F
- FabricDescription
- The FabricDescription class describes all types of fabrics associated with a CompoundMaterial (ie, tectonic, metamorphic, sedimentary, igneous fabrics or textures). It denotes a pattern, defined by one or more CompoundMaterial constituents, that is present throughout a rock body when considered at some scale. FabricDescription is defined based on the average configuration of many constituents. Penetrative fabric denotes that these constituents are distributed throughout the rock volume at the scale of observation [Passchier and Trouw, 1998], and are repeated at distances that are small relative to the scale of the whole, such that they can be considered to pervade the whole uniformly (Turner and Weiss [1963] p. 21-24; Hobbs and others [1976], p. 73; Jackson [1997]; Passchier and Trouw [1998]).
FabricDescription is distinguished from Particle Geometry based on the criteria that Particle Geometry is preserved if a CompoundMaterial is disaggregated, while FabricDescription is not defined if the material is disaggregated.
Use gml:description to capture any free text to indicate any specific or peculiar features of the described fabric in the CompoundMaterial.
- FabricTypeTerm
- Refers to a vocabulary of terms describing the type of fabric present
- FaultSystem
- A composite structure that is an aggregation of genetically related instances of Faults and/or DuctileShearStructures. A FaultSystem is composed of individually identified and mapped Faults and/or DuctileShearStructures that are considered distinct ShearDisplacementStructures, that generally form overlapping, anastomosing patterns in which, at any point along the fault system, multiple fault strands are identified and each considered important at the scale of description. Displacement and other descriptive data may be assigned at the 'fault segment', 'fault', or 'fault system level'.
- FaultTypeTerm
- A vocabulary of terms describing the type of shear displacement structure (eg; thrust fault, normal fault, wrench fault)
- Fold
- One or more systematically curved layers, surfaces, or lines in a rock body. Fold denotes a structure formed by the deformation of a GeologicStructure to form a structure that may be described by the translation of an abstract line (the fold axis) parallel to itself along some curvilinear path (the fold profile). Folds have a hinge zone (zone of maximum curvature along the surface) and limbs (parts of the deformed surface not in the hinge zone). Folds are described by an axial surface, hinge line , profile geometry, the solid angle between the limbs, and the relationships between adjacent folded surfaces if the folded structure is a Layering fabric (similar, parallel).
- FoldProfileTypeTerm
- Refers to a vocabulary of terms specifying concave/convex geometry of fold relative to earth surface, and relationship to younging direction in folded strata if known. antiform, synform, neutral, anticline, syncline, monocline, ptygmatic
- FoldSystem
- A collection of congruent folds (axis and axial surface are parallel) produced by the same tectonic event. Sometimes referred to as a "Fold Train".
- Foliation
- A planar arrangement of textural or structural features in any type of rock. Includes any of a wide variety of penetrative planar geological structures that may be present in a rock. Examples include schistosity, mylonitic foliation, penetrative bedding structure (lamination), and cleavage. Following the proposed definition of gneiss by the NADM Science Language Technical Team, penetrative planar foliation defined by layers > 5 mm thick is considered Layering.
Bedding as a fabric representing the average orientation of paleodepositional surface should be encoded through the foliationType; might apply to bedding that is layering or a foliation without layering (e.g. clast alignment in amalgamated beds).
- FoliationTypeTerm
- Refers to a vocabular of terms defining the type of foliation (eg, crenulation cleavage, gneissic layering, slaty cleavage, schistosity, etc)
- Fossil
- The Fossil package is provided for information only. It is not encoded as part of the GeoSciML schemas. Associations to other GeoSciML packages are all byReference only.
FossilMolds and TraceFossils are modelled as types of non-directional GeologicStructures. Fossils are linked to living or once living things by the Organism class.
Fossils that occur as constituent parts of rocks are described as particleType = "fossil". Fossils are linked (byReference) to living or once living things by the Organism class.
Fossil specimens are modelled as O&M SF_Specimen, with specimenType = "fossil". Results of observations on that specimen can describe the fossil.
- Fracture
- Fractures are cracks in the earth surface. If there is no displacement it is a joint. If there is displacement and you are in the brittle zone it is a fault. In the ductile zone, a fracture with displacement with fracture is called a shear. FaultSurface as a separate class is not considered necessary for GeoSciML 2.
Recording observations on FaultSurface should be in observation and measurement. The observation needs to be able to distinguish the type of measurement made (PropertyType)