Plate B - MN DNR Report 375 Minnesota Department of Natural Resources Olmsted County Aggregate Resources Division of Lands and Minerals - Director Marty Vadis Crushed Stone Potential

a reconnaissance-level analysis (1:100,000), which offers an overview of the distribution of residential dwelling within the parcel. This method of locating wells is not as accurate as field checking crushed stone potential in Olmsted County. To determine the economic suitability of a crushed locations using 7.5 Minute USGS Quadrangle maps and/or a Global Positioning System (GPS), but is G O O D H U E C O R.15W. R.14W. W A B A S H A C O R.13W. AGGREGATE RESOURCES stone quarry site, additional site-specific information is required. Site-specific factors can acceptable for delineating reconnaissance-level crushed stone potential. Overburden thickness is estimated

0

1000 5 k ® o Hp 0 e r Hp 18 Mp Mp 1 include land ownership, the owner’s preference, environmental criteria, royalty rates, distance to using ESRI’s ArcGIS to develop a bedrock elevation model using 4,943 depth-to-bedrock data points. This

b Lp 63 e Ltd Lp m 1125 1000 r CRUSHED STONE POTENTIAL 3 Middl 1 u e 52 1 C 0 market, permitting requirements, and/or cultural and historical significance of the location. number includes 1181 field observations of bedrock outcrops, 601 SSURGO Soil Survey bedrock outcrops, Z 1 Lp Ltd 7 0 Lp 5 11 10 0 L 5 2 Mp a 1 12 6 Mp 1 13 5 1 6 Lp k Hp 1 1125 Additionally, the crushed stone pot ential associated with a map unit does not imply that and 2734 wells within Olmsted County that contain depth to bedrock values, and 427 wells from the Quarry Mp Hp e 6 Z Lp u 0 aggregate resources exist everywhere within a given map unit. Crushed stone potential defines surrounding counties, that help to more accurately model the bedrock surface elevation in the area of the 0 Mp m Quarry 1 b Quarry 1 Lp Mp Lp 1050 ro Mp Olmsted County, MN an area where there is geologic evidence to support a particular map unit designation, but the Lp Olmsted County border. The overburden thickness is determined by subtracting the modeled bedrock Mp Produced by the Aggregate Resource Mapping Program variability of geologic processes cannot be fully characterized at the scale of this map. The map elevation from the surface elevation. 5 5 Lp Mp 1 Mp ng Lp 7 Mp 07 Lp i 9 Hp Quarry 107 5 r 5 27 Sp Lp Division of Lands and Minerals was created at a scale of 1:100,000 but is presented at a scale of 1:63,360. A larger scale was used r r Ltd 11 Mp e Like other types of models, a bedrock surface elevation model is only as good as the data used to create it. 1 0 Ltd 0 lv to display the printed map in order to show more detail for those c hoosing to use a paper copy 1 118 i 0 0 Hp 5 12 S 0 In Olmsted County, some CWI reports contain over-simplified geologic information, which make it difficult 0 1100 Minnesota Department of Natural Resources 1 of the map to locate areas of crushed stone potential. Fo Quarry rk 1025 Mp Mapped By Steve Kostka and to accurately define the depth to bedrock at that location. In other instances, a bedrock exposure may have 1 1 Hp Mp Lp 0 3 been artificially created by removing the overburden during road building or other construction activities. 0 Mp Lake ORONOCO Mp 12 247 247 Jon Ellingson METHODOLOGY: Aggregate resources are mined from the earth, which dictates that geologic Potsdam This situation can artificially decrease the modeled overburden thickness in the area because there is no Quarry Shady Hp Ltd St. Paul, Minnesota - May 2010 evaluations are used to determine the location, distribution, and quality of a potential aggregate simple way to account for the missing overburden. The number of data points used in the model also affects Zu 1 Mp m 0 Lp 1 N E W H A V E N 0 0 Mp 2 b Lp 1 source. Because the crushed stone potential of a bedrock unit is pa rtially dependent on the 0 Hp 1 the ability of the model to accurately represent the overburden thickness. In Olmsted County there are areas 5 1 r 5 5 0 2 Map Scale 1 : 63,360 o 1 0 Mp Lp 5 1 Lp 0 18 thickness of material that must be removed to access the rock, a simple geologic model is used to that do not have an abundance of information about the depth to bedrock. Fortunately these areas are not as Lp Crushed Stone Potential Mapped at 1:100,000 50 identify bedrock within 50 feet of the earth’s surface. The model combines bedrock information 31 Lp 9 er FARMINGTON large, nor as numerous, as found in less densely populated counties. Ltd Hp Riv 1150 Hp INTRODUCTION: The purpose of this plate is to display the distribution of crushed stone from field observations, the County Well Index (CWI), exploratory drilling logs, bedrock data 9 7 Crushed stone potential is based on a 1:100,000-scale bedrock map of Olmsted County constructed for this r 5 (aggregate) potential of bedrock within 50 feet of the earth’s surface in Olmsted County, from Natural Resource Conservation Service (NRCS) soil surveys, Minnesota Geological Survey e Hp Mp T.108N. v Mp Lp i Hp T.108N. 1075 project. Bedrock contacts in the Rochester area are mapped on two-foot contour intervals based on surface Lp R 5 Lp Minnesota. Crushed stone is produced by mechanically reducing dolostone or limestone (MGS) outcrop data and MGS bedrock geology maps. The computer model uses data from these 10 2 7 ORONOCO0 5 Mp Hp 1 sources to estimate the depth to bedrock and interpret crushed stone potential where durable, elevation and bedrock elevation data provided by the Olmsted County Environmental Resource Services Hp 12 Ltd bedrock into desired sized particles that have a consistent composition, angular shape, and can 5 1 Ltd Mp 2 1 Department. The remainder of the county is mapped using ten-foot contour intervals because higher Mp Hp 0 0 Lp 2 0 5 meet specifications for aggregate used in building roads, bridges and airport runways. high-quality bedrock is located within 50 feet of the ground surface. 75 Hp 1 1 Mp Quarries Gravel Pit above 0 1 1 1100 m resolution elevation data were not available for the entire county at the time the bedrock map was u 1 Quarry l 0 reek Lp Mp Ltd Unfortunately, crushed stone resources are not evenly distributed across the state or within a P 5 C 1100 00 Ltd Ltd CWI is an important data source and accounts for most of the subsurface information used to 0 Gravel 10 21 single county. The usefulness of a crushed stone resource depends on the physical and constructed. The high-resolution elevation data area is identified on the map on this plate by the heavy

