Browsing by Author "Jirsa, Mark A"

Now showing 1 - 8 of 8
  • Thumbnail Image
    Item
    Bedrock Geology Map of the Cavity Lake Fire Area: Cook County, Northeastern Minnesota
    (2007-08) Costello, Daniel E; Gál, Benedek; Hoaglund, Steven Arthur; Putz, Amanda J; Jirsa, Mark A
    This map is the result of three and a half days of mapping in the Cavity Lake burn area on Gabimichigami Lake. It is the third map in a series of maps produced by the Precambrian Research Center Field Camp for the summer of 2007. The mapping area included portions of the Ogishkemuncie Lake and Gillis Lake U.S.G.S. 7.5' Quadrangles. Mapping was performed primarily on Gabimichigami Lake,and extended north to Agamok Lake and east to Howard Lake and Peter Lake. The field area was split into two study areas: the basal contact of the Duluth Complex (Tuscarora intrusion),and the structural elements of the meta-sediments associated with the collapse of an Archaean caldera. The area was previously mapped by Gruner in 1938 in a large-scale regional mapping project of the structural geology of the Knife Lake area of north-eastern Minnesota. The purpose of this mapping was two-fold: 1) a capstone project for field camp students that provided hands on geologic experience in a serene wilderness setting, and 2) to assist in the larger goal of the state of Minnesota to remap the Boundary Waters Canoe Area.
  • Thumbnail Image
    Item
    C-47, Geologic Atlas of Rock County, Minnesota
    (Minnesota Geological Survey, 2020) Bauer, Emily J; Retzler, Andrew J; Jirsa, Mark A; Chandler, Val W; Pettus, Margeurite C; Gowan, Angela S; Hamilton, Jacqueline D
    A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.
  • Thumbnail Image
    Item
    C-48, Geologic Atlas of Nobles County, Minnesota
    (Minnesota Geological Survey, 2020) Bauer, Emily J; Retzler, Andrew J; Jirsa, Mark A; Chandler, Val W; Pettus, Margeurite C; Gowan, Angela S; Hamilton, Jacqueline D
    A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.
  • Thumbnail Image
    Item
    C-51, Geologic Atlas of St. Louis County, Minnesota
    (Minnesota Geological Survey, 2022) Bauer, Emily J; Jirsa, Mark A; Block, Amy R; Boerboom, Terrence J; Chandler, V.W.; Peterson, Dean M; Wagner, Kaleb G; McDonald, Jennifer M; Dengler, Elizabeth L; Meyer, Gary N; Hamilton, Jacqueline D
    A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.
  • Thumbnail Image
    Item
    C-54, Geologic Atlas of Lake County, Minnesota
    (Minnesota Geological Survey, 2022) Bauer, Emily J; Jirsa, Mark A; Block, Amy R; Boerboom, Terrence J; Chandler, V.W.; Peterson, Dean M; Wagner, Kaleb G; McDonald, Jennifer M; Dengler, Elizabeth L; Meyer, Gary N; Hamilton, Jacqueline D
    A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.
  • Thumbnail Image
    Item
    C-55, Geologic Atlas of Otter Tail County, Minnesota
    (Minnesota Geological Survey, 2023) Bauer, Emily J; Cicha, Jarrod; Radakovich Block, Amy; Jirsa, Mark A; Hirsch, Aaron C; Meyer, Gary N; Scott, Shawn B; Lively, R. S.
    A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.
  • Thumbnail Image
    Item
    C-58, Geologic Atlas of Lincoln County, Minnesota
    (Minnesota Geological Survey, 2023) Mayer, Jordan A; Bradley, Margeurite C; Retzler, Andrew J; Severson, Allison R; Jirsa, Mark A; Chandler, V.W.; Conrad, Daniel R; Gowan, Angela S; Block, Amy Radakovich; Hamilton, Jacqueline D
    A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.
  • Thumbnail Image
    Item
    GEOPHYSICAL AND PETROLOGIC ADVANCES IN UNDERSTANDING THE TAUNTON-BELT WEDGE, AN ARCHEAN TERRANE WITHIN THE MINNESOTA RIVER VALLEY SUBPROVINCE OF THE SUPERIOR CRATON, NORTH-CENTRAL U.S.A.
    (2023) Southwick, David L; Chandler, V.W.; Jirsa, Mark A; Boerboom, Terrence J
    The Taunton-belt wedge, defined herein, is an unexposed fault-bounded Archean terrane located within the Morton block of the Minnesota River Valley (MRV) subprovince of the Superior Craton. It is bounded on the north by the Yellow Medicine shear zone (YMSZ), a prominent regional structure that extends from the west margin of the Paleoproterozoic Penokean orogen in Minnesota to the east margin of the Paleoproterozoic Trans-Hudson orogen in South Dakota. The south boundary of the wedge is a less distinct curving fault zone that splays west–southwest from the YMSZ in south-central Minnesota and rejoins it in eastern South Dakota. The interior geology of the wedge is poorly known, owing to continuous cover of the Precambrian basement by Phanerozoic strata and Pleistocene glacial deposits. Regional aeromagnetic and ground gravity mapping indicate a broad belt of mafic metavolcanic and related rocks in roughly the northern half of the wedge, and many granitoid intrusions in the southern half. Geophysical signatures characteristic of layered gneiss, such as those observed over known gneiss elsewhere in the Morton block, are minor to absent.