# Redwood County, Minnesota - Aggregate Resources Geologic Field Observations

This page last updated: 10/02/2022
Metadata created using Minnesota Geographic Metadata Guidelines

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1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

## Section 1: Overview

Originator: Minnesota Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Evaluation Section
Title: Redwood County, Minnesota - Aggregate Resources Geologic Field Observations
Abstract: This dataset includes information gathered in the field. Fieldwork was completed in the summer and fall of 2021. It includes 109 field observation sites within Redwood County, Minnesota. Observations include, but are not limited to gravel pits, exposures of surficial geologic sediment, and glacial stratigraphy in road cuts or along stream banks, excavations for construction projects and trenches (cable, pipe, and tiling), and test holes drilled with a Giddings Soil probe. This spatial dataset contains a field description of each site, the dominant type of material encountered, the source of information, geologic unit thickness, and geologic overburden thickness.
Purpose: To summarize the field observations collected in Redwood County, Minnesota. These field observations were made to confirm air photo interpretation that identified potential aggregate bearing landforms.
Time Period of Content Date: 10/02/2022
Currentness Reference: Data were collected intermittently in the summer and fall of 2021.
Progress: Complete
Maintenance and Update Frequency: None Planned
Spatial Extent of Data: Redwood County, Minnesota
Bounding Coordinates: -94.86
-95.62
44.71
44.19
Place Keywords:
Theme Keywords:
Theme Keyword Thesaurus: Field observations, aggregate resources, surficial geology.
Access Constraints:
Use Constraints: Acknowledgement of the Minnesota Department of Natural Resources is appreciated for products derived from these data.
Contact Person Information: ,
,
Phone:
Email:
Browse Graphic: None available
Associated Data Sets:

## Section 2: Data Quality

Attribute Accuracy:
Logical Consistency:
Completeness: The data points were gathered at the location where field observations took place. Additional information is given in the Lineage section.
Horizontal Positional Accuracy: The differential correction of the GPS unit for GPS located sites is +/- 2 meters
Vertical Positional Accuracy: Not applicable.
Lineage: A tablet, a GPS unit (Garmin inReach SE+), ArcGIS 10.6 software, and the GPS toolbar in ArcGIS 10.6 were used in the field to determine the track and location of the observer collecting the points. Field observation points were digitized in real time, as well as, the entered tabular attribute information. The combination of the GPS unit's location, USGS topographic maps (1:24,000), and aerial photographs (1:3,000 - 1:12,000) were used to assist in determining the observation's site location on screen. The GPS unit (with differential correction) is accurate to approximately a few meters.

## Section 3: Spatial Data Organization (not used in this metadata)

## Section 4: Coordinate System

Horizontal Coordinate Scheme: Universal Transverse Mercator
UTM Zone Number: 15
Horizontal Datum: NAD83
Horizontal Units: meters
Vertical Datum:
Vertical Units:
Depth Datum:
Depth Units:

## Section 5: Attributes

Overview: This dataset consists of field observation unique id, type of site, type of geologic material, description of the observation, unit thickness, and overburden thickness.
Detailed Citation:
Table Detail:

