COUNTY WELL INDEX (CWI) -
GEOLOGICAL DESCRIPTIONS
Field |
Description |
Main ID Information |
Metadata Updated 2007 |
Title |
Nicollet County Aggregate Evaluation -CWI Geological Descriptions Table |
Filename |
Cwi_geod (DataBase File) |
Abstract |
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. |
Place Keywords |
Nicollet County, Minnesota |
Theme Keywords |
CWI, County Well Index, Geological Descriptions |
Time Period of Content |
Downloaded in 1999 |
Parent Theme |
NA |
Spatial Extent of the Data |
Nicollet County, Minnesota |
Contact Person |
Aggregate Resource Mapping
Program (Geologist or GIS Specialist) St. Paul, MN 55155-4045 |
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 Nicollet 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 |
1999 |
Maintenance Frequency |
None planned |
Access Constraints |
NA |
Use Constraints |
NA |
Associated Data Sets |
CWI99PT3 - one-to-many (cwi99pt3-to-cwi_geod) - relate on unique_no. |
Data Quality |
|
Attribute Accuracy |
These descriptions were made by several different drillers, geologists, etc. The information within them ranges from very good to very poor. The thicknesses 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 other 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 |
These descriptions were made by several different drillers, geologists, etc. The information within them ranges from very good to very poor. The thicknesses 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. |
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 Nicollet 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 |
374 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 |
cwi_geod.dbf |
Unique_no |
|
Text, 6 |
Ex: 102365 |
This is the unique well identifier used by the MGS to reference the well (Relate item with cwi99pt3). |
|
Dpth_topi |
|
Number,11,0 |
Ex: 2, 4, 8, 240 |
Depth to the top of interval. |
|
Drill_desc |
|
Text, 33 |
Ex: Clay, Sand , Gravel |
Drillers log - geological description |