revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
LINES - Mapped Folds

In the interests of standardization and interoperability, we are migrating our geologic maps into the USGS NCGMP09 data model. However, our well data model is still actively being used. Documentation for the NMBGMR geology data model is being provided for users with legacy data in this model. We also hope that it will provoke discussion in the ongoing effort to improve NCGMP09 and other models.


This feature class represents mapped folds. Measured fold data is recorded as point data in fold_point which lie along these lines. Definition queries will be required to split out the FoldClass attributes since ArcGIS can only symbolize on permutations of 3 attributes.

Field Name Field Alias Length
(text fields)
Field Type Field Value Default Allow Nulls? Attributes / Examples Description / Notes
FGDC_code " 16 String variable [null] TRUE 30.3.12 FGDC geologic symbol reference number.
Geometry " 24 String CVD
[null] TRUE anticline, syncline, etc.
see: FoldGeometry
Fold geometry; (this mixes younging with geometry, but is simpler than having a field for shape and one for younging because having "synformal syncline" on a map legend seems like overkill).
Confidence " 16 String CVD [null] TRUE unspecified, certain, probable, uncertain

Confidence regarding the existence/identification of this feature.

Exposure " 16 String CVD [null] TRUE unspecified, exposed, obscured, concealed Exposure of this feature at the surface.
ShowMarker ShowMarkerSymbol   Short Integer boolean 1 (TRUE) FALSE 1=yes/TRUE (show line decoration)
0=no/FALSE (don't show)
Toggle to show or not show line decoration (e.g. syncline symbol) for this line segment.
FoldLnType FoldLineType 50 String CVD [null] TRUE hinge line, axial trace, etc.
see: FoldLineType
Fold line type.
Attitude " 20 String CVD [null] TRUE inclined-plunging, reclined, recumbent, etc.
see: FoldAttitude
Fold attitude defined by plunge of the hinge and the dip of the axial surface.
ShowPlunge "   short integer CVD [null] TRUE [null], 1 [single], 2 [double]
see: ShowPlunge
Specifies if plunge arrows should be drawn, for 1 (single arrow), line may need to be flipped for correct display.
FoldGen FoldGeneration 16 String CVD [null] TRUE F1, F2, F3, etc.
see: FoldGeneration
Would be basis for symbology for superposed folds
TypeEvidnc TypeEvidence 20 String CVD [null] TRUE see: FoldTypeEvidence Geologic evidence used to determine fold type.
MapAsymm MapAsymmetry 16 String CVD [null] TRUE hinge, sinistral, dextral, M-fold, Z-fold, S-fold
see: FoldMapAsymmetry
Map view asymmetry of fold
FoldStyle " 24 String CVD [null] TRUE open, close, tight, isoclinal, etc.
see: FoldStyle
Fold style based on various fold classification schemes.
Facing " 16 String CVD [null] TRUE see: FoldFacing Facing where known (direction towards stratigraphically younger rocks from fold hinge). See-vergence for inclined folds.
YoungCrit YoungingCriteria 16 String CVD [null] TRUE see: YoungingCriteria Younging criteria used.
Vergence " 16 String CVD [null] TRUE N,NE,E,SE,S,SW,W,NW
see: OctantDirections
Vergence of fold (the orientation of the younging "vector" when it is not vertical).
Name " 50 String variable [null] TRUE Hondo Syncline Fold name (linked to point tables)
StructRlf StructuralRelief   Single variable [null] TRUE amplitude of fold Structural relief of the amplitude of the fold.
Units " 16 String CVD
[null] TRUE unspecified, km, meters, cm, mm, miles, feet, inches Units of structural relief.
DsplyScale DisplayScale   Long Integer CVD 24000 TRUE see: DisplayScale Denominator of display scale: display feature at scales larger than number specified (=< denominator). Zero indicates data that should never be displayed.
SourceID " 128 String variable [null] TRUE "Smith, 1999a" Feature level metadata (who mapped this)
Comments " 255 String variable [null] TRUE   Comments about this particular feature.