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.