Quarry 1 model depth to bedrock. The CWI is an online database (www.health.state.mn.us/divs/eh/cwi) 1 Pit above 1 5 0 1 ou dashed line surrounding the Rochester area. The bedrock information that serves as the basis for the 0 S t h 5 2 0 2 Lp Mp 5 compositional characteristics of the bedrock as well as the overburden thickness. For example, 1 Quarry 0 1 5 Lp 1 o 0 1 r Ltd developed and maintained by the MGS and the Minnesota Department of Health that contains Quarries Quarry 1 b 52 in Olmsted County, dolostone is a hard, fine-grained rock that has the potential to be a durable crushed stone potential map is based, in part, on data from the Minnesota Geological Survey, including the 0 m 20 u basic information for over 300,000 drilled wells throughout Minnesota and has two levels of data 1 1 state map series, S-20: “Geologic map of Minnesota, bedrock geology,” (1:1,000,000, Morey and Meints, Ltd Z 1 aggregate source, while shale is soft and flaky and is unacceptable as an aggregate source. Hp 2 00 Mp 5 11 accuracy: located and unlocated. Located CWI data are assumed to be accurately located. 0 2000), the county atlas series, C-3: “Geologic Atlas of Olmsted County, Minnesota,” (1:100,000, N.H. Balaban, 5 0 1 0 Overburden refers to glacial sediment, or shale, on top of a desired resource, that must be 1 Lp 5 5 63 1 Hp 1 11 Unlocated CWI data are used as a source only if the address information on the well log can be 0 10 1 1 0 75 Mp ed., 1988), report of investigation number 36, RI-36: “Paleozoic Lithostratigraphic Nomenclature for 0 removed to access the underlying resource. 1 5 2 Hp Lp verified and located using a number of general information sources: parcel data from the county 0 1 Minnesota,” (Mossler, 1987), report of investigation number 65, RI-65: “Paleozoic Lithostratigraphic 0 5 Geologic data, such as exposed bedrock outcrops, subsurface water well data, previous geologic tax records, address information, and online address location web sites. The well locations are Lp 1 1 Lp 0 W A B A S H A C O Nomenclature for Minnesota,” (Mossler, 2008), and a digital bedrock geologic map for Olmsted County as 1 2 Lp Ltd 5 Quarry 5 Hp 1 7 studies, and verbal communication with local aggregate producers, provide the basis for the further refined using published county parcel maps, plat maps, air photographs, and road maps. 1 Ltd 1 0 Mp Ltd F part of open file report OF07-07: “Bedrock geology, topography and karst feature inventory of Steele, Dodge, 2 0 1 5 2 o Lp 0 5 5 r Lp 0 k 36 interpretations used to define the crushed stone potential of bedrock in Olmsted County. This is Once the address and parcel location of a well is confirmed, the well is placed near a 31 1 36 31 36 31 Olmsted and Winona counties, (Tipping and others, 2004). 5 Lp 1 Mp 2 0 1 5 2 10 3 00 14 Hp Mp Quarries 0 00 Ltd 11 R.12W. W A B A S H A C O R.11W. The final determination of crushed stone potential integrates the existing geologic maps and interpretations, 5 Ringe 122 1 14 14 0 the physical characteristics of the bedrock units and the overburden thickness. The crushed stone potential Quarry Genoa 14 11 2 1 5 Douglas 10 Lp 25 1075 0 Mp 0 Lp 0 Lp Quarry 97 of map units are classified as high, moderate, low, or limited. Mapping units that have been classified as 0 110 r 5 Hp 1 Hp Ltd 24 0 e 112 5 5 t 0 a 5 7 22 Ltd 0 2 w either high or moderate potential are defined as having significant potential for crushed stone resources 1 0 e 1150 1 5 2 10 Hp it 1 2 0 0 1 0 1 1 0 D O D G E C O 2 Lp h Lp 1 0 1 6 W 51 1 10 Lp 1 Hp 1 6 1 7 Ltd 7 6 r 8 1 2 1 5 1 1 6 while areas classified as low or limited potential are considered nonsignificant resources. The e 9 6 0 0 25 85 v M 0 0 0 i i Mp 25 9 implementation of this classification system is described in the Crushed Stone Resource Potential section d Ltd 5 1 10 5 R

