| Online link | https://geo-nsdi.er.usgs.gov/metadata/open-file/99-30/metadata.faq.html |
|---|---|
| Description | This Open-File report is a digital physiographic map database. This physiographic map of the Grand Canyon is modified from previous versions by Billingsley and Hendricks (1989), and Billingsley and others (1997). The boundary is drawn approximately along |
| Originators | Billingsley, George H. and Hampton, H. M. |
| Publication | U.S. Geological Survey Open-File Report 99-30 |
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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 |
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 |
Geologic map units at specific locations (same attributes as polygon coverage SUPERIOR_GLY.PAT)
| Label | Definition |
|---|
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. |