Key Idea.
Section 1
Fossils Show Evidence of Past Life
A fossil serves as a biological record preserved within the geological record. It is not usually the organism itself, but rather the preserved evidence that a plant or animal once lived in that location.
Fossils can take many forms, including preserved bones, shells, leaf impressions, or footprints. By studying these traces, scientists can reconstruct what life was like in Earth's distant past.
Section 2
Sediment Buries and Preserves Remains
Fossilization requires specific conditions. For an organism to become a fossil, its remains must be covered quickly by sediment after death. This rapid burial protects the remains from scavengers and decay.
Over millions of years, as the sediment turns into rock through compaction and cementation, the remains are trapped and preserved within the rock matrix. This process turns a biological object into a geological feature, permanently recording it in the Earth's crust.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter
Expand to review the lesson summary and core properties.
Section 1
Fossils Show Evidence of Past Life
A fossil serves as a biological record preserved within the geological record. It is not usually the organism itself, but rather the preserved evidence that a plant or animal once lived in that location.
Fossils can take many forms, including preserved bones, shells, leaf impressions, or footprints. By studying these traces, scientists can reconstruct what life was like in Earth's distant past.
Section 2
Sediment Buries and Preserves Remains
Fossilization requires specific conditions. For an organism to become a fossil, its remains must be covered quickly by sediment after death. This rapid burial protects the remains from scavengers and decay.
Over millions of years, as the sediment turns into rock through compaction and cementation, the remains are trapped and preserved within the rock matrix. This process turns a biological object into a geological feature, permanently recording it in the Earth's crust.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter