Arrange the following plant fossil groups in chronological order of their first major appearance in the geological rock record, starting from the oldest (deepest strata) to the most recent (youngest strata).
- 1Primitive vascular spore-bearing land plants (e.g., Cooksonia)
- 2Coal-forming giant lycophytes and primitive seed ferns
- 3Early cone-bearing gymnosperms (e.g., cycads and conifers)
- 4Flowering plants (angiosperms)
Answer
The correct chronological sequence of plant group appearances in the fossil record from oldest to most recent is: Primitive vascular spore-bearing land plants, followed by coal-forming giant lycophytes and seed ferns, then early cone-bearing gymnosperms, and finally flowering plants (angiosperms).
The fossil record demonstrates a clear evolutionary succession of plant groups preserved in sedimentary rock layers over geological time. Lower (older) Silurian strata contain primitive spore-bearing vascular plants, followed by Carboniferous coal-forming lycophytes and seed ferns. Mesozoic layers show the dominance of cone-bearing gymnosperms, while upper (younger) Cretaceous strata record the emergence and diversification of flowering angiosperms.
Step-by-Step Solution
Key Concept
Paleobotanical succession in geological rock strata