fobs_redwood
Field Name | Valid Values | Definition | Definition Source
--- | --- | --- | ---
FID | - | Internal feature number. | Esri
Shape | - | Feature geometry. | Esri
field_id | - |  |
sitetype_1 | enumerated |  |
| Drill hole | Test hole drilled with a Giddings Soil probe. |
| Excavation | Usually due to human activity, such as digging of building, trenches, construction areas, or containment ponds. |
| Exposure | Outcrop of material from erosional, biological processes, or construction processes. |
| Gravel Pit | Gravel pits exposing sand and gravel material. |
| Other | General miscellaneous field observations. |
| Outcrop | Bedrock exposure at the surface. |
sitetype_2 | enumerated |  |
| Animal Hole | A hole dug by an animal that exposes sediment. |
| Back Hoe | A hole or exposure of sediment created by a back hoe. |
| Construction | Mining or digging due to construction activity associated with building of houses, excavating, or roads. |
| Ditch | Materials exposed in a ditch due to a slump or landscaping that has removed vegetation. |
| Drainage | Materials exposed in a drainage ditch due to a slump or landscaping that has removed vegetation. |
| Drill Hole | Test hole drilled with a Giddings Soil probe. |
| Field | Materials exposed in a field. |
| Power Pole | A hole or materials exposed from the installation of a power pole. |
| Hillside | Materials exposed in a hillside. |
| Outcrop | Bedrock exposed at the surface. |
| Road Cut | Materials exposed in a road cut. |
material_1 | enumerated |  |
|  | Refers to rocks with a diameter >10 inches. |
| Clay | Very fine-grained sediment that is less than 0.004 mm in size. |
| Did Not Observe | Indicates that observations were not possible, likely due to vegetation cover. |
| Fine Sand | Rocks and minerals that range in diameter of 0.0625 to 0.25 mm. |
| Sand | Sand is composed of rocks and minerals that range in diameter from 0.0625 to 2 mm. |
| Sand minor Gravel | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 5-15% by volume. |
| Sand with Gravel | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 15-35% by volume. |
| Sand and Gravel | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 35-50% by volume. |
| Gravel and Sand | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 50-65% by volume. |
| Silty Sand and Gravel |  |
| Silty Sand | Sand that contains some silt. |
| Gravel with Sand | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 65-85% by volume. |
| Silt |  |
| Rocky Soil | Soil that contains a high percentage of rock fragments |
| Cobbles | Rock fragments that have a diameter between 3-10 inches. |
| Topsoil | Soil that contains organic matter. |
material_2 | enumerated |  |
| Boulders | Refers to rocks with a diameter >10 inches. |
| Clay | Very fine-grained sediment that is less than 0.004 mm in size. |
| Cobbles | Rocks with a diameter between 3-10 inches. |
| Fine Sand | Rocks and minerals that range in diameter of 0.0625 to 0.25 mm. |
| Sand | Sand is composed of rocks and minerals that range in diameter from 0.0625 to 2 mm. |
| Sand minor Gravel | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 5-15% by volume. |
| Sand with Gravel | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 15-35% by volume. |
| Sand and Gravel | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 35-50% by volume. |
| Gravel and Sand | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 50-65% by volume. |
| Silty Sand and Gravel |  |
| Topsoil | Soil that contains organic matter. |
| Silt |  |
| Gravel with Sand | Sediment that contains a mixture of rocks in varying sizes ranging from 0.0625 to 64 mm. This description is given to sediment that contains an approximate estimate of gravel between 65-85% by volume. |
| Silty Sand | Sand that contains some silt. |
| Sandy Till | Till that contains a high percentage of sand. |
fielddesc | - | A short field description of the observation site. |
thickness | - | The thickness of the deposit expressed in combination with a modifier. Not Available (NA) indicates that the measurement does not apply or was not observed. |
thick_val | - | Gives the minimum value for thickness. (-999 is a null value) |
overburden | - | Expresses overburden thickness by possibly using one or both the modifier and value. Not Available (NA) indicates that the measurement does not apply or was not observed. |
ob_mod | - | Modifiers to express numeric approximations observed for deposit thickness: > greater than; < less than |
ob_val | - | Gives the value for overburden thickness. (-999 is a null value). |

## Section 6: Distribution

Publisher: Minnesota Department of Natural Resources (DNR)
Publication Date: 10/02/2022
Contact Person Information: ,
,
Phone:
Email:
Distributor's Data Set Identifier: Redwood County Aggregate Resources, Sand and Gravel Potential
Distribution Liability: The State of Minnesota makes no representations or warranties express or implied, with respect to the use of the information contained herein regardless of its format or the means of its transmission. There is no guarantee or representation to the user as to the accuracy, currency, suitability, completeness, usefulness, or reliability of this information for any purpose. The user accepts the information “as is." The State of Minnesota assumes no responsibility for loss or damage incurred as a result of any user’s reliance on this information. All maps, reports, data, and other information contained herein are protected by copyright. Permission is granted to copy and use the materials herein for any lawful noncommercial purpose. Any user of this information agrees not to transmit or provide access to all or any part of this information to another party unless the user shall include with the information a copy of this disclaimer.
Ordering Instructions: Redwood County’s aggregate resource spatial datasets (shapefiles & file geodatabase) are included in the file redwooddata.zip, accessible from the MN DNR Aggregate Mapping web page: http://www.dnr.state.mn.us/lands_minerals/aggregate_maps/completed/index.html
The spatial datasets include sand and gravel resource potential, geologic field observations, aggregate pits, Minnesota Geological Survey (MGS) County Well Index (CWI) data points, MnDOT Aggregate Source Information System (ASIS) points, and MnDOT ASIS pit quality table.
Online Linkage: I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.

## Section 7: Metadata Reference

Metadata Date: 10/02/2022
Contact Person Information: ,
,
Phone:
Email:
Metadata Standard Name: Minnesota Geographic Metadata Guidelines
Metadata Standard Version: 1.2
Metadata Standard Online Linkage: http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm

This page last updated: 10/02/2022
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