GLGY 307 Lecture Notes - Lecture 10: Paleontology, Essentialism, Nominalism
26 Dec 2017
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Module 4: principles of evolution: species distribution in space & time having as main purpose sediment & rock dating, assemblages zones, interval zones, acme zones, a biostratigraphical zone or biozone is defined as the fundamental unit in biostratigraphy. It represents a layer or group of layers with a fossil content distinct from those of the adjacent layers or groups of layers. Assemblage zones: general fossil content of a zone. Oppel zones: accent is put on the boundaries, which are defined by more than one species. Interval zones: fewer species are necessary to define a biozone. Acme zones: the abundance of one taxon or group of taxa is taken in consideration. It has limited applicability in the correlation at regional or intercontinental scale. Species variability: ontogentic: growth stages, genetic: genetic structure, nongenetic: environmental causes. Isometric: organism shape remains the same during the ontogeny: anisometric: organism shape changes.
