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 LengthUnits |
[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. |