d 2 0 Lp Ltd 1 133 1025 50 15 0 0

l 1 Ltd 12 42 0 0 e 1150 Quarry 1 and is illustrated in Table 1. Lp Quarry 124 5 Hp 1 Mp 2 5 1 1 2 Mp 1 Gravel 1 5 0 1 150 Ltd 7 1 An example of how the lack of data creates uncertainty in defining crushed stone potential can be seen in the 1 0 5 Pits Above 0 Lp 5 50 HAVERHILL5 2 Ltd geologic cross-section in Figure 1. Bedrock elevation trends can be seen along the length of the cross-section, 0 2 1175 1 1 Quarries Lp 1 Mp Hp Ltd 10 1 1 Hp 0 11 B 1175 9 but the lack of additional well points forces us to estimate the change of the bedrock surface between the 5 ran CASCADE 5 1200 22 0 1 ch 1 1 Mp 5 N 1 1 Lp 7 11 0 1 . 0 0 5 Mp Lp 2 0 well points. We must assume that the bedrock surface elevation changes only enough to reach the bedrock 0 1 Gravel 120 1 F Quarry Mp Lp Lp 07 Ltd 0 o 5 Pits above Ltd r elevation defined at the next well point along the line. This creates a series of straight lines that are an 1000 k 1075 25 2 10 2 Hp Quarries 12

0 unlikely estimation of the actual elevation of the bedrock surface between data points. This is especially

5 Ltd 1 Lp 2 1 Mp 1 W Lp 2 Ltd Hp Mp significant as the distance between well points increases. While there are areas within Olmsted County 5 h 124 i Mp 1 3 t 1125 Quarry 1 25 Lp Mp e where few well points are available, there are not enough of these areas to affect the crushed stone potential South 2 12 w 5 5 0 1 1 1 Ltd 4 250 Ltd 7 a 0 1 2 t 11 2 value assigned to individual polygons when mapped at a scale of 1:100,000. 20 Lp 1100 1 e 5 5 0 22 Gravel Pits Hp r 1 Lp 0 1 3 115 1 11 Lp Above 25 050 7 Mp Lp 2 00 5 10 1 24 5 5 07 Mp Quarries Viola 0 Ltd Lp 1 5 Quarry 112 2 2 CRUSHED STONE RESOURCE POTENTIAL: In Olmsted County, the interpretation of geologic evidence 11 2 Ltd 115 T.107N. Lp 5 0 1 0 Lp 0 1 at the reconnaissance level is the basis for defining crushed stone potential, not economic feasibility nor 5 2 7 T.107N. Lp 22 97 1 1 Lp 5 1200 15 1 Mp Ltd 1 0 Hp 2 Ltd cultural considerations. This assessment does not imply that economic crushed stone resources exist 1 2 7 11 5 Quarry 5 75 Mp Hp Mp 1 2 2 1 4 0 everywhere within a given map unit designated as “Potential Crushed Stone Resources.” Rather, that 15 0 5 Hp 0 22 1 Mp KALMAR Lp Mp Lp 1 2 0 QUINCY 1 VIOLA 0 0 1 within a map unit similar geologic processes were responsible for producing the bedrock, but over time 5 0 100 0 2 50 2 7 2 12 1 5 5 1 Hp 2 erosion has removed more bedrock in some areas than in others. In most instances, the bedrock surface is Lp 2 1100 1 R Mp 1 i 1 22 Lp 2 v 1 2 e Quarry 7 50 buried by sediment that obscures our view of the rock and creates some uncertainty about the crushed stone Mp Lp 5 r 5 10 104 1150 Mp 4 Quarries potential within an entire map unit. There are areas within Olmsted County where few well points are 1075 Mp Quarry available, but not enough of these areas exist to affect the crushed stone potential value assigned to r Mp 1 1025 156 lve 1275 075 1 75 Si Ltd 1 0 7 Lp individual polygons when mapped at a scale of 1:100,000. While geologic measurements of aggregate 0 Ltd 1 1 Mp Hp 0 175 C r 10 14 Quarry e 1 1 deposits remain relatively constant, economic criteria and environmental standards can vary across time and 63 0 2 Ltd e 27 5 0 0 k 5 1125 1 11 Mp Lp 1 1 Lp place. Important site-specific factors such as ownership, zoning, protected waters and wetlands, distance to Mp Silver Mp 300 1 5 1 Hp 2 5 1 1 1 Mp 1250 12 200 Lp Hp 1 Mp markets, and access, are important to the decision-making process for locating a new quarry, but they are BYRON 00 0 Lake 0 Mp 7 Quarries Lp Lp 5 outside the scope of this study. 