Deposits of the Lake Superior region

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/97-455/metadata.faq.html
Description This digital map portrays the bedrock geology of the states of Michigan, Wisconsin, and Minnesota taken from the most recent published regional compilations. Some minor modifications and generalizations have been made from the published maps. Informatio
Originators Cannon, William F.; Kress, Thomas H.; Sutphin, David M.; Morey, G. B.; Meints, Joyce; and Barber-Delach, Robert
Publication U.S. Geological Survey Open-File Report 97-0455

Related topics

States or counties

Overview of attributes

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SUPERIOR_FLT.AAT

Faults

Label Definition
FAULT_TYPE Type of fault or other linear map feature
PLOT_CODE Plotting code for fault type
SOURCE Numerical code for original data source for map feature

SUPERIOR_GLY.PAT

Geologic map units

Label Definition
MGS_CODE Minnesota Geological Survey Code as used in state map series
SOURCE Numerical code for original data source for map feature
ERA The geologic era in which the rock unit was formed
SYMBOL A unique letter symbol identifying each geologic unit as defined under the attribute "unit name" and the attribute "period"
PERIOD The geological period in which the rock unit was formed
SUBPERIOD The geological subperiod in which the rock unit was formed
SUPERGROUP The stratigrpahic supergroup to which a rock unit is assigned
GROUP The stratigraphic group to which a rock unit has been assigned
UNIT_NAME Stratigraphic name for rock units. For layered rocks, generally corresponds to formation name.
AGE Radiometric age or age range. Shown only for well constrained units.
RK_TYPE The general lithologic classification for the most abundant rock type in a unit
MAJOR_SUBTYPE The lithologic subtype of the most abundant rock in a unit
MAJOR_LITHOLOGY A specific lithologic name for the most abundant rock type in a unit
MINOR1_RKTYPE The general lithologic classification for a less abundant rock type in a unit
MINOR1_SUBTYPE The lithologic subtype for a less abundant rock type in a unit
MINOR1_LITHOLOGY A specific lithologic name for a less abundant rock type in a unit
MINOR2_RKTYPE The general lithologic classification for a less abundant rock type in a unit
MINOR2_SUBTYPE The lithologic subtype for a less abundant rock type in a unit
MINOR2_LITHOLOGY A specific lithologic name for a less abundant rock type in a unit
PROVINCE_ORIGIN The tectonic province in which rock units were formed
SUBPROV_TERRANE The tectonic subprovince or terrane in which rock units were formed
PROV_AGE Geologic age of province in which rock unit formed
REWORKING_PROV Tectonic province in which older rocks were modified by younger orogenic events
REWORKING_SUBPRO Tectonic subprovince in which older rocks were modified by younger orogenic events
REWORKING_AGE Age of younger orogeny that modified older rocks
ENV_OF_FORMATION The physical environment in which rock units were formed
TECTONIC_SETTING The tectonic setting in which rock units were formed
LITH_ASSEMBLY An assemblage of rock types characteristic of a unit

SUPERIOR_GLY.PAT

Geologic map units at specific locations (same attributes as polygon coverage SUPERIOR_GLY.PAT)

Label Definition

SUPERIOR_MRDS.PAT

Mineral resources in mapped area

Label Definition
RECNUM The Record Number is a unique seven-character alphanumeric code, such as W062456, for each MRDS record.
SITENAME The most recent name given to the ore body, deposit, or property, is entered for a property, mine, prospect, claim, occurrence, group, and so on. If the type is unknown, "occurrence" may be entered after the site name. If the ore body is a subunit of a larger unit, the larger unit name may also be included.
DISTRICT The most recent name of the mining district, subdistrict, or area. One of the words "district", "subdistrict" or "area" may be included for clarification purposes.
COUNTRY The Country in which the deposit is located.
STATE The U.S. State name or foreign country political subdivision in which the deposit is located.
COUNTY The name of the county in which the deposit is located.
COMMODITY This field provides for the listing of known commodities at a given site. The commodity code(s) may be ordered from most important to least important in the following order: major commodities, minor commodities, and trace commodities.
AGE Age of Mineralization The most specific relative geologic age abbreviation for the age of mineralization of the deposit at this site. Early (E) and late (L) are used rather than lower and upper. Multiple entries of absolute ages may be separated with semicolons.
ROCKTYPE The main rock type(s) hosting the deposit at this site.
ROCKAGE The most specific relative geologic age abbreviation for each of the rock types listed. If age is unknown, it has been left blank. Multiple entries of absolute ages per rock may be separated by semicolons (For example: PROT; U/PB ZIRCON 1760 MA; U/PB ZIRCON 1700 MA). Ranges may be separated by hypens (CRET-TERT).
DEPSIZE The general size of the deposit, if known. S (SMALL), M (MEDIUM), L (LARGE) or U(UNKNOWN). The key words represent different value ranges for the different commodities. Deposit size follows the scheme devised for the metallogenic map of North America (Guild, 1968) and refers to the amount of metal or mineral contained in the deposit at this site (that is, total production PLUS any reserves.
DEPTYPE n/a - data missing
PRODUCTION The entry options for this field are LARGE, MEDIUM, SMALL, YES, NO, and UNDETERMINED.
MAJOR The most important commodities that have been or are being produced at this site in decreasing order of significance. Most important can mean the following: coproducts; products of greatest economic significance; products most deliberately produced; the products of primary interest.
MINOR The commodity that are of secondary importance in relation to having been produced at this site. Secondary importance can mean: Byproducts, less abundant product; product of some economic significance; products least deliberately produced and product of least interest.