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This page last updated: 04/06/2007
Metadata created using Minnesota Geographic Metadata Guidelines
| Originator | Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Section |
| Abstract | This dataset consists of information about the geology, geological characteristics, and aggregate potential of 165 map units. Five fields relate to the surficial geology of the map unit. Twelve fields relate to the sand and gravel characteristics, including probability, quality, texture, overburden thickness, and deposit size, of the map unit. Eleven fields relate to crushed stone characteristics, including probability, quality, overburden thickness, and deposit size, of the map unit. These characteristics were used to calculate the aggregate potential of the map unit for both crushed stone and sand and gravel. |
| Browse Graphic | View a sample of the data. |
| Time Period of Content Date | 2001 |
| Currentness Reference | All data was gathered in the late fall of 2000 and the summer and fall of 2001 and compiled in the Fall of 2001 through the spring of 2002. |
| Access Constraints | NA |
| Use Constraints | Acknowledgement of the MN DNR is appreciated in products derived from these data. |
| Distributor Organization | Minnesota Department of Natural Resources, Division of Lands and Minerals |
| Ordering Instructions | This and other aggregate resource data layers for Benton County are available for download in a zipfile, bentdata.zip, accessible from the MN DNR, Lands and Minerals, Aggregate Mapping web site: http://www.dnr.state.mn.us/lands_minerals/aggregatemaps.html Maps formatted as .pdf files can be downloaded from the same site: Plate 1: Significant Aggregate Resource Deposits (benton_plate1.pdf), Plate 2: Aggregate Resources (benton_plate2.pdf), Plate 3: Surficial Geology (benton_plate3.pdf), and Plate 4: Data Sources and Mapping Methodologies (benton_plate4.pdf). Note: the web page also indicates which other counties have been mapped. |
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata. |
Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information
| Section 1 | Identification Information | Top of page | ||
| Originator | Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Section | |||
| Title | Benton County Aggregate Resource Evaluation - Aggregate Potential and Surficial Geology | |||
| Abstract | This dataset consists of information about the geology, geological characteristics, and aggregate potential of 165 map units. Five fields relate to the surficial geology of the map unit. Twelve fields relate to the sand and gravel characteristics, including probability, quality, texture, overburden thickness, and deposit size, of the map unit. Eleven fields relate to crushed stone characteristics, including probability, quality, overburden thickness, and deposit size, of the map unit. These characteristics were used to calculate the aggregate potential of the map unit for both crushed stone and sand and gravel. | |||
| Purpose | To summarize the geological characteristics, surficial geology, and aggregate potential (sand, gravel, and crushed stone) of the different units. To help categorize the geological characteristics and incorporate them into a model to help determine the aggregate potential of the deposit. | |||
| Time Period of Content Date | 2001 | |||
| Currentness Reference | All data was gathered in the late fall of 2000 and the summer and fall of 2001 and compiled in the Fall of 2001 through the spring of 2002. | |||
| Progress | Complete | |||
| Maintenance and Update Frequency | None planned | |||
| Spatial Extent of Data | Benton County, Minnesota | |||
| Bounding Coordinates | -94.35 -93.76 45.83 45.55 |
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| Place Keywords | Benton County, Minnesota | |||
| Theme Keywords | geoscientificInformation, Surficial geology, geological characteristics, aggregate potential, sand, gravel, crushed stone | |||
| Theme Keyword Thesaurus | ISO 19115 Topic Category | |||
| Access Constraints | NA | |||
| Use Constraints | Acknowledgement of the MN DNR is appreciated in products derived from these data. | |||
| Contact Person Information | Jon Ellingson (or Renee Johnson),
Industrial Minerals Geologist (or GIS Specialist) Minnesota Department of Natural Resources, Division of Lands and Minerals 2300 Silver Creek Road NE, Box 27 Rochester, MN 55906 Phone: 507-280-5590 FAX: E-mail: jon.ellingson@dnr.state.mn.us | |||
| Browse Graphic | View a sample of the data. | |||
| Browse Graphic File Description | ||||
| Associated Data Sets | The County Aggregate Mapping Program dataset for Benton County is included in the file bentdata.zip, accessible from the MN DNR Aggregate Mapping web page: http://www.dnr.state.mn.us/lands_minerals/aggregatemaps.html |