117 r 22 5 36 31 hitewater Rive 36 31 36 31 52 36 31 36 31 W 1 1 12 SIGNIFICANT POTENTIAL FOR CRUSHED STONE RESOURCES: Bedrock geologic units of dolostone 14 2 15 Lp 00 2 Mp 0 Lp 5 Lp Quarry 1100 1250 and limestone having the necessary quality to produce crushed stone aggregate and are buried by limited 150 Mp 1300 Ltd 34 1 Lp ROCHESTER 9 9 overburden. The quality information is derived from Aggregate Source Information System (ASIS) test data 34 Mp Lp 34 9 1 175 Mp as well as through existing crushed stone industry use in Olmsted County. The geologic units are the Ltd 5 22 Mp Mp 5 7 5 Mp 7 11 1 07 Hp Mp 1 5 Ltd 1 1 5 Oneota Dolomite, Shakopee Formation, Stewartville Formation, and the Prosser Formation. Where 1 W I N O N A C O eek 2 22 Lp 2 r 2 Mp C 5 42 Ltd 1 Lp 109 Mp 1 6 Ltd 1 classified as having significant potential for crushed stone resources, t hese bedrock units are buried by less 1 1 6 1 6 Hp 6 1 6 Hp 0 0 Lp Lp Ltd 0 than 30 feet of overburden. Though each of the above mentioned bedrock formations can be used for Lp 1 11 Lp 14 2 Mp 1 0 75 100 1 Quarries Ltd Ltd 1 Chester 0 0 producing crushed stone aggregate, all of the units contain layers of lower quality rock that are not suitable 1200 0 14 Lp for crushed stone aggregate. Crushed stone quarries located within these map polygons are classified as 1 1 Mp Mp 5 1 Lp 112 1 0 22 Quarry12 5 identified resources. A brief description of each formation is included below. 2 Lp Cascade 5 5 2 Quarry 3 7 Mp 5 Lp 1 1 25 1 100 1125 Lp 11 175 1 104 1 36 Mp Hp High Potential for Crushed Stone Resources: Dolostone and limestone bedrock units exposed at 1 63 Ltd 14 Lp 1 1 1 75 2 5 1150 25 25 0 11 Ltd 00 7 2 0 1 the land surface or buried by less than 15 feet of overburden. Based on the rock types observed in 5 0 1 10 1 75 12 Lp 7 2 Ltd 25 Lp 0 this study, the Oneota Dolomite, Shakopee Formation, and the Stewartville Formation are Ltd 1175 0 SALEM 50 1 1 0 8 Lp Quarry Ltd 1 5 0 Mayowood 125 143 143 classified as having high potential for crushed stone aggregate resources . 146 5 Lp Quarry 7 1 1 0 Lake 1 225 0 7 1 DOVER Stewartville Formation: Medium- to thickly-bedded dolomite or dolomitic limestone; may also occur as 115 5 1 Quarry Mp 2 Ltd 7 Lp Lp Salem 112 0 ar 5 thinly-bedded limestone similar in appearance to the Prosser Limestone . The Stewartville Formation is 200 5 115 19 e Mp EYOTA 1 B Corners Lp Hp Mp Lp 25 1225 Lp reek 1150 typically 70 to 80 feet thick and primarily occurs in the south-central and southwestern areas of the county. Lp C 1225 Quarry 1 Mp 0 0 Lp Shakopee Formation: Thinly-bedded dolomite with minor sandstone and shale beds throughout the upper 1 7 25 14 1175 1 Lp 5 1 Lp 25 2 1250 Mp 12 5 100 feet. The Shakopee is approximately 120 to 150 feet thick. The Shakopee Formation is the upper -most Lp 12 Quarry Lp er 25 0 at bedrock unit in much of the northern part of the county and is normally limited in exposure to road cuts or m C 0 142 Mp ale ree 1100 Quarry ew T.106N. S k Lp Quarries 2 it River T.106N. Hp Quarry Lp 1 EYOTA h 36 W 1125 along river valleys. The sequences of sandstone and shale reduce the quality of the bedrock within these Quarry 1 5 5 Ltd DOVER Lp 2 7 7 Lp 0 32 0 2 1 Mp 0 1 Quarry intervals. 1 0 1 Quarry 1 1 0 Lp 52 11 Lp 42 1 15 Ltd 0 23 1 Mp Ltd 11 Oneota Dolomite: Massive, thickly-bedded dolomite occurs in the upper portion of the formation while the 22 5 5 Lp 63 Lp 0 0 Mp 5 Mp lower part is dominantly dolomite with inter-bedded sandstone, sandy dolostone, and minor amounts of 0 Mp 1 Mp 1 23 Lp 2 shale. The Oneota is typically 150 to 185 feet thick. Limited exposures of the Oneota Formation are located in Lp Lp 0 10 0 Lp 19 1300 Mp Quarry Mp 1 the extreme northeastern corner of the county in the Whitewater River valley. The sequences of sandstone Quarry 1 10 123 Mp Lp 1 Ltd 0 5 0 Lp and shale reduce the quality of the bedrock within these intervals.

