Paleobotany
Paleobotany studies the fossil record of plants, tracing the greening of the land and the rise of forests, seeds, and flowers through deep time.
Definition
Paleobotany is the branch of paleontology concerned with fossil plants, reconstructing their structure, reproduction, classification, and evolutionary history and the vegetation of past environments.
Scope
This area covers the fossil record of plants from early land colonizers to flowering plants, including their anatomy and reproduction, modes of preservation, major evolutionary innovations, and the use of plant fossils in reconstructing past climates and terrestrial ecosystems.
Sub-topics
Core questions
- How and when did plants colonize the land?
- What major innovations shaped plant evolution, such as seeds and flowers?
- How are fossil plants preserved and reconstructed as whole organisms?
- How do plant fossils record past climate and atmospheric change?
Key concepts
- Terrestrialization
- Vascular tissue and the seed habit
- Whole-plant reconstruction
- Plant fossils as climate proxies
Key theories
- Terrestrialization of plants
- The colonization of land by plants in the Ordovician to Devonian transformed continents, soils, and the carbon cycle, documented by early spores and simple fossil plants.
- Key reproductive innovations
- The successive origins of vascular tissue, seeds, and flowers were major innovations that restructured terrestrial ecosystems through plant evolution.
Clinical relevance
Plant fossils reconstruct ancient terrestrial ecosystems and serve as proxies for past temperature and atmospheric carbon dioxide, while fossil plant deposits such as coal are major energy resources with deep economic significance.
History
Paleobotany grew from nineteenth-century studies of coal-forming plants and the discovery of exceptional fossil floras such as the Rhynie chert. Twentieth-century anatomical and reconstructive work, combined with palynology, built a comprehensive picture of plant evolution.
Debates
- Timing and pattern of land-plant origins
- The exact timing and ancestry of the earliest land plants are debated between molecular clocks and the sparse early fossil record.
Key figures
- Thomas N. Taylor
- Wilson N. Stewart
- Kathy Willis
Related topics
Seminal works
- taylor2009
- stewart1993
Frequently asked questions
- What is paleobotany?
- Paleobotany is the study of fossil plants, using their preserved structures to reconstruct how plants evolved and what ancient vegetation and climates were like.
- When did plants first grow on land?
- Evidence from early spores and simple fossils indicates plants began colonizing land in the Ordovician and diversified greatly through the Devonian.