revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
POLYGONS: Overlays

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: Overlay_poly

This feature class represents overlays for texture, lithology, provenance, or other attributes of interest. The polygons are build from Overlay_line.

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.
OverlayID " 50 String variable [null] TRUE QTsf-axial  
Label " 50 String variable [null] TRUE QTsf-axial? includes queries
OvrlyClass OverlayClass 50 String variable [null] TRUE unspecified, textural, provenance, depo-system, quarry, mine, crater, etc Basis for overlay
OvrlyType OverlayType 50 String variable [null] TRUE texture: rounded, subrounded, subangular, angular; lithology: e.g. bioherm bed, etc; depo-system: nearshore, basin floor, etc; provenance: San Juan Mtns, Latir vf, etc.  
OverSubTyp OverlaySubType 50 String variable [null] TRUE texture: cobble, pebble, sand, clay (?); lith: secondary lith?; depo-system: upper? Lower? Etc.; provenance: ?  
Confidence " 16 String CVD [null] TRUE unspecified, certain, probable, uncertain

confidence regarding feature level ID
General_ID Generalized_ID 50 String variable [null] TRUE axial gravels How to Generalize this polygon.
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 area of polygon (feature level)