AGGREGATE RESOURCE POTENTIAL

WRIGHT COUNTY, MINNESOTA

Field | Description
Main ID Information | Metadata Updated 2007
Title | Aggregate Resources and Quaternary Geology of Wright County, Minnesota. This layer is part of Minnesota Department of Natural Resources, Minerals Division Report 294, from 1991.
Filename | ahapefiles: sg90xpy3, sg90xln3, and sym90ln3 Access97 database: wrigapot.mdb
Abstract | This dataset consists of information about surficial geology and aggregate resource potential, based on geological factors. This work is authorized by Minnesota Statute 84.94.
Place Keywords | Wright County, MN
Theme Keywords | Aggregate resource potential, geological characteristics
Time Period of Content | 1988-1989
Parent Theme |
Spatial Extent of the Data | Wright County, Minnesota
Contact Person | Aggregate Resource Mapping Program (Geologist or GIS Specialist) Minnesota Department of Natural Resources, Division of Lands and Minerals 500 Lafayette Road, Box 45 St. Paul, MN 55155-4045 Phone: 651-259-5959 FAX: 651-296-5939 E-mail: AggregateMap@dnr.state.mn.us
Contact Person Organization/Division | Minnesota Department of Natural Resources, Division of Lands and Minerals
Contact Person Position | Geologist or GIS Specialist
Contact Address | 500 Lafayette Road
Contact City | St. Paul, MN
Contact Zip Code | 55155-4045
Contact Voice Phone | 651-259-5959
Contact Fax Phone | 651-296-5939
Additional ID Information |
Originator | Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Section.
Purpose | To summarize the aggregate resource potential of the various mapping units.
Progress | Complete
Currentness Reference | Air photo interpretation 1988-1989, field work summers of 1988 and 1989.
Maintenance Frequency | None planned
Access Constraints | NA
Use Constraints | NA
Associated Data Sets | shapefile: gp90xpt3 Note: the following two maps are available in pdf format: Aggregate Resources (i.e., wrigapot.pdf) and Aggregate Resources and Quaternary Geology (i.e., wrigqgeo.pdf)
Data Quality |
Attribute Accuracy | The mapping units were compiled onto 1:24,000 USGS topographic maps. These delineations and unit descriptions were field checked and revised. The coverage was created by digitizing the delineations after registering the USGS maps on a digitizing table.
Logical Consistency | NA
Completeness | The units were delineated by aerial photograph interpretations. The potential of deposits is based on geologic factors, not economic factors. Generalizations were made, resulting in a product that should be considered reconnaissance level and accurate to a scale of 1:70,000.
Horizontal Positional Accuracy | 1:70,000
Vertical Positional Accuracy | NA
Lineage | These coverages are part of Minnesota Department of Natural Resources, Minerals Division Report 294, Aggregate Resources and Quaternary Geology, 1991, by JD Lehr. The data were compiled in a multi-step process. The first step developed a preliminary Quaternary geology legend after a review of the literature of glacial geology in central Minnesota. The map units were based on the principle that glacial depositional environments can be mapped based upon their landform expression. Additional map units were included to provide detail within potential aggregate units. Next, subsurface data were added to the compilation maps to supplement the geologic inferences, including well logs, stored in a database at the Minnesota Geologic Survey entitled County Well Index (i.e., CWI); Minnesota Department of Transportation gravel pit sheets, including shallow (10-40') test-hole logs, sieve, and quality test data; and Minnesota Department of Transportation bridge-boring logs. Gravel pit locations were also added to the compilation maps and were gathered from a number of sources, including the Soil Survey of Wright County (from the Soil Conservation Service), 15-minute USGS topographic maps, Minnesota Department of Transportation Wright County Highway Map, Wright County Highway Department files, and field observations by the author, JD Lehr. At this point, mapping units were delineated on 1:24000 USGS topographic maps using stereographic photo pairs at a scale of 1:80000 or 1:90000. During the summers of 1988 and 1989, the author made observations of the landform expression and surficial sediment, as exposed in gravel pits, road cuts, natural exposures, and excavations. Where exposures were lacking, sediment from shallow, hand-augured holes were described. After the field work, the compilation maps were reexamined in relation to the air photos, scholarly review, the plotted subsurface data, and the Soil Survey of Wright County, and adjustments were made to the mapping units as necessary.
Source Scale Denominator | 1:62,500
Spatial Reference |
Horizontal Coordinate Scheme | UTM
Ellipsoid | GRS80
Horizontal Datum | NAD83
Horizontal Units | Meters
Distance Resolution | NA
Altitude Datum | NA
Altitude Units | NA
Depth Datum | NA
Depth Units | NA
UTM Zone Number | 15, extended
Raster only |
Cell Width | NA
Cell Height | NA
Spatial Data Organization |
Geographic Reference for Tabular Data | NA
Native Dataset Environment | ArcView 3.1 / Arc/INFO 7.2.1
Vendor Specific Object Type | NA
Tiling Scheme | County
Spatial Object Type | Vector-polygon
Transfer Size |
Entities -- Attributes |
Entity-Attribute Overview | Quaternary geology mapping units, aggregate resource potential units based on geological factors
Entity-Attribute Detailed Citation | The basic relationships among the attributes are as follows: Geo_unit Geo_label Geo_age Deposit Aggregate Mantle ----------------------------------------------------------------------------------------------------------------- 1 O Holocene Organic 2 Al Holocene Alluvium 3 Alf Holocene Alluvium - fine facies 4 Alc Holocene Alluvium - coarse facies 10 Dot Des Moines Terrace outwash Y 11 Do Des Moines Outwash Y 12 Doc Des Moines Collapsed outwash Y 13 Di Des Moines Ice-contact deposits Y 15 Dt Des Moines Till and supraglacial sediment 17 Dotl Des Moines Lower terrace outwash Y 18 Dotu Des Moines Upper terrace outwash Y 19 Sim Superior Ice-contact sand and gravel Y M 89 W Water (River) 99 W Water (Lake)

