revised: 05-Feb-2015

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

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: XsectPoly

For simplicity, cross section lithologic polygon attibutes are identical to Lith_poly except that the Exposure field has been replaced with a Subsurface field which specifies whether the polygons 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.
GeoID " 16 String variable undefined FALSE Tb, QTa related to quad-specific lithologic detail table
Modified " 24 String CVD [null] TRUE breccia, fractured, altered, mineralized, etc
see: Modified		 Use where map unit is modified by some process to a degree that it should be shown differently on the map. Mineralization and Alteration can also be shown as overlays.
Label " 16 String variable [null] TRUE Tb, QTa? includes queries
Confidence " 16 String CVD certain TRUE unspecified, certain, probable, uncertain

confidence regarding feature level ID
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.
LthIDbasis LithIDbasis 50 String CVD exposed TRUE see: LithIDbasis Basis for identification of lithologic unit.
SourceID " 128 String variable [null]   unknown; unspecified; Smith, 2006b [variable] Feature level metadata (who mapped this); related to bibliographic detail
Descriptn Description 255 String variable [null] TRUE Description of unit in area of polygon (feature level)