revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
LINES - Mapped Linear Features

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 linear geologic features like ashes, marker beds, or dikes that do not have sufficient area to be mapped as polygons. Features that are not linear and don't occupy enough area to be mapped as polygons can be recorded as Feature_points.

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.
LineClass " 50 String CVD [null] TRUE see: FeatureLineClass Class of mappable linear geologic feature.
GeoID " 16 String variable [null] TRUE Tb, Ti, etc Same GeoID as used for lithologic polygons. related to quad-specific lithologic detail table
Label " 16 String variable [null] TRUE Tb, Ti?, etc. includes queries
IDmethod " 50 String CVD [null] TRUE see: IDmethod The basis for identification of this feature.
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.
LineType " 50 String variable [null] TRUE unspecified, fall, surge, reworked, pegmatite, quartz, carbonate, basalt, andesite, rhyolite, [crater] margin, [flow] margin, etc. Type of linear geologic feature of specifed class.
LineSubTyp LineSubType 50 String variable [null] TRUE unspecified, ? Subtype of linear geologic feature of specifed type.
Name " 50 String variable [null] TRUE White ash #4 (linked to point tables) Feature name (will likely be NULL for most features)
Younging " 16 String CVD [null] TRUE unspecified, unknown, upright, overturned Determination of younging "vector'.
YoungCrit YoungingCriteria 16 String CVD [null] TRUE see: YoungingCriteria Younging criteria used.
Thickness "   Single variable [null] TRUE average thickness of feature Thickness or width of feature where important.
ThickUnits " 8 String CVD [null] TRUE [null] meters, feet, etc.
see: LengthUnits
Units of thickness.
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.