ROCHESTER Quarry Mp 0 3 90 125 0 Moderate Potential for Crushed Stone Resources: Dolostone and limestone bedrock units 90 0 Mp Ltd Lp 3 111 5 Mp 1

1 Lp 7 2 Hp 1200 2 Mp Lp 1 1 5 buried by 0 to 30 feet of overburden. The bedrock units mentioned above (with 16 to 30 feet of 0 1 Quarry 1 5 0 0 1 2 Mp 29 1 k Lp 129 overburden), as well as the Prosser Formation (with 0 to 15 feet of overburden), are classified as 17 ee 5 12 r Lp 132 0 1 C Mp 0 5 having moderate potential for crushed stone aggregate resources. 2 2 5 Lp 2 1 MARION 0 Quarry 1 1 Quarries 50 Ltd 32 12 Prosser Formation: Thinly-bedded limestone with thin layers of shale. Limestone beds vary in thickness 1175 75 Quarry Ltd 111 31 36 1150 36 31 36 31 36 5 Mp from an inch to several inches. The Prosser Formation is typically 50 to 70 feet thick and is primarily limited 31 36 31 Mp 1 7 2 2 Lp 1 5 7 Lp Quarry Ltd MARION 0 10 Lp to the eastern and southern portions of the county. Ltd Predmore 19 Mp 20 Mp Mp Quarries Lp Hp 10 Mp Quarries 16 NONSIGNIFICANT POTENTIAL FOR CRUSHED STONE RESOURCES: Bedrock geologic units of 5 Quarry 2 r 00 dolostone, limestone, shaly limestone, sandstone, and shale that have low, limited, or no potential for 2 e 12 1 Lp Lp Mp 1 v 2 0 i 2 0 10 30 Mp 15 5 2 Mp Lp W I N O N A C O Mp R 1 crushing because of low rock quality or excessive overburden thickness. The units having nonsignificant th o 50 ow Quarry 52 D O D G E C O ou r 1 ill Mp S b 1 1 W 1 6 1 6 Mp Mp m 1 6 1 potential are found as part of the following bedrock geologic formations: Oneota, Shakopee, Stewartville, 6 Lp 1 6 Quarries 63 2 0 Ltd Lp u 0 250 5 15 Lp 1 7 5 1 Simpson 5 1 Z 90 k 1 2 Mp 1 B Prosser, Platteville, Cummingsville, Dubuque, St. Peter, Glenwood, Decorah, and Jordan. These formations Ltd r 2 r 2 5 1 a 1 o 5 Mp 20 2 n Quarry 17 0 16 2 Lp F Lp 1 ch 1 0 5 225 1 have varying bedrock and overburden thicknesses. 20 K 250 Quarry 1 Mp in Lp 16 Whitney n 26 Creek e Mp Lp Lp Rock y Lp 1 T Low Potential for Crushed Stone Resources: Dolostone, limestone, and shaly limestone bedrock 3 ro Lp C 2 u 5 t Dell Hp 1 r C Quarry Mp 1 e Ltd 0 1 r units buried by 0 to >50 feet of overburden. These map units include the following bedrock Quarry 0 e Mp 2 e 1 1 Hp k ORION 0 e Mp 275 Mp 0 k 1 formations: Oneota, Shakopee, Stewartville (with more than 30 feet of overburden), Prosser 5 19 1 Mp 2 1 1 7 7 3 1 Lp 5 0 Lp 7 5 1 0 5 Formation (with more than 15 feet of overburden), and the Platteville, Cummingsville, and 27 th 1 1 1 r 1 5 o 2 Mp 2 2 0 1 5 0 N 2 2 10 5 1 Dubuque Formations. Based on the characteristics of the rock types in this study, the Platteville, 1 0 Lp Ltd 1 1 0 7 Lp Mp Lp Lp 5 Cummingsville, and Dubuque Formations (with 0 to 15 feet of overburden) are designated “Low Quarry Mp 1 Ltd 2 Potential” for crushed stone resources. Quarries are found throughout the county where the 5 0 0 k 12 Lp e 00 0 5 Ltd 0 e Lp 0 2 5 Platteville Formation and Cummingsville Formation limestone have been mined, but many of the 1 Mp r 0 2 1 Mp 11 1 1 ELMIRA 50 1 1 30 2 C 52 2 5 5 Ro 1 1 0 quarries are abandoned because they are either too small or the crushed stone produced from Mp o 1 Lp 150 2 HIGH FOREST t 1 7 0 25 7 12 5 5 5 Hp 1 1 these formations cannot meet current construction aggregate quality specifications. The 2 Quarry 1 0 Hp 1 2 5 1 0 0 0 8 3 2 Hp R O C K D E L L Lp 1 90 5 0 Lp 0 Quarry Dubuque, Cummingsville, and Platteville Formations are briefly discussed below. Mp 1 R Mp Lp Lp 1 Hp Quarries 2 1125 iv 0 10 30 30 Mp 0 0 130 0 0 0 e 0 1 12 Mp Hp r T.105N. Dubuque Formation: Medium-bedded limestone with alternating thinly bedded shale. The Dubuque 1 Lp 5 1 T.105N. 11 7 Lp 1 7 7 2 Mp 5 127 5 0 1 1250 5 19 0 5 Ltd Formation is typically from 20 to 30 feet thick and is limited in occurrence to the southwestern portion of the Hp 107 1 Ltd 3 Lp 5 Lp 1 0 Ltd Quarries 0 Lp A' county where it is typically buried. 3 1 1 Mp 1 5 Hp 0 75 7 129 M 5 2 1 ) i 1 Mp 1 e 1 Lp r l Cummingsville Formation: Inter-bedded limestone and shale. Limestone beds typically alternate with u 1 g l Ltd e e F i Quarries 2 n ( S 0 5 t i o 0 7 Hp s - S e c Mp Mp successions of thin beds of green/gray shale. The Cummingsville Formation ranges from 60 to 70 feet thick 1225 1 C r o s Mp 1 C Mp Mp r 1 1 Cummingsville Mp ee 0 10 and is generally found in the southern half of Olmsted County. Quarry e k 5 0 Mp g 1 5 11 0 3 7 k 1 id 1 25 1 e r 0 Lp 2 Lp t Lp e Mp 7 1 ) r 0 Ltd r e a 1 r Platteville Formation: Thin- to medium-bedded limestone with very thin shale layers. Shale is more 5 F i g u P Hp 2 e 1 5 1 8 ( S e C 2 o n 1 0 0 i 0 e c t 5 0 Hp S h - 0 prominent in the upper portion of the formation while sandy limestone is more prevalent in the lower s s 20 Hp 0 r o c C Lp Hp 1 1 13 0 n 1 5 Mp 2 Quarry y 0 Mp 5 portion. The Platteville is approximately 20 feet thick throughout the county but can be as thick as 25 feet. Mp Ltd L 5 A Pleasant Mp Hp Mp Ltd 132 Quarry Mp Hp Lp 1 1250 1 1 The Platteville Formation is present throughout Olmsted County, occurring in natural exposures, roadcuts, 2 Lp 15 00 75 Grove 0 0 Quarry 35 30 and commonly capping small buttes and plateaus.

