardens around it, organism decay
- Sometime fossils are form when
organism is buried in soft materials
(like clay)
- Form Preservation in place
where no decay happens
- In Amber ( Fossilised resin)
- Like in Juarssic Park
- No oxygen or moisture so decay
microbes can't survive.
- Like in Juarssic Park
- Glaciers
- Too cold for decay
microbes can't survive
- Too cold for decay
microbes can't survive
- Peat bogs
- Too acidic for decay
microbes to survive
- Too acidic for decay
microbes to survive
- In Amber ( Fossilised resin)
- 1) Form Gradual Replacement by
minerals ( Most Fossils happen
this way)
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