Table Name | Field Name | Begin Column | Definition | Valid Values | Descriptions
sg90xpy3 shapefile |  |  |  |  | Quaternary geology polygons
| geo_unit |  | Number,2,0 | 1, 2,3,4, 10,11,12, 13, 15, 17,18, 19, 89,99 | Quaternary (i.e., surficial) geology units, given as a number
| geo_label |  | Text,4 | O, Al,Alf,Alc, Dot,Do,Doc, Di, Dt, Dotl,Dotu, Sim, W,W | Quaternary (i.e., surficial) geology units, given as a character string (presented in the same order as above, for geo_unit)
| geo_age |  | Text,10 | Holocene, Des Moines Lobe, Superior Lobe | Age of material in the mapping unit
| deposit |  | Text,40 | e.g., Organic, Alluvium, Outwash, Ice-Contact Deposits, Till and supraglacial sediment, Water | Type of deposit. Refer to the "Entity-Attribute Detailed Citation" listed prior to this table for the relationships among the various attributes.
| aggregate |  | Text,1 |  | Flagged with a Y if the mapping unit has aggregate resource potential; flagged with an N if it does not.
|  |  |  | Y | Those geologic units that are inferred to contain potentially significant aggregate deposits. Gravel pits and aggregate sources (from gp90xpt3) indicate identified resources.
|  |  |  | N | Those geologic units that generally have little or no potential for aggregate resources. In places, includes aggregate deposits either too small or too difficult to map.
| mantle |  | Text,1 | M=mantled | The mapping unit is mantled by another mapping unit
sg90xln3 shapefile |  |  |  |  | Quaternary geology polygon boundaries, stored as an arc coverage
| contact |  | Number,2,0 | 10,60,69,70,79,89 | Polygon boundary, given as a number
| cont_type |  | Text,70 | County boundary; Geologic contact; Geologic contact coincident with lake boundary; Geologic contact - inferred, gradational, or approximately located; Geologic contact - inferred, gradational, or approximately located, coincident with lake boundary; Geologic contact coincident with river boundary | Polygon boundary, given as a text description (presented in the same order as above, for contact)
sym90ln3 - associated geology line shapefile |  |  |  |  | Geologic landforms, stored as lines
| landform |  | Number,1,0 | 1,2,3,4,5 | Type of landform, stored as a number
| descrip |  | Text,70 | Buried tunnel valley margin, Inferred tunnel valley esker, Possible Grantsburg sublobe ice-marginal position, Buried tunnel valley margin - inferred or approximated located; in many cases these lines extend through high ground, Possible Superior lobe ice-marginal position. | Description of the landform type (presented in the same order as above, for landform)
wrigapot.mdb - Access97 database |  |  |  |  | Several associated tables of legend descriptions used on the maps.
aggpot90 table |  |  |  |  | Legend descriptions for the mapping units with or with little aggregate resource potential. Relate to sg90xpy3 shapefile on Aggregate field.
| aggregate |  | Text,1 | Y or N | Y indicates the mapping unit has aggregate resource potential; N indicates the mapping unit has little or no potential for aggregate resources.
| agg_desc |  | Text,200 | Those geologic units that are inferred to contain potentially significant aggregate deposits.... Those geologic units that generally have little or no potential for aggregate resources... | The legend descriptions for units with or with little aggregate potential.
qg90xleg table |  |  |  |  | Legend descriptions for the surficial geology mapping units. Relate to sg90xpy3 shapefile on geo_unit field.
| geo_unit |  | Integer | 1, 2,3,4, 10,11,12, 13, 15, 17,18, 19, 89,99 | Quaternary (i.e., surficial) geology units, given as a number
| num_lines |  | Integer | 1 to 5 | Number of lines of text comprising the legend description
| qgeo_line1 |  | Text,130 | e.g., Peat and organic-rich silt and clay, ranging from... | First line of description.
| qgeo_line2 |  | Text,130 | e.g., immediately adjacent unit(s). In places, ... | Second line of description if num_lines >= 2.
| qgeo_line3 |  | Text,130 | e.g., till and supraglacial sediment, 5 to 10 feet thick, ... | Third line of description, used if num_lines >= 3.
| qgeo_line4 |  | Text,130 | e.g., collapsed outwash plains. Broadly ... | Fourth line of description, used if num_lines >= 4.
| qgeo_line5 |  | Text,130 | e.g., variable relief. | Fifth line of description, used if num_lines = 5.