0

1 0 1 3 2 3 Mp PLEASANT GROVE 2 1 130 5 0 1 5 2 0 1 Mp 1 Limited Potential for Crushed Stone Resources: Dolostone, limestone, shale, sandstone, and Hp Hp 1 1 0 1 Ltd Quarry Hp 0 1 Mp 0 7 0 1 Mp 5 0 shaly limestone units buried by 0 to >50 feet of overburden. These map units include all of the Mp 3 Quarry 0 30 30 36 36 31 30 Lp 36 0 31 36 31 31 Ro 36 31 30 1 125 previously mentioned bedrock formations found in Olmsted County, as well the Maquoketa o 1 0

B t ra 2 Mp n Mp Ltd Ltd Quarry 5 1

c 5 1 9 h 7 CHATFIELD Formation (limestone), sandstones of the St. Peter and Jordan formations, and shale of the Lp 2 Mp r High STEWARTVILLE 7 138 5 5 10 Mp Hp No Hp e 2 2 Lp 22 Lp 00 rt v 5 1 1 h Quarries Mp Lp i Forest Glenwood and Decorah formations. The sandstone and shale formations lack the necessary R 6 1 2 R.12W. R.11W. durability required of an aggregate resource, regardless of the overburden thickness. General 0 R.13W. FILLMORE CO FILLMORE CO 0 Lp 1 275 nson Cr Quarries k Mp bi ee e Ltd descriptions of these formations are given below. Ro k e Lp r 130 Ltd 0 C 8 6 Hp 1 1 Maquoketa Formation: Thinly bedded fossiliferous limestone with thin beds of dolostone and shale; chert 6 1 6 2 0 50 5 2 arey IDENTIFIED CRUSHED STONE RESOURCES: Sites where crushed stone resources have been, or are currently, nodules are common. The Maquoketa Formation is approximately 70 feet thick and has a gradational contact 5 1 C 7 Figure 1: Bedrock Geology Cross-Section 2 Lp 1 90 63 3 Ltd Ltd being mined. Crushed stone quarry locations have been gathered from several different sources, including with the underlying Dubuque Formation. Limited in occurrence to the southwestern portion of the county The cross-section in Figure 1 helps Stewartville Formation is covered by difficult. Consequently, the The bedrock surface elevation trend where few well points are available, topographic maps, aerial photographs, county records, county highway department maps, soil surveys, M n/DOT and is typically buried. R.15W. M O W E R C O R.14W. illustrate the crushed stone more than 15 feet of glacial till. Stewartville Formation would be can be seen along the length of the there are not enough of these areas files, fieldwork, quarry operators, and other miscellaneous sources. The crushed stone quarries range in size from Sandstones The map was created at a scale of 1:100,000 but is presented at a scale of classification scheme for Olmsted Based on the matrix in Table 1, the considered to have “limited cross-section, but the lack of to affect the crushed stone potential less than 1 acre to greater than 50 acres and may be active, inactive, depleted, or reclaimed. The size of the points Map Scale 1:63,360 St. Peter Sandstone: Fine- to medium-grained, poorly cemented, quartzose sandstone. The St. Peter 1:63,360 to display more detail for those choosing to use a paper copy of the map This map was prepared from publicly available information. Every reasonable effort has been made to ensure the accuracy of the factual data County as well as some of the Stewartville Formation in the potential.” The crushed stone additional well points forces us to value assigned to individual indicates the relative areal extent of the quarry. to locate areas of crushed stone potential. on which this map interpretation is based. However, the Department of Natural Resources does not warrant the accuracy, completeness, or Sandstone ranges in thickness from 80 to 100 feet. It is present throughout the county and can be easily 1 inch equals ~1 mile issues associated with limited vicinity of Point “2” would be potential assigned to the assume that the bedrock surface polygons when mapped at a scale any implied uses of these data. Users may wish to verify critical information; sources include both the references here and information on file Small Medium Large 0 1 2 3 4 geologic control points. At point assigned a value of moderate or low Stewartville Formation at each of between the points changes only of 1:100,000. recognized by its white/orange color, lack of major structure, and slope-forming tendency. In Olmsted Miles in the offices of the Minnesota Geological Survey and the Minnesota Department of Natural Resources. Every effort has been made to ensure < 5 5-15 > 15 Size in Acres County, the St. Peter Sandstone is a significant source of industrial sand. Kilometers the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, “1,” the Stewartville Formation is potential depending on the the three locations only considers enough to reach the bedrock surface 0 1 2 3 4 5 6 boundaries, or locations of improvements. exposed at the surface and would thickness of glacial till. Finally, the the quality of the bedrock and the elevation defined at the next well Crushed Stone Quarries: Sites that have been or are currently being mined. Jordan Sandstone: Medium- to coarse-grained, cross-stratified quartzose sandstone. The Jordan Sandstone