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| Section 2 | Data Quality Information | Top of full metadata | Top of page | |
| Attribute Accuracy | The sand and gravel and surficial geology units were delineated by the interpretation of aerial photographs at a 1:40,000 scale. These interpretations were plotted on 1:24,000 USGS topographic maps. These delineations and unit descriptions were field checked and revised. The final coverage was digitized on-screen using Digital Orthographic Quads (DOQ 1:12,000 Scale). This was a reconnaissance scale study and was mapped at 1:50,000. The crushed stone units were delineated based on a model used to define a depth to bedrock surface (see the Lineage section below for more information. | |||
| Logical Consistency | Overshoots and undershoots were fixed by a variety of techniques, thus the lines have been checked and completed. | |||
| Completeness | The sand and gravel resource units were delineated by aerial photograph interpretations. The potential of the deposit is based on geological factors and not economical factors. Generalizations were made, this is a reconnaissance-scale study (1:50,000). The crushed stone resource units were delineated by creating a model of the depth to bedrock (1:100,000). | |||
| Horizontal Positional Accuracy | 1:50000 for sand and gravel, 1:100,000 for crushed stone | |||
| Vertical Positional Accuracy | Not applicable. | |||
| Lineage | The first step in determining the distribution of aggregate resources is to understand the surficial geology and the recent geological history of the area. The geological history basically tells us the story, or sequence of events, of when the aggregate and other sediments were deposited. By understanding this story we can determine where the aggregate was deposited, as well as some of the general characteristics about the material. This was accomplished for this study by completing an aerial photograph interpretation of the entire county and confirming these interpretations with approximately 1,000 water well logs and by observing approximately 1,325 field sites. Several other data sets and techniques were also used and are described below. These interpretations and observations were then compiled to form a sequence of events to tell the geologic story. Finally, the aggregate bearing landforms were delineated and categorized based on their geological characteristics.For sand and gravel:Color infrared and black-and-white aerial photographs were used to delineate geological landforms and aggregate resources. Stereoscopic pairs of color infrared aerial photographs (NAPP, 9x9 at 1:40,000 scale, April 1991 and 1992) were used along with reconnaissance-level, high-altitude, black-and-white photographs (1:80,000 scale). Aerial photographs (DOQs) were also available digitally and used within ARCVIEW (1:12,000 scale). Aerial photographic interpretation was completed with a glacial mapping technique known as the landsystems approach. This technique relies on the principle that depositional glacial landforms are composed of a predictable range of sediments, some consisting of sorted sand and gravel and others consisting of silts, clays, or unsorted materials. In addition to the landsystems approach, several other general characteristics helped determine the nature of the material, such as tonal contrasts, texture, context, shape, size, trend, association, and patterns. These characteristics can help determine the properties of the surface material (e.g., certain vegetation grows on well drained soils such as sand and gravel, which on an aerial photograph has a distinctive texture, tone, pattern, etc.).The landform recognition approach (part of the landsystems approach) was also used when interpreting the topography within Benton County; glacial landforms have distinct and unique shapes and patterns that can be observed in their topographic expression. Topographic maps (USGS 1:24,000), digital elevation models, and shaded relief maps were all used to help delineate these sand and gravel bearing features. The topographic expression of a feature can also be observed by looking at the distribution of lakes and wetlands. For example, a string of lakes and/or wetlands may be the signature of a glacial outwash channel or collapsed channel, which may host sand or gravel deposits. Several aggregate bearing features were located using this technique (outwash channels, collapsed channels, glaciofluvial fans, eskers, and terraces). For crushed stone:A model was developed using Arcview and its Spatial Analyst extension to determine the depth to bedrock. The data incorporated into the model included well locations with well log information indicating a depth to bedrock; outcrops from the soil information; outcrops observed in the field; and surface elevations, stored as digital elevation model (30-meter DEM data from USGS). To calculate the depth to bedrock in relation to the surface elevation, the point locations for depth to bedrock and outcrops (i.e., the depth to bedrock equals 0 for outcrops) were subtracted from the surface elevations. A top of bedrock surface for the county was then created by interpolating these points. These top of bedrock values were then subtracted from the surface elevations, resulting in an approximate depth to crushed stone resource values for the county. |
