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Difficulty: EasyEvidence for Evolution: Paleontology and Fossil Records

Arrange the following vertebrate fossil groups in chronological order of their appearance in geological rock strata, starting from the oldest (found in deeper strata) to the most recent (found in shallower strata).

  1. 1Jawless fishes
  2. 2Amphibians
  3. 3Reptiles
  4. 4Birds

Answer

The correct chronological sequence from oldest to most recent is: Jawless fishes, Amphibians, Reptiles, and Birds.
According to the principle of fossil succession in paleontology, simpler ancestral aquatic vertebrates (jawless fishes) appear in the oldest rock layers, followed sequentially by early tetrapods (amphibians), egg-laying land vertebrates (reptiles), and finally feathered descendants (birds).

Step-by-Step Solution

1
Identify the oldest vertebrate group in the fossil record
Jawless fishes are the earliest vertebrates preserved in deep Paleozoic strata.
Aquatic jawless vertebrates evolved prior to any land-dwelling vertebrate lineages.
2
Determine the first vertebrate group to transition to land
Amphibians appear next in the fossil sequence above fishes.
Lobe-finned fish ancestors gave rise to early land-dwelling amphibians during the Devonian period.
3
Identify the lineage that fully conquered dry land
Reptiles appear in layers above amphibians.
Reptiles evolved amniotic eggs allowing reproduction away from water bodies.
4
Identify the most recent group among the options
Birds appear in the uppermost strata among these four groups.
Birds evolved relatively late from theropod reptilian ancestors during the Mesozoic Era.

Key Concept

Faunal succession and chronological appearance of vertebrate lineages in fossil strata
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Topics

Evidence for Evolution: Paleontology and Fossil Records

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