| Online link | https://geo-nsdi.er.usgs.gov/metadata/open-file/95-691/metadata.faq.html |
|---|---|
| Description | This report describes the contents of a digital dataset which consists of four ARC/INFO Export format files. The dataset includes a digital representation of the Montana state geologic map. |
| Originators | Raines, Gary L. and Johnson, Bruce R. |
| Publication | U.S. Geological Survey Open-File Report 95-0691 |
Linear geological eastern Montana
| Label | Definition |
|---|---|
| ARC_TYPE | Short name for line type |
| LTYPE | Line type |
| MODIFIER | Type of contact, fault, fold or other |
| ACCURACY | Positional accuracy |
| FAULT_CONT | Denotes that arc is both a fault and contact |
| LINE_DESCRIP | LTYPE, MODIFIER, and ACCURACE combined and one attribute |
Geology of eastern Montana
| Label | Definition |
|---|---|
| FORMATION | Map unit symbol. This field provides a relational key to the associated table wmtgeol.tbl or emtgeol.tbl (these two tables are identical) which provides additional information about each formation. |
Linear geologic features
| Label | Definition |
|---|---|
| ARC_TYPE | Short name for line type |
| LTYPE | Line type |
| MODIFIER | Type of contact, fault, fold or other |
| ACCURACY | Positional accuracy |
| FAULT_CONT | Denotes that arc is both a fault and contact |
| LINE_DESCRIP | LTYPE, MODIFIER, and ACCURACY combined as one attribute |
Geology of eastern Montana at specific locations (same attributes as polygon coverage EMTGEOL.PAT)
| Label | Definition |
|---|
Linear geologic features of western Montana (same attributes as arc coverage EMTARCS.AAT with the additional attributes below)
| Label | Definition |
|---|---|
| ARC_TYPE | Short name for line type |
| LTYPE | Line type |
| MODIFIER | Type of contact, fault, fold or other (same attributes as EMTARCS.AAT with the additional attributes below) |
| ACCURACY | Positional accuracy (same attributes as arc coverage EMTARCS.AAT) |
| LINE_DESCRIP | LTYPE, MODIFIER, and ACCURACY combined as one attribute |
Geology of western Montana
| Label | Definition |
|---|---|
| FORMATION | Geolgic formation (no descriptions of map units found) |
Linear geologic features of western Montana (same attributes as arc coverage EMTGEOL.AAT)
| Label | Definition |
|---|
Geology of western Montana at specific locations (same attributes as polygon coverage WMTGEOL.PAT)
| Label | Definition |
|---|
This is a lookup table providing specific information about each geologic unit. The FORMATION field can be used to join this table with the polygon attribute tables of the wmtgeol and emtgeol coverages.
| Label | Definition |
|---|---|
| FORMATION | The map unit symbol used on the published map. This is the item that is related to the map coverage. This is not necessary a formation in the normal usage. It is a map unit. (String of width 11) |
| UNIT_NAME | The map unit name from the map explanation. (String of width 75) |
| ROCK_TYPE | The general rock category from the map explanation. Generally this is something like sedimentary, igneous, or metamorphic. (String of width 50) |
| ERA | Geologic era from the map explanation. (String of width 24) |
| SYSTEM | Geologic system from the map explanation (String of width 24) |
| SERIES | Geologic age information from the map explanation. (String of width 24) |
| LITH1, LITH2, LITH3, LITH4, LITH5, LITH6, LITH7, LITH8 | Lithology from the map explanation. LITH1 is the first-described lithology, LITH2 the second, and so on to LITH8. (String of width 40) |
| LOCATION1, LOCATION2 | Notes on location of this particular map unit within the state. Some state maps have differing lithologic descriptions for a single geologic unit in different geographic portions of the state. (String of width 60) |
| COMMENTS | Other information from the map explanation. (String of width 70) |
| MTCARB | Summary field used for symbolizing derivative maps. (String of width 3) |
| MTK | Summary field used for symbolizing derivative maps. (String of width 3) |
| MTBASE | Summary field used for symbolizing derivative maps. (String of width 3) |
| MTFAM | Summary field used for symbolizing derivative maps. (String of width 3) |
| MTPHOS | Summary field used for symbolizing derivative maps. (String of width 3) |
| MTSG | Summary field used for symbolizing derivative maps. (String of width 4) |
| MTBATHAB | Summary field used for symbolizing derivative maps. (String of width 10) |
| LITHA | Standardized lithologic description (some abbreviations) (String of width 20) |
| LITH_FORM | General geologic structure. (String of width 20) |
| LITH_MAJOR | Major lithology, expressed using combinations of standardized lithologic terms. (String of width 120) |
| LITH_MINOR | Minor lithology, expressed using combinations of standardized lithologic terms. (String of width 200) |
| LITHOLOGY | Lithology, expressed using combinations of standardized lithologic terms. (String of width 254) |
| AGE | Text combined from Era, System, and Series fields. (String of width 72) |
| MTLITH | Abbreviated lithology used for symbolization. (String of width 40) |