Fossils

Fossils

1. Fossils are the remains of plant and animal from many years ago

2. 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
   • 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)
       • When footprints in clay (soft material) leaving a impression when then it harden.
   • 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.
     • Glaciers
       • Too cold for decay microbes can't survive
     • Peat bogs
       • Too acidic for decay microbes to survive