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Zorluk: Çok zorEvidence for Evolution: Paleontology and Fossil Records

In paleontological studies of evolutionary history, sedimentary rock strata preserve a chronological record of major biological transitions. Arrange the following key fossilized organisms in order of their first appearance in the global geological record, starting from the oldest (earliest geological period) to the most recent (youngest geological period).

  1. 1Ediacaran fauna (e.g., Dickinsonia)
  2. 2Tiktaalik roseae
  3. 3Seymouria
  4. 4Archaeopteryx lithographica
  5. 5Eohippus (Hyracotherium)

Cevap

The correct chronological order from oldest to most recent geological appearance is: Ediacaran fauna (Precambrian) → Tiktaalik roseae (Devonian) → Seymouria (Permian) → Archaeopteryx lithographica (Jurassic) → Eohippus (Eocene).
The geological fossil record documents a clear temporal progression of life forms. Ediacaran fauna represent Precambrian multicellular organisms (~550 Ma). Tiktaalik roseae represents the Devonian transition of aquatic vertebrates to land (~375 Ma). Seymouria marks the Permian transition from primitive amphibians to early amniote/reptilian forms (~280 Ma). Archaeopteryx lithographica represents the Jurassic divergence of birds from theropod reptiles (~150 Ma). Eohippus represents Cenozoic mammalian radiation in the Eocene (~50 Ma). Ordering these from oldest to youngest gives: Ediacaran fauna → Tiktaalik roseae → Seymouria → Archaeopteryx lithographica → Eohippus.

Adım Adım Çözüm

1
Determine the geological time period associated with the first appearance of each fossilized taxon in the fossil record.
Ediacaran fauna (~550 Ma, Precambrian), Tiktaalik roseae (~375 Ma, Devonian), Seymouria (~280 Ma, Permian), Archaeopteryx lithographica (~150 Ma, Jurassic), and Eohippus (~50 Ma, Eocene).
Paleontological age determination relies on relative stratigraphy and radiometric dating of surrounding rock strata.
2
Order the corresponding geological eras and periods chronologically from earliest to most recent according to the principle of superposition.
Precambrian → Devonian → Permian → Jurassic → Eocene.
Lower, undisturbed sedimentary layers correspond to older geological time spans compared to upper, younger strata.
3
Map each fossil organism to its respective position on the established geological scale.
Ediacaran fauna → Tiktaalik roseae → Seymouria → Archaeopteryx lithographica → Eohippus.
This establishes the verified evolutionary sequence of major vertebrate and pre-vertebrate milestones.

Anahtar Kavram

Stratigraphic succession and chronological timeline of transitional fossils in paleontology
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Konular

Evidence for Evolution: Paleontology and Fossil Records

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