COUNTY WELL INDEX (CWI) - GEOLOGICAL DESCRIPTIONS

DODGE COUNTY, MINNESOTA

Field | Description
# Main ID Information | Metadata Updated 2007
Title | Dodge County Aggregate Evaluation -CWI Geological Descriptions Table
Filename | Cwistrat (DataBase File)
Abstract | This dataset consists of a subset of the geological description attributes listed within the CWI database from the Minnesota Geological Survey. It lists the unique identifier, the depth to the top of interval and the driller’s description of the material encountered.
Place Keywords | Dodge County, Minnesota
Theme Keywords | CWI, County Well Index, Geological Descriptions
Time Period of Content | Downloaded in 2000
Parent Theme | NA
Spatial Extent of the Data | Dodge County, Minnesota
Contact Person | Aggregate Resources Mapping Program
Contact Person Organization/Division | Department of Natural Resources, Division of Lands and Minerals
Contact Person Position | Geologist or GIS Specialist
Contact Address | 500 Lafayette Road, Box 45
Contact City | St. Paul
Contact Zip Code | 55155-4045
Contact Voice Phone | 651-259-5959
Contact Fax Phone | 651-296-5939
Additional ID Information |
Originator | Minnesota Geological Survey
Purpose | This data set was used to help interpret the aggregate resources, surficial geology, and geological history of Dodge County. This dataset consists of the geological description used within the CWI database. It lists the unique identifier, the depth to the top of interval and the drillers description of the material encountered.
Progress | Complete
Currentness Reference | 2000
Maintenance Frequency | None planned
Access Constraints | NA
Use Constraints | NA
Associated Data Sets | Cwiwells - one-to-many (cwiwells-to-cwistrat) - relate on relateid.
Data Quality |
Attribute Accuracy | Descriptions were made by several different drillers and geologists. The information within them ranges from very good to very poor. The thickness are generally estimated to within a few feet and the descriptions may vary from hole to hole due to many different individuals completing the logging.
Logical Consistency | NA
Completeness | Some of the geological descriptions are very complete, while others are very vague. Ex: the detailed descriptions may be broken down every 5 to 10 feet describing the glacial material and bedrock formations; others may just say 0-240 glacial drift, 240-360 sandstone.
Horizontal Positional Accuracy | NA
Vertical Positional Accuracy | NA
Lineage | Descriptions were made by several different drillers and geologists. The information within them ranges from very good to very poor. The thickness is generally estimated to within a few feet and the descriptions may vary from hole to hole due to many different individuals completing the logging.
Source Scale Denominator | NA
Spatial Reference |
Horizontal Coordinate Scheme | NA
Ellipsoid | NA
Horizontal Datum | NA
Horizontal Units | NA
Distance Resolution | NA
Altitude Datum | NA
Altitude Units | NA
Depth Datum | Drilled and logged wells.
Depth Units | Feet
UTM Zone Number | NA
Raster only |
Cell Width | NA
Cell Height | NA
Spatial Data Organization |
Geographic Reference for Tabular Data | These points are located throughout Dodge County (usually near farms).
Native Dataset Environment | ArcView 3.1 / ArcInfo 8.0.2
Vendor Specific Object Type | NA
Tiling Scheme | County
Spatial Object Type | Point
Transfer Size | 268 kb
Entities -- Attributes |
Entity-Attribute Overview | This dataset consists of the geological description used within the CWI database. It lists the unique identifier, the depth to the top of interval, and the driller’s description of the material encountered.
Entity-Attribute Detailed Citation | See table below:

Table Name | Field Name | Begin Column | Definition | Valid Values | Descriptions
Cwistrat.dbf | Relateid |  | Text, 10 | Ex: 000101209 | This is the unique well identifier used by the MGS to reference the well (Relate item with cwistrat).
| Depth_top |  | Number, 6, 0 | Ex: 2, 4, 8, 240 | Depth to the top of interval in feet.
| Depth_bot |  | Number, 6, 0 | Ex: 2, 4, 8, 240 | Depth to the bottom of interval in feet.
| Drllr_desc |  | Text, 34 | Ex: Clay, Sand, Limestone | Material that drillers encountered while drilling the well.
| Color |  | Text, 8 | Ex: Yellow, Blue, Gray | Color of rock