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Lecture 10

GLGY 307 Lecture 10: Principles of Evolution
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3 Pages
55 Views
Fall 2017

Department
Geology
Course Code
GLGY 307
Professor
M.Dan Georgescu
Lecture
10

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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
Ontogenetic Morphologic Variability
Ontogenetic variability in the result of the organism growth during its lifetime
There are three stages during the lifetime of an organism
o Juvenile
o Adult
o Genontic
Ontogenetic trajectory: organism growth can be plotted to define the so-called
ontogenetic trajectory (illustrated in the case of two planktic foraminifers)
Types of Growth
Isometric: organism shape remains the same during the ontogeny
Anisometric: organism shape changes
Growth Strategies
Accretion: continuity in the development of the various skeletal parts
o Eg: mollusks, solitary corals, etc.
Addition: new skeletal parts are added throughout the ontogeny
o Eg: echinids, radiolarians
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Description
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 Ontogenetic Morphologic Variability Ontogenetic variability in the result of the organism growth during its lifetime There are three stages during the lifetime of an organism o Juvenile o Adult o Genontic Ontogenetic trajectory: organism growth can be plotted to define the so-called ontogenetic trajectory (illustrated in the case of two planktic foraminifers) Types of Growth Isometric: organism shape remains the same during the ontogeny Anisometric: organism shape changes Growth Strategies Accretion: continuity in the development of the various skeletal parts o Eg: mollusks, solitary corals, etc. Addition: new skeletal parts are added throughout the ontogeny o Eg: echinids, radiolarians 1
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