Geologic surface ORM diagram

This object-role modeling (ORM) diagram sample shows schema for geologic surface. It was designed on the base of the Wikimedia Commons file: Schema for Geologic Surface.svg. [commons.wikimedia.org/wiki/File:Schema_for_Geologic_Surface.svg] This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. [creativecommons.org/publicdomain/zero/1.0/deed.en] "The Geologic Surface ... schema requires that a Geologic Surface have a type attribute that determines the subclass membership for the surface, and an attribute that indicates if the surface is directed. A characteristic Thickness of the surface may also be defined. Fault surfaces have associated Slip Vectors that record displacements across the fault. A Fault may have several associated slip vectors if displacement is known to have changed over time. Faults and Contacts both have associated Age Ranges. For a Fault, the age range is the time interval during which the fault was active. For active faults, the lower bound of this range is 0. Faults may have more than one associated age range to allow for more than one period of activity. Distinct age ranges may be related to distinct slip vectors to record the full displacement history of a Fault. The age range associated with Contacts represents the time interval that separates rocks on either side of the Contact. Only one age range may be associated with a Contact. Degenerate Volumes are entities used to represent descriptions of a discrete layer or a boundary layers that is too thin at the scale of representation to depict on a map. Examples include soil profiles, dikes, veins, fault rocks, and marker beds. A Degenerate Volume surface is associated with a Rock Unit classification object that describes the lithologic characteristics of the material in the boundary layer. A thickness must be defined for a Degenerate Volume surface." [pubs.usgs.gov/of/1999/of99-386/richard.html] The object-role modeling diagram example "Geologic surface ORM diagram" was designed using ConceptDraw PRO software extended with ORM Diagrams solution from Software Development area of ConceptDraw PRO Solution Park.