Other questions in this quiz

2. an external mould has what features of the shell?

  • External features
  • soft parts only
  • interal features
  • mostly hard parts

3. in replacement what does unstable aragonite change to?

  • silica
  • Calcite
  • Carbon
  • it doesn't change

4. what conditions are need for pyritisation?

  • shallow sea
  • sulfur bacteria and oxygen
  • Anaerobic and sulfur bacteria
  • sandy sediment

5. What are exceptional methods of preservation?

  • carbonisation and silicification
  • Tar and pyritisation
  • Amber and Tar
  • carbonisation and amber


James Disney


Petrified wood is an example of Silicification, not pyritisation

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