is approximately 80 feet thick and is limited in exposure to the Dry Run Creek valley in the north and the 1 centimeter equals ~0.63 kilometers be easily accessible for quarrying. area indicated at point “3,” shows overburden thickness. In Olmsted point along the line. This creates a Mn/DOT Identified Crushed Stone Sites: Sites were identified by Mn/DOT as part of the The Stewartville Formation is a the Stewartville Formation beneath County, the sediment deposited on series of straight lines that we Whitewater River valley in the northeast. Aggregate Source Information System (ASIS). Most sites are located on private property Overburden Crushed Stone Table 1: Classification Matrix of Crushed Stone Potential durable dolostone and would be more than 50 feet of glacial till. At top of the eroded bedrock obscures presume to reflect the actual Formation Description Quality and leases are not necessarily active. Some locations were modified to better correlate to Shales Thickness (ft.) Potential The Crushed Stone Potential matrix in Table 1 lists the twelve bedrock units, in stratigraphic designated as having high potential this location, the overburden atop our view of the rock, creating some elevation of the bedrock surface present quarry boundaries. Decorah Shale: Large successions of thinly-bedded shale with thin beds of limestone identifiable by its stark Maquoketa Shaly Limestone Low > 50 Limited order, found at or near the land surface in Olmsted County, as well as the characteristics used for crushed stone resources at this the Stewartville Formation is so uncertainty about the crushed stone between data points. While there Gravel Pits Above Crushed Stone Quarries: Sites that have been, or are currently green/gray color and lack of structure. The Decorah Formation is approximately 40 feet thick, but can be as to determine the DNR crushed stone potential classification of bedrock units. The crushed location. At point “2,” the thick that quarrying would be potential within an entire map unit. are areas within Olmsted County Shaly 0 - 15 Low being mined. These sites contain sand and gravel pits on top of limestone or dolostone thick as 60 feet. It is exposed throughout the county, usually heavily vegetated, and is generally limited to Dubuque Low stone potential of a bedrock unit is a function of the quality of the bedrock as a crushed stone Limestone 16 - 30 Limited bedrock. locations where overlying Cummingsville Formation limestone still exists. source and the overburden thickness. The quality of the bedrock refers to the ability of a CWI Well with Unique Well Number Glenwood Formation: Thinly-bedded shale with thinly-bedded, intermittent sandstone beds. Upper portion 0 - 15 High bedrock unit to meet specifications for use as an aggregate source while overburden thickness Mn/DOT Identified Gravel Sites Above Crushed Stone Sites : Sites were identified by 1350 1350 of the formation is predominantly green shale, with sandstone inter-beds occurring in the lower portion of 16 - 30 Moderate is a measure of the accessibility of the bedrock for quarrying. In Olmsted County the Oneota A CWI Well Depth A' Mn/DOT as part of the Aggregate Source Information System (ASIS). These sites contain Stewartville Dolostone High sand and gravel deposits on top of limestone or dolostone bedrock. Most pit-quarries the formation. The Glenwood Formation is typically 6 feet thick, but can range from 2 to 8 feet thick. The 31 - 50 Low Dolomite, Shakopee Formation, and Stewartville Formation are durable dolostone units that 139139 3 2 1300 411282 1300 with this designation have been or are currently being mined and some sites are located Glenwood Formation is present throughout the county and is typically associated with the Platteville > 50 Limited do not contain significant amounts of poor quality rock such as shale or sandstone. The 104977 449409 Oneota Dolomite and Shakopee Formation are primarily found near the surface in the on private property and leases are not necessarily active. Formation. 0 - 15 Moderate 219576 1 northern half of the county while the Stewartville Formation is at or near the surface in the 1250 644805 598486 1250 Stewartville General References Prosser Limestone Moderate 16 - 30 Low GEOLOGIC DATA SOURCES FOR MAP UNIT INTERPRETATION: Field observations and the County Well southern one third of Olmsted County. While the Oneota Dolomite, Shakopee Formation, and 105007 Formation Anderson, H.E., 2002, Aggregate Resources, Dodge County, Minnesota Department of Natural Resources, Division of Lands and > 30 Limited the Stewartville Formation are the most desirable crushed stone sources in Olmsted County, Glacial Sediment North Branch Index (CWI) database were data sources used in the interpretation of aggregate potential. 1200 Root River 1200 Minerals, Report 357, Plates I, II, III, and IV. Shaly 0 - 15 Low their crushed stone potential decreases as the overburden thickness increases. This concept is Field Observations: A total of 1695 field observations, including 207 gravel pits and quarries, were Morey, G.B. and Meints, J.P., 2000, Geologic map of Minnesota be drock geology, Minnesota Geological Survey, State Map Series S -20, Cummingsville Low scale 1:1,000,000. illustrated in Figure 1. logged during the fall of 2003 and spring of 2004. Surficial geologic sediment, glacial stratigraphy, and Limestone 16 - 30 Limited 1150 1150 Mossler, J.H., 1987, Paleozoic lithostratigraphic nomenclature for Minnesota, Minnesota Geological Survey, Report of Investig ations 36. The only other bedrock unit that can be considered a significant crushed stone source is the bedrock formations were observed in road cuts, stream exposures, excavations, judicial ditches, Mossler, J.H., 