Digital representation of the Montana state geologic map in ARC/INFO export format.

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

Related topics

States or counties

EMTARCS.AAT

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

EMTGEOL.PAT

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.

EMTGEOL.AAT

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

EMTGEOL.PAT

Geology of eastern Montana at specific locations (same attributes as polygon coverage EMTGEOL.PAT)

Label Definition

WMTARCS.AAT

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

WMTGEOL.PAT

Geology of western Montana

Label Definition
FORMATION Geolgic formation (no descriptions of map units found)

WMTGEOL.AAT

Linear geologic features of western Montana (same attributes as arc coverage EMTGEOL.AAT)

Label Definition

WMTGEOL.PAT

Geology of western Montana at specific locations (same attributes as polygon coverage WMTGEOL.PAT)

Label Definition

wmtgeol.tbl or emtgeol.tbl

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)