Multiple choice

Organisms are buried, liquids and gases are squeezed out, and a film of carbon is left.

  1. Carbon Films

  2. Trace Fossils

  3. Index Fossils

  4. Fossil Casts

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon films occur when an organism is compressed under high pressure, driving off liquids and gases. This leaves behind a thin, dark film of carbon that preserves the outline of the organism.