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Geologic Age values

Also see GeologicAgeDiscussion
Also see GenesisDesign

Scope Notes

A GeologicAge is the age of a particular GeologicEvent, an identifiable event during which one or more geological processes act to modify geological entities. A GeologicEvent must have a specified GeologicAge and may have specified environments and processes. An example might be a cratonic uplift event during which erosion, sedimentation, and volcanism all take place. Traditionally, geologists have described the age of a feature without explicitly specifying the event or processes the age related to. The GeologicEvent package allows for explicitly linking the three, without mandating it.

The eventAge attribute is the age of a particular geological event or feature expressed in terms of years before present (absolute age), referred to the geological time scale, or by comparison with other geological events or features (relative age). An eventAge can represent an instant in time, an interval of time, or any combination of multiple instants or intervals. Specifications of age in years before present are based on determination of time durations based on interpretation of isotopic analyses of EarthMaterial (some other methods are used for geologically young materials). Ages referred to geological time scales are essentially based on correlation of a geological unit with a standard chronostratigraphic unit that serves as a reference. Relative ages are based on relationships between geological units such as superposition, intruded by, cross-cuts, or ‘contains inclusions of’.

Geological history is an ordered aggregation of Geological Event objects, each of which may have an associated Geological Age, Geological Environment, and one or more Geological Process objects. In GeoSciML 2.0 the ordering of GeologicEvents cannot be specified.

GeoSciML ver2.0 Model

* Relationship between events, ages, processes and environments for version 2.0 at June 2007:
GeologicAge_6_2007.gif
Topic attachments
I Attachment Action Size Date Who Comment
GeologicAge_6_2007.gifgif GeologicAge_6_2007.gif manage 9.5 K 01 Jun 2007 - 14:52 BruceSimons Geologic Event for version 2.0 at June 2007
Topic revision: r15 - 15 Oct 2010, UnknownUser
 

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