revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
POLYGONS: Lithologic Units

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.

Contents:

Feature Class: Lith_poly

This feature class represents geologic units, water, or anthropogenic deposits (built from contacts and faults) that occupy mappable areas. These polygons are built from contacts. Detailed information about each unit is provided via a link based on the GeoID field to a lithology table.

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 [null] TRUE 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 [null] TRUE unspecified, certain, probable, uncertain

confidence regarding feature level ID
LthIDbasis LithIDbasis 50 String CVD [null] TRUE exposed, float, etc.
see: LithIDbasis		 Basis for identification of lithologic unit.
General_ID Generalized_ID 16 String variable [null] TRUE Qsf

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 unit in area of polygon (feature level)  

Feature Class: Lith_poly_label

This point feature class is used as an aid in building polygons when digitizing and represents the geologic unit that a polygon that contains the point should be attributed with. This feature class is similar to the labels in an ArcInfo coverage. A topology rule requires that a Lith_poly polygon contain a Lith_poly_label point. When polygons are built from their bounding lines, the GeoID of the point can be used to attribute the newly created polygon feature and to retain attributes when polygon topology needs to be rebuilt.

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 [null] TRUE 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 [null] TRUE unspecified, certain, probable, uncertain

confidence regarding feature level ID
LthIDbasis LithIDbasis 50 String CVD [null] TRUE exposed, float, etc.
see: LithIDbasis		 Basis for identification of lithologic unit.
General_ID Generalized_ID 16 String variable [null] TRUE Qsf

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 unit in area of polygon (feature level)  

Feature Class: Subcrop_poly

This feature class represents geologic units under alluvial cover or other cover (where known). The polygons are built from concealed_contacts, contacts, and faults. Without significant effort, it is quite likely that there will not be complete subcrop coverage of the map area.

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 TRUE 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
LthIDbasis LithIDbasis 50 String CVD exposed TRUE well, seismic, etc.
see: LithIDbasis		 Basis for identification of lithologic unit.
General_ID Generalized_ID 16 String variable [null] TRUE Qsf

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 unit in area of polygon (feature level)