AGGREGATE RESOURCE POTENTIAL

ISANTI COUNTY, MINNESOTA

Field | Description
Main ID Information | Metadata Updated 2007
Title | Aggregate Resources and Quaternary Geology of Isanti County, Minnesota. This layer is part of Minnesota Department of Natural Resources, Minerals Division, Report 304, from 1992.
Filename | sg92xpy3, sg92xln3, and sym92ln3
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 | Isanti County, MN
Theme Keywords | Aggregate resource potential, geological characteristics
Time Period of Content | 1990-1991
Parent Theme |
Spatial Extent of the Data | Isanti County, Minnesota
Contact Person | Aggregate Resources Mapping Program
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, Box 45
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 1990-1991, field work summers of 1990 and 1991.
Maintenance Frequency | None planned
Access Constraints | NA
Use Constraints | NA
Associated Data Sets | shapefiles: sg92xln3, sym92ln3, gp92apt3, gp92bpt3 Access database: isanapot.mdb
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 shapefiles are part of Minnesota Department of Natural Resources, Minerals Division, Report 304, Aggregate Resources and Quaternary Geology, 1992, 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 east-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 Geological Survey entitled County Well Index (i.e., CWI) and Minnesota Department of Transportation gravel pit sheets, including shallow (10-40') test-hole logs, sieve, and quality test data. Gravel pit locations were also added to the compilation maps and were gathered from a number of sources, including the Soil Survey of Isanti County (from the Soil Conservation Service), 15-minute USGS topographic maps, Minnesota Department of Transportation Isanti County Highway Map, Isanti County Highway Department, 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 1:90000. During the summers of 1990 and 1991, 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, and the plotted subsurface data, 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/township
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 Lobe Deposit Aggregate Mantle ------------------------------------------------------------------------------------------------------------------------- 10 O Organic 15 Al Alluvium 20 Dlc Grantsburg Lacustrine deposits - coarse 21 Dlf Grantsburg Lacustrine deposits - fine 23 Doc Grantsburg Collapsed outwash Y 24 Di Grantsburg Ice-contact stratified deposits Y 25 Docm Grantsburg Mantled collapsed outwash Y M 27 Dt Grantsburg Till 28 Dotl Grantsburg Lake-modified till 32 Som Superior Mantled outwash Y M 33 Soml Superior Mantled outwash Y ML 34 Si Superior Ice-contact stratified deposits Y 35 Sim Superior Mantled ice-contact stratified deposits Y M 36 Siml Superior Mantled ice-contact stratified deposits Y ML 37 St Superior Till 39 Stml Superior Mantled till ML 89 W Water (River) 99 W Water (Lake)

Table Name | Field Name | Begin Column | Definition | Valid Values | Descriptions
sg92xpy3 shapefile |  |  |  |  | Quaternary geology polygons
| geo_unit |  | Number,2,0 | 10,15, 20,21, 23,25,24, 27,28, 32,33, 34,35,36, 37,39, 89,99 | Quaternary (i.e., surficial) geology units, given as a number
| geo_label |  | Text,4 | O,Al, Dlc,Dlf, Doc,Docm,Di, Dt,Dtl, Som,Soml, Si,Sim,Siml, St,Stml, W,W | Quaternary (i.e., surficial) geology units, given as a character string (presented in the same order as above, for geo_unit)
| lobe |  | Text,10 | Superior, Grantsburg | Age of material in the mapping unit, based on lobe or sublobe
| deposit |  | Text,40 | e.g., Organic, Alluvium, Outwash, Ice-contact stratified deposits, Till, 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 a N if it does not.
|  |  |  | Y | Those geologic units that are inferred to contain potentially significant aggregate deposits. Gravel pits and aggregate sources (from gp92xpt3) 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,2 | M = mantled by another mapping unit, ML = mantled by Dlf (i.e., Lacustrine deposits - fine) unit | The mapping unit is mantled by another mapping unit
| major_lith |  | Text,30 | O-peat, Al-sand, Dlc-fine sand, Dlf-silt, Doc-sand and gravel, Docm-sand and gravel, Di-sand and gravel, Dt-till, Dtl-till, Som-sand and gravel, Soml-sand and gravel, Si-sand and gravel, Sim-sand and gravel, Siml-sand and gravel, St-till, Stml-till | Major lithology of mapping unit, presented here in relation to geo_label. That is, geo_label-major_lithology description
| minor_lith |  | Text,30 | O-organic-rich silt, Al-organic-rich silt, Dlc-silt, Dlf-clay, Di-silty sand, Dtl-silt, Som-silt, Soml-silt, Si-till, Sim-till, Siml-till | Minor lithology of mapping unit, presented here in relation to geo_label. That is, geo_label-minor_lithology description.
| mantl_lith |  | Text,35 | O-none, Al-none, Dlc-none, Dlf-none, Doc-none, Docm-undiff. Grantsburg sublobe deposits, Di-none, Dt-in places, fine sand, Dtl-in places, silt, Som-undiff. Grantsburg sublobe deposits, Soml-silt, Si-none, Sim-undiff. Grantsburg sublobe deposits, Siml-silt, St-none, Stml-silt | Lithology of the mantle unit found in this mapping unit, presented here in relation to geo_label. That is, geo_label-mantl_lithology description.
sg92xln3 shapefile |  |  |  |  | Quaternary geology polygon boundaries, stored as an arc coverage
| contact |  | Number,3,0 | 12,14,42,60,70,89,99,131 | Polygon boundary, given as a number, when layer digitized
| conttype |  | Text,70 | Meltwater channel; Meltwater channel; Ice-contact face; Geologic contact; Geologic contact - inferred, gradational, or approximately located; River boundary; Lake boundary; County boundary | Polygon boundary, given as a text description, when digitized (presented in the same order as above, for contact)
| cont4map |  | Number,3 | 60,60,60,60,70,99,99,131 | Polygon boundary, given as a number, used when mapped (given in same order as above, for contact)
| c4maptype |  | Text,70 | Geologic contact; Geologic contact; Geologic contact; Geologic contact; Geologic contact - inferred, gradational, or approximately located; Water boundary; Water boundary; County boundary | Polygon boundary, given as text, used when mapped (given in same order as above, for contact)
sym92ln3 - associated geology line shapefile |  |  |  |  | Geologic landforms, stored as lines
| landform |  | Number,2,0 | 11,13,20,30,41,60,70,75 | Type of landform, stored as a number
| lformtype |  | Text,30 | Meltwater channel (right side as look downstream), Meltwater channel (left side as look downstream), Meltwater flow direction, Crests of ridges (formed parallel to the margin of the Grantsburg sublobe), Ice-contact face, Esker (direction of line points in direction of meltwater flow), Drumlin (Long axis of Superior lobe drumlin, direction of line points in direction of ice flow), Drumlin - buried (Long axis of buried Superior lobe drumlin, direction of line points in direction of ice flow) | Description of the landform type (presented in the same order as above, for landform)