Pollen dating palynology

Such a change in circumscription could result in an expansion of the range of plant parts and/or preservation states that can be incorporated within the taxon.

For instance, a fossil-genus originally based on compressions of ovules could be used to include the multi-ovulate cupules within which the ovules were originally borne.

The Rhynie chert is an Early Devonian sinter (hot spring) deposit composed primarily of silica.

Those few examples of plant fossils that appear to be the remains of whole plants in fact are incomplete as the internal cellular tissue and fine micromorphological detail is normally lost during fossilisation.Although the name is always fixed to the type specimen, the circumscription (i.e.range of specimens that may be included within the taxon) is defined by the taxonomist who uses the name.Some dispersed, fragmentary fossils of disputed affinity, primarily spores and cuticles, have been found in rocks from the Ordovician Period in Oman, and are thought to derive from liverwort- or moss-grade fossil plants (Wellman, Osterloff & Mohiuddin 2003).An important early land plant fossil locality is the Rhynie Chert, found outside the village of Rhynie in Scotland.

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