revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
Cross Sections: Contacts

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.

Feature Class: XsectLines

This feature class represents contacts between geologic units portrayed on a cross section. For simplicity, cross section contact attibutes are identical other line feature classes except that the Exposure field has been replaced with a boolean Subsurface field which specifies whether the contacts represent features in the sub-surface or features projected above the surface. This will allow alternate symbolization, like transparency effects, to be applied to features above the surface.

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 LineClass 50 String CVD contact FALSE contact, fault, profile, surface, intra-unit, dike, vein, well, etc.
see: XsectLineClass
Basic class of line.
IDmethod " 50 String CVD field evidence TRUE see: IDmethod The basis for identification of this feature.
Confidence " 16 String CVD certain TRUE unspecified, certain, probable, uncertain Confidence regarding the existence/identification of this feature.
Subsurface "   Small integer boolean 1 (TRUE) FALSE 1=subsurface, 0=above surface TRUE for features beneath the ground surface and FALSE for features projected above ground.
Name " 50 String variable [null] TRUE great unconformity, K-T boundary, etc Feature name (will generally be NULL)
SourceID " 128 String variable [null] TRUE "Smith, 1999a" Feature level metadata (who made this interpretation)
Comments " 255 String variable [null] TRUE Free text e.g. identified from detailed stereo photos Comments about this particular feature.