Dataset contains the structure lines, including structure contours, erosional surface contours, and anticlinal and synclinal axes.  This coverage also contains datum change boundaries.  Important:  **this layer does not contain faults**

Summary
This dataset includes geologic stuctural contours of varying datums across Kentucky in shapefile format. These structural contours are compiled from structural contour layers published as a part of the individual Digitally Vectorized Geologic Quadrangles (DVGQ) datasets (by the Kentucky Geologic Survey. See the Data Origin Citations.txt file and Data Authors.txt for citations of these individual datasets and the individual authors.

Description
This dataset includes geologic stuctural contours of varying datums across Kentucky in shapefile format. These structural contours are compiled from structural contour layers published as a part of the individual Digitally Vectorized Geologic Quadrangles (DVGQ) datasets (by the Kentucky Geologic Survey: https://kgs.uky.edu/kygeode/services/pubs/?pubtype=DVGQ&searchtype=pubcategory). The original structural contours were mapped on the 7.5-minute (1:24,000 scale) series geologic maps published during the Kentucky geologic mapping program (Kentucky Geological Survey - U.S. Geological Survey from 1960 to 1989: https://kgs.uky.edu/kygeode/services/pubs/?pubtype=GQ&searchtype=pubcategory). The digital contours were subsequently digitized as a part of the DVGQ datasets during the geologic digital mapping program at KGS (1996 – 2007). Contoured formations were determined by the original quadrangle map author, therefore contour datum may vary across quadrangle boundaries. These structural contours are not based on subsequently obtained subsurface data and should only be used as a general guideline for the underlying geologic structure.  Contours are in feet above sea level, and may vary in contour interval across quadrangle boundaries. Please note that some contours are projected above the land surface. Refer to the metadata and supporting information for detail about the data fields and data attributes.

Author: Kentucky Geological Survey

Field Names and Descriptions:
- FID: assigned object ID. Values start at 0, and no gap in numbering.
- Shape: type of shapefile shape (Polyline)
- Type: type of structure line. Possible values are:
o Contour: contour of a datum (most lines are contours)
o Boundary: boundary between datums
o Axis: fold axis
o Outline: outline of structure of different types
- Datum: Datum for line (in most cases for the contour). In many cases this is the KGS assigned formation code. See the StructName for a more detailed description on the datum.
- Reference: describes from where the datum was derived, e.g.: base of bed (BASE), top of bed (BED), erosional surface, etc…
- StructName: more detailed description of the datum or structure.
- Value: for Contour, the elevation in feet.
- GQNUM: USGS assigned 7.5-minute geologic quadrangle number where the line was originally mapped.
- GQName: USGS assigned geologic quadrangle name of the GQNUM.
- Quad100K: USGS 1:100,000-scale map where the line was originally mapped.
- County: Kentucky county where the line resides.
- Length: length of line in feet.

Spatial Reference:
Type: Projected
Geographic coordinate reference: GCS_North_American_1983
Projection: NAD_1983_StatePlane_Kentucky_FIPS_1600_Feet
WKID?102763
WKT?PROJCS["NAD_1983_StatePlane_Kentucky_FIPS_1600_Feet",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",4921250.0],PARAMETER["False_Northing",3280833.333333333],PARAMETER["Central_Meridian",-85.75],PARAMETER["Standard_Parallel_1",37.08333333333334],PARAMETER["Standard_Parallel_2",38.66666666666666],PARAMETER["Latitude_Of_Origin",36.33333333333334],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",3089]]
