USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
Rowley, Peter D. , Cunningham, Charles G. , Steven, Thomas A. , Workman, Jeremiah B. , Anderson, John J. , and Theissen, Kevin M. , 2002, Geologic Map of the Central Marysvale Volcanic Field, Southwestern Utah: U.S. Geological Survey Geologic Investigations Series I-2645-A, U. S. Geological Survey, Denver, Colorado.Online Links:
This is a vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 2.5
Ordinates (y-coordinates) are specified to the nearest 2.5
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
POLYGON ATTRIBUTES: UNIT#--Integer attribute for rock unit (see table below); UNIT--Character attribute for rock unit from text (see table below); SYMBOL--Integer attribute for polygon shade symbol (see table below). ARC ATTRIBUTES: CODE--Integer attribute for line type (see table below); SYMBOL--Integer attribute for line symbol (see table below); DESCRIPTION--Character attribute for line type description (see table below).MV-FLT
ARC ATTRIBUTES: CODE--Integer attribute for line type (see table below); SYMBOL--Integer attribute for line symbol (see table below); DESCRIPTION--Character attribute for line type description (see table below).MV-ATT
POINT ATTRIBUTES: CODE--Integer attribute for line type (see table below); DESCRIPTION--Character attribute for line type description (see table below); AZIMUTH--Integer attribute for bedding attitude strike azimuth (clockwise from north); DIP--Integer attribute for bedding attitude dip value. ARC ATTRIBUTES: CODE--Integer attribute for line type (see table below); SYMBOL--Integer attribute for line symbol (see table below); DESCRIPTION--Character attribute for line type description (see table below).MV-SYM
POINT ATTRIBUTES: CODE--Integer attribute for line type (see table below); DESCRIPTION--Character attribute for line type description (see table below); AZIMUTH--Integer attribute for orientation of symbol (clockwise from north); ARC ATTRIBUTES: CODE--Integer attribute for line type (see table below); SYMBOL--Integer attribute for line symbol (see table below); DESCRIPTION--Character attribute for line type description (see table below).MV-XS
POINT ATTRIBUTES: TEXT--Character attribute for text to be posted; ARC ATTRIBUTES: CODE--Integer attribute for line type (see table below); SYMBOL--Integer attribute for line symbol (see table below); DESCRIPTION--Character attribute for line type description (see table below).*************************************************************************
303-236-1257 (voice)
jworkman@usgs.gov
This database was developed to improve upon previous mapping in the central Marysvale volcanic field and compile older mapping at a consistent scale. This area is an important mining district, and a regional understanding of the geology and mineral deposits will assist in understanding genesis of deposits and in exploration for new deposits. The area is also an important part of the transition zone between the Colorado Plateau to the east and the Great Basin to the west. This tectonically significant province may hold keys to the style and mechanisms of continent-scale deformation in the Western United States.
Williams, Van S., 1996, GSMCAD, a new computer program that combines the functions of the GSMAP and GSEDIT programs and is compatible with Microsoft Windows and ARC/INFO: U. S. Geological Survey Open-File Report 96-007.
Campbell, David L. , Steven, Thomas A. , Cunningham, Charles G. , and Rowley, Peter D. , 1999, Aeromagnetic and Gravity Maps of the Central Marysvale Volcanic Field, Southwestern Utah: U.S. Geological Survey Geologic Investigations Series I-2645-B, U.S. Geological Survey, Denver, CO.Online Links:
The database was digitized in GSMCAD (Williams, 1996), which does not allow unattributed lines so there are no unlabeled lines in the database. Frequency tests were run on the lines and polygon labels to ensure that no arcs or polygons are unlabeled. The attributes have been checked by the authors for agreement with field maps, annotated aerial photographs, and preliminary drafted versions of the map. The attribute data in the data set should be taken as an accurate representation of the authors' geologic interpretations.
The estimated horizontal positional accuracy of the data is 15 meters. Mapping at 1:24,000-scale (1:50,000-scale in the northwest corner of the map area) was generalized to 1:100,000-scale. All linework was digitized at 1:24,000-scale by using a CalComp digitizing table (model 95482) having an error of +/-0.001 inches (< 1 meter at map scale). This database was produced to be used at 1:100,000-scale and any problems arising from use at other scales are not the responsibilities of the authors. No vertical data are included in the database.
This dataset includes only the coverages pertaining to the geologic map. Supplemental text and illustrations on the printed map (correlation chart, explanation of map symbols, cross-section) are not included. This map was produced to be used at 1:100,000-scale. Any geologic features too small to be shown at this scale have been omitted or generalized if they are of significant importance. The smallest objects are approximately 40 meters on a side.
The entire study area was mapped both by photo-interpretation and by extensive field work at 1:50,000- and 1:24,000-scale over the course of several decades. The entire map area was mapped at the same level of detail. All linework was digitized at 1:24,000-scale, except for parts of the northwestern corner of the map, which were digitized at 1:50,000-scale, and edits were made, adjoining quads edge-matched and snapped, and attributes were added using GSMCAD (Williams, 1996). All lines were visually inspected by the authors for proper intersections, repetition, overshoots, undershoots, and overall logical consistency. The geologic features in the map area are all described, in the view of the authors, at a consistent scale of 1:100,000. All coverages were cleaned and built in ARC/INFO (version 7.1.2) to ensure a logical consistency that is topologically clean.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
303-236-5486 (voice)
Geologic Investigation Series I-2645-A, "Geologic Map of the Central Marysvale Volcanic Field, Southwestern Utah"
Although these digital spatial data have been subjected to rigorous review and are substantially complete, they are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from their authorized or unauthorized use.
Data format: | Geologic units and structural features in format ArcInfo Export (version 7.2.1) |
---|---|
Network links: |
<http://pubs.usgs.gov/imap/i-2645-a/i-2645-a.tar.gz> |
Data format: | Geologic units and structural features in format Shapefile (version 1.0) |
---|---|
Network links: |
<http://pubs.usgs.gov/imap/i-2645-a/i-2645-a.tar.gz> |
1-888-ASK-USGS (voice)
USGS Geologic Investigation Series I-2645-A
None
Available as folded map, printed on a four-color press; order from USGS at address listed above.
303-236-1257 (voice)
jworkman@usgs.gov