revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
SYMBOLOGY: Linear Features - 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 document indicates how folds portrayed on a geologic map should be coded in the data model. See the NMBGMR Symbol set (3.7 Mb PDF) for details on how our standard symbology is constructed.

Folds

Description Symbol Feature Classes & Attributes Comment
fold-[general] anticline Fold_line
  • Geometry=[variable]
  • Attitude=[variable]
  • FoldLnType=[variable]
  • Confidence="certain"
  • Exposure="exposed"
  • Facing=[variable]
Feature_point
  • FeatrClass="good exposure"
Triangle indicates superior exposure.
fold-syncline anticline Fold_line
  • Geometry="syncline"
  • Attitude="plunging"
  • FoldLnType="axial trace"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="upward"
Fold_point
  • MappedFeature=TRUE
  • Geometry="syncline"
  • Attitude="plunging"
  • Facing="upward"
  • FldAxisTrd="045"
  • FldAxisPlg="25"
Fold_symbol
  • SymClass="fold"
  • Geometry="syncline"
  • Attitude="plunging"
  • RotaAngle=[variable]
 Arrows are placed by the position of the Fold_Symbol point.
fold-syncline-overturned anticline Fold_line
  • Geometry="syncline"
  • Attitude="inclined-plunging"
  • FoldLnType="axial trace"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="N"
Fold_point
  • MappedFeature=TRUE
  • Geometry="syncline"
  • Attitude="incline-plunging"
  • MapAsymm="Z-fold" FldAxisTrd="045"
  • FldAxisPlg="25"
Fold_symbol
  • SymClass="fold"
  • Geometry="syncline"
  • Attitude="plunging"
  • RotaAngle=[variable]
 [Fold faces North because younger beds are to the North.]
fold-synform anticline Fold_line
  • Geometry="synform"
  • Attitude="plunging"
  • FoldLnType="axial trace"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="unknown"
Fold_symbol
  • SymClass="fold"
  • Geometry="synform"
  • RotaAngle=[variable]
  
fold-anticline anticline Fold_line
  • Geometry="anticline"
  • Attitude="plunging"
  • FoldLnType="axial trace"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="upward"
Fold_symbol
  • SymClass="fold"
  • Geometry="anticline"
  • RotaAngle=[variable]
  
fold-anticline-overturned fold symbol Fold_line
  • Geometry="anticline"
  • Attitude="inclined-plunging"
  • FoldLnType="axial trace"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="S"
Fold_symbol
  • SymClass="fold"
  • Geometry="anticline"
  • Attitude="inclined"
  • RotaAngle=[variable]
 [Facing is to the south because younger beds are to the south.]
fold-antiform anticline Fold_line
  • Geometry="antiform"
  • Attitude="plunging"
  • FoldLnType="axial trace"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="unknown"
Fold_symbol
  • SymClass="fold"
  • Geometry="antiform"
  • RotaAngle=[variable]
  
fold-monocline, plunging anticline Fold_line
  • Geometry="monocline"
  • Attitude="plunging"
  • FoldLnType="inflection"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="N"
Fold_symbol
  • SymClass="fold"
  • Geometry="monocline"
  • FoldLnType="inflection"
  • RotaAngle=[variable]
  
fold-monocline-synclinal bend, plunging anticline Fold_line
  • Geometry="monocline"
  • Attitude="plunging"
  • FoldLnType="synclinal"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="N"
Fold_symbol
  • Geometry="monocline"
  • SymSubType="synclinal"
  • RotaAngle=[variable]
  
fold-monocline-anticlinal bend anticline Fold_line
  • Geometry="monocline"
  • Attitude="plunging"
  • FoldLnType="anticlinal"
  • Confidence="certain"
  • Exposure="exposed"
  • Facing="N"
Fold_symbol
  • Geometry="monocline"
  • SymSubType="anticlinal"
  • RotaAngle=[variable]