Why the fossil record tells an incomplete story of life
In short: This video explores how fossils form and why they provide such a fragmented view of Earth's biological history. It covers the mechanisms of preservation, from mineralisation to amber entrapment, and explains the drivers behind species extinction.
Fossils are defined as the remains or traces of long-dead organisms, including skeletons, impressions, and preserved bodies. They serve as primary evidence for evolution by documenting biological changes over time. However, the fossil record is inherently incomplete; early life forms often lacked hard parts to fossilise, and geological processes frequently destroy older remains.
The video breaks down preservation methods such as mineralisation—where minerals gradually replace hard parts like bone or shells—and the formation of casts and impressions. It also highlights specific environments that prevent decay, including amber, tar pits, ice, and peat bogs. Finally, it examines extinction drivers: rapid environmental shifts, new predators, disease, competition, and catastrophic events like asteroid impacts.
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Sources
- Summary by Intellect · source: GCSE Biology - Fossils & Extinction (2027/28 exams)
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