Paleontological evidence demonstrates that different organism groups appeared at distinct geological times, creating a recognizable biostratigraphic sequence in undisturbed rock layers. Arrange the following fossil groups in chronological order of their first appearance in the fossil record, starting from the oldest (deepest rock stratum) to the most recent (shallowest rock stratum).
- 1Trilobites (marine arthropods characteristic of the early Paleozoic Era)
- 2Placoderms (armoured jawed fishes of the mid-Paleozoic Era)
- 3Archaeopteryx (transitional reptile-bird fossils of the Mesozoic Era)
- 4Australopithecus (early hominid fossils of the late Cenozoic Era)
Cevap
The correct chronological sequence from oldest to most recent fossil record appearance is: Trilobites, Placoderms, Archaeopteryx, and Australopithecus.
The correct order follows biostratigraphic succession based on the law of superposition. Trilobites appeared first in the early Paleozoic (Cambrian), followed by placoderm jawed fishes in the mid-Paleozoic (Silurian). Archaeopteryx evolved later during the Mesozoic (Jurassic), and Australopithecus represents modern hominid lineage appearance in the late Cenozoic (Pliocene).
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Biostratigraphic Succession and Law of Superposition
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