Contributions of Permineralized Plant Fossils to Plant Morphology

Fossils and plant phylogeny.

Developing a detailed estimate of plant phylogeny is the key first step toward a more sophisticated and particularized understanding of plant evolution. At many levels in the hierarchy of plant life, it will be impossible to develop an adequate understanding of plant phylogeny without taking into account the additional diversity provided by fossil plants. This is especially the case for relativ...

Plant Fossils in the Clarno Formation, Oregon

The Clarno formation was originally described by Merriam (1901) from outcrops at Mitchell and Clarno's Ferry, Oregon. Since that time the formation has been found to be very widely distributed throughout central Oregon (Wilkinson, 1959). It is composed of an unknown thickness of volcanic rocks and interfingering terrestrial sediments which contain a newly discovered vertebrate fauna and an abun...

A Quantitative Reassessment based on Plant Fossils

Native plant and microbial contributions to a negative plant-plant interaction.

A number of hypotheses have been suggested to explain why invasive exotic plants dramatically increase their abundance upon transport to a new range. The novel weapons hypothesis argues that phytotoxins secreted by roots of an exotic plant are more effective against naïve resident competitors in the range being invaded. The common reed Phragmites australis has a diverse population structure inc...

Organizational Contributions to Nuclear Power Plant Safety

S. TINA GHOSH and GEORGE E. APOSTOLAKIS US Nuclear Regulatory Commission Office of Nuclear Material Safety and Safeguards Mail Stop: T-7F27 Washington, DC 20555, USA Massachusetts Institute of Technology Department of Nuclear Science and Engineering, and Engineering Systems Division 77 Massachusetts Avenue, Room 24-221, Cambridge, MA 02139-4307, USA Corresponding author. E-mail : [email protected]...