2008, Paleozoic lithostratigraphic nomenclature for Minnesota, Minnesota Geological Survey, Report of Investigations 65. Decorah Shale Very Low 0 - 15 Limited Prosser Formation construction projects, trenches (cable, pipe, tiling), and even animal burrows. Olsen, B.M., 1988, Bedrock geology of Olmsted County, in Geologic atlas Olmsted County, Minnesota. (N.H. Balaban, ed.), Minnesota Prosser Formation limestone where it is buried by less than 15 feet of overburden. The Prosser 1100 1100 Moderately 0 - 15 Low Geological Survey County Atlas Series Atlas C-3, scale 1:100,000. Platteville Limestone Formation contains thin layers of silt or sand and is not as durable as the dolostone of the North County Well Index Locations: The County Well Index (CWI) is an online database maintained by the R.G. Tipping, J.H. Mossler, E.C. Alexander, Jr., Y. Gao, J. Green, and S.C. Alexander, 2004, Bedrock geology, topography and karst feature Low 16 - 30 Limited Branch Oneota, Shakopee, and Stewartville Formations. Consequently, the Prosser Formation in Cummingsville Formation Decorah Shale Minnesota Geological Survey and the Minnesota Department of Health containing approximately 4063 (as inventory of Steele, Dodge, Olmsted and Winona counties, Open File Report O F07-07. 1050 1050 Glenwood Shale Very Low 0 - 15 Limited Olmsted County is considered to be a moderately desirable crushed stone resource. The Root River of 2007) wells located in Olmsted County. Approximately 1 900 wells in Olmsted County are considered Mapping Sources: St. Peter Sandstone Very Low 0 - 15 Limited remaining bedrock units in Olmsted County lack the quality to serve as a crushed stone source to have geological descriptions that are appropriate for the crushed stone potential part of this project. Bedrock geology and bedrock model interpretation, fieldwork, and delineation of mapping units by Steve Kostka, 2007-2009 and Jon for concrete or asphalt, regardless of the overburden thickness. 1000 1000 0 - 15 High Ellingson and Ross Hoffman 2003-2006. Bedrock geology cross-section delineated by Steve Kostka wit h cartographic design assistance by Transportation Features Bounding Features Physical Features Kevin Hanson. Overburden modeling, bedrock geology geoprocessing, and locating the County Well Index unlocated points by Kevin Platteville-Glenwood Formations 16 - 30 Moderate Hanson, 2006-2008. Remote sensing sources were; NAPP (National Aerial Photography Program), 1991-1992, 9" x 9" color infrared photos Shakopee Dolostone High 950 950 90 Interstate Highway County Boundaries Lakes St. Peter Sandstone at 1:40,000; 1991 DOQs (Digital Orthophoto Quadrangles) at 1:12,000 from USGS (United States Geological Survey); FSA (Farm Se rvices 31 - 50 Low High-Resolution Area Rivers & Streams Base Map Data Sources: 52 US Highway Boundary Administration) Color Orthophotos collected from the following years; 2003 -04, 2005, 2006, 2008; FSA CIR (Color Infrared) Imagery > 50 Limited 110 Lakes, rivers, and streams from National Wetland Inventory, Mn/DOT Base map, MN DNR 24K Streams, compiled at 900 900 0 100 Ft. Elevation Contours collected in 2008; DRGs (Digital Raster Graphics) at 1:24,000 from USGS; 7.5 -minute USGS topographic quadrangles at 1:24,000 (dating Elevation (feet) - 20x Vertical Exaggeration 30 MN Highway PLS Township Boundaries t h 1:24,000 from aerial photography (1979-1988) and USGS quadrangle maps (1980-1990); PLS (Public Land Survey) townships 12 from 1964-1992); the Soil Survey Geographic Database for Olmsted County, published November 20 , 2006 from the USDA-NRCS 0 - 15 High 75 25 Ft. Elevation Contours and sections layers extracted from PLS Project, 2001, MN DNR; Populated places were derived from the GNIS (Geographic 25 Section Boundaries (United States Department of Agriculture - Natural Resource Conservation Service); USGS (United State Geological Survey) National County Highway Sections 1,6,31, & 36 labeled 16 - 30 Moderate Name Information System) by pulling out the features that were coded as populated places, 2003; County boundaries from 850 850 Elevation Dataset’s 1-arc second (30m) DEM, and where available 2-foot contour elevation data obtained from Olmsted County and then Oneota Dolostone High Shakopee Formation 111 Shaded Topographic Relief MN DNR, 1993; High resolution boundary from Olmsted County; Roads from Mn/DOT Base map, Fall of 2006; Railroad County Road A A' Geologic Cross-Section Line converted to 1/9-arc second (3M) DEM, and MGS Minnesota aeromagnetic grid (+/- 50 Meters horizontal accuracy) with micro-leveling 31 - 50 Low (see Figure 1) (Azimuth = 315, Altitude = 45) Tracks from Mn/DOT Base map, 2001; Contour Intervals created by smoothing the 30 Meter Digital Elevation Model (see Township and Other Roads (dating from 1961-1991). > 50 Limited topographic relief) and then applying ArcGIS 9.3 Spatial Analyst to create the contours; Topographic relief from a 3-meter 800 800 Populated Places Municipal Roads GIS and Cartography by Kevin J. Hanson, MN DNR, Division of Lands and Minerals. Copy edited by Nick Kroska, MN DNR Division of Waters. Jordan Sandstone Very Low 0 - 15 Limited digital elevation models (DEM) by the MN DNR in 2009 from LiDAR data flown in November, 2008 by Aero-Metrics 0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 By ron (Size of font type indicates Railroad Tracks relative populations) Distance (miles) Genoa © 2010, State of Minnesota, Department of Natural Resources Products of this project include a CD/ROM of maps, data, and metadata in a digital format and the following maps: Plate A, Report 375, Olmsted County Aggregate Resources, Sand and Gravel Potential & Plate B, Report 375, Olmsted County Aggregate Resources, Crushed Stone Potential