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| Source Scale Denominator | 50000 | |||
| Section 3 | Spatial Data Organization Information | Top of full metadata | Top of page | |
| Native Data Set Environment | Arc/INFO 8.0.2, and Arcview 3.1 from ESRI | |||
| Geographic Reference for Tabular Data | ||||
| Spatial Object Type | Vector | |||
| Vendor Specific Object Types | Polygon | |||
| Tiling Scheme | Benton County | |||
| Section 4 | Spatial Reference Information | Top of full metadata | Top of page | |
| Horizontal Coordinate Scheme | UTM | |||
| Ellipsoid | GRS80 | |||
| Horizontal Datum | NAD83 | |||
| Horizontal Units | Meters | |||
| Distance Resolution | ||||
| Altitude Datum | Not applicable | |||
| Depth Datum | Not applicable | |||
| UTM Zone Number | 15E | |||
| Section 5 | Entity and Attribute Information | Top of full metadata | Top of page | |
| Entity and Attribute Overview | The polygons were delineated to represent geological features, geological characteristics, and aggregate potential for sand and gravel and for crushed stone. | |||
| Entity and Attribute Detailed Citation | ftp://ftp.lmic.state.mn.us/pub/dnr/attributes/agp02py3_att.htm | |||
| Section 6 | Distribution Information | Top of full metadata | Top of page | |
| Publisher | Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Section | |||
| Publication Date | 2002 | |||
| Contact Person Information | Jon Ellingson Industrial Minerals Geologist Minnesota Department of Natural Resources, Division of Lands and Minerals 2300 Silver Creek Road NE, Box 27 Rochester, MN 55906 Phone: 507-280-5590 FAX: E-mail: jon.ellingson@dnr.state.mn.us |
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| Distributor's Data Set Identifier | Downloadable Data | |||
| Distribution Liability | The Minnesota Department of Natural Resources makes no representation or warranties, express or implied, with respect to the reuse of data provided herewith, 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, or reliability of this data for any purpose. The user accepts the data 'as is', and assumes all risks associated with its use. By accepting this data, the user agrees not to transmit this data or provide access to it or any part of it to another party unless the user shall include with the data a copy of this disclaimer. The Minnesota Department of Natural Resources assumes no responsibility for actual or consequential damage incurred as a result of any user's reliance on this data. | |||
| Transfer Format Name | ||||
| Transfer Format Version Number | ||||
| Transfer Size | 1.8 mb for data, 15.5 mb for associated maps | |||
| Ordering Instructions | This and other aggregate resource data layers for Benton County are available for download in a zipfile, bentdata.zip, accessible from the MN DNR, Lands and Minerals, Aggregate Mapping web site: http://www.dnr.state.mn.us/lands_minerals/aggregatemaps.html Maps formatted as .pdf files can be downloaded from the same site: Plate 1: Significant Aggregate Resource Deposits (benton_plate1.pdf), Plate 2: Aggregate Resources (benton_plate2.pdf), Plate 3: Surficial Geology (benton_plate3.pdf), and Plate 4: Data Sources and Mapping Methodologies (benton_plate4.pdf). Note: the web page also indicates which other counties have been mapped. |
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| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above. | |||
| Section 7 | Metadata Reference Information | Top of full metadata | Top of page | |
| Metadata Date | 04/06/2007 | |||
| Contact Person Information | Jon Ellingson,
Industrial Minerals Geologist Minnesota Department of Natural Resources, Division of Lands and Minerals 2300 Silver Creek Road NE, Box 27 Rochester, MN 55906 Phone: 507-280-5590 FAX: 507-285-7144 E-mail: jon.ellingson@dnr.state.mn.us |
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| Metadata Standard Name | Minnesota Geographic Metadata Guidelines | |||
| Metadata Standard Version | 1.2 | |||
| Metadata Standard Online Linkage | http://www.lmic.state.mn.us/gc/stds/metadata.htm | |||
This page last updated: 04/06/2007