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Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska
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Frequently anticipated questions:
Surficial geologic map along the Castle Mountain fault
between Houston and Hatcher Pass Road, Alaska
This two coverage dataset makes up a 1:25,000 scale
surficial geologic map along the Castle Mountain fault
between Houston and Hatcher Pass Road in southcentral
Alaska. The map area lies entirely within the Anchorage
quadrangle and within the Matanuska-Susitna Borough. The
primary purpose of the map is to delineate the location
of the Castle Mountain fault and other active or
potentially active faults in the area. This map lies
between two other maps along the Castle Mountain fault
by Detterman and others (1974, 1976).
- How might this data set be cited?
Peter Haeussler, U.S. Geological Survey, 1998, Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska: U.S. Geological Survey Open-File Report 98-480, U.S. Geological Survey, Anchorage, Alaska.
- What geographic area does the data set cover?
- West_Bounding_Coordinate: -149.9
- East_Bounding_Coordinate: -149.2
- North_Bounding_Coordinate: 61.75
- South_Bounding_Coordinate: 61.5
- What does it look like?
- cmfmaplowres.gif (GIF)
GIF89a image of published map; 300x362 pixels, 72dpi,
256 colors, 44K
- Does the data set describe conditions during a particular time period?
- Calendar_Date: 1998
- Currentness_Reference: publication date
- What is the general form of this data set?
- Geospatial_Data_Presentation_Form: map
- How does the data set represent geographic features?
- How are geographic features stored in the data set?
This is a Vector data set.
- What coordinate system is used to represent geographic features?
Planar coordinates are encoded using coordinate pair
- Grid_Coordinate_System_Name: Universal Transverse Mercator
- UTM_Zone_Number: 6
- Scale_Factor_at_Central_Meridian: 0.9996
- Longitude_of_Central_Meridian: -147.0
- Latitude_of_Projection_Origin: 0.0
- False_Easting: 500000
- False_Northing: 0.0
Abscissae (x-coordinates) are specified to the nearest 20
Ordinates (y-coordinates) are specified to the nearest 20
Planar coordinates are specified in meters
- How does the data set describe geographic features?
'Unit' is a numeric item in the polgon attribute table for
coverages east and west. The attributes have the following
1 Qp Peat deposits (Holocene)
2 Qg Basal drift of Elemendorf advance (Pleistocene)
3 Qac Abandoned river channel deposits (Holocene or Pleistocene)
4 Qc Undifferentiated colluvium (Holocene)
5 Qgb Thin drift of Elmendorf advance (Pleistocene)
6 Qad Ancient drainage deposits of Elmendorf advance (Pleistocene)
7 Qat Alluvium in river terraces (Holocene or Pleistocene)
8 Qaa Alluvium along rivers (Holocene)
9 Qml Lateral moraine of Elmendorf advance (Pleistocene)
10 Qas Undifferentiated colluvium and alluvium (Holocene)
11 Qk Kame terrace deposits of Elmendorf advance (Pleistocene)
12 Qg2 Drift of pre-Elmendorf advances (Pleistocene)
13 Qat2 Alluvium in paleodrainage (Holocene or Pleistocene)
15 Qam Alluvium along small meandering streams (Holocene)
16 Qls Landslide deposits (Holocene)
17 Qe Esker deposits of Elmendorf advance (Pleistocene)
99 w water
The arc attribute tables for the coverages east and west have
a numeric item named 'code', which has the following
3 contact, approximately located
9 water boundary
The arc attribute tables for coverages fault_e and fault_2
have a numeric item named 'code', which has the following
2 fault, possible location
3 fault, approximate location
4 fault, concealed
5 fault, probable location
6 limit of aerial photograph coverage
7 lineation, probably reflecting bedding in underlying bedrock
For complete description of attributes, see
Haeussler, P.J., 1998, Surficial geologic map along the
Castle Mountain fault between Houston and Hatcher Pass
Road, Alaska: U.S. Geological Survey Open-File Report
- Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
- Peter Haeussler, U.S. Geological Survey
- Who also contributed to the data set?
Peter Haeussler, Nathan Pannkuk (Raytheon STX contractor),
H. Wilmer (ECO contractor); U.S. Geological Survey,
4200 University Drive, Anchorage, AK 99508-4667
- To whom should users address questions about the data?
U.S. Geological Survey
4200 University Drive
This map was designed to delineate the location of the Castle
Mountain fault and other active or potentially active faults
in the area. Nonetheless, the surficial geologic map may be
used for generic purposes.
- From what previous works were the data drawn?
- How were the data generated, processed, and modified?
- Date: 1998 (process 1 of 2)
Linework was captured by hand digitizing from paper
maps and mylar overlays. The linework was edited and
attributed using ARC/INFO. The coverage was cleaned,
built for polygons, and had labels created and attributed.
For the purpose of distribution, the coverages have been
converted to interchange format files using the ARC/Info
- Date: 28-Oct-1998 (process 2 of 2)
Creation of original metadata record
Person who carried out this activity:
US Geological Survey Minerals Resource Program - Alaska Section
4200 University Drive
- What similar or related data should the user be aware of?
- How well have the observations been checked?
The linework was digitized from a paper copy of 1:25,000
scale field maps. The linework was derived from field
work and aerial photograpic interpretation. The aerial
photographs were taken on March 29, 1986 and working
copies were printed at a scale of 1" to 1500 feet or
1:18,000. Aerial photo interpretations were drawn on
mylar overlays and then transferered to 1:25,000
Geologic contacts are generally accurate to within 30
meters, and most fault locations are accurate to 10 meters,
except the Lost-in-the-woods fault, which is located to
approximately 100 meters, where dashed and dotted.
The topographic base is a raster layer and obtained by
scanning the culture separation of the 1:25,000
topographic base at 300 dpi.
- How accurate are the geographic locations?
Users of this digital geologic map should respect the
intentions of the originators and the limitations of the
map. This coverage is intended to be used at a scale of
1:25,000; it is not intended to be used as a more detailed
scale. The geologic contacts are generally accurate
to within 30 meters, and most fault locations are accurate
to 10 meters except the Lost-in-the woods fault, which is
located to approximately 100 meters.
- How accurate are the heights or depths?
- Where are the gaps in the data? What is missing?
The data sets contain information appropriate for a
1:25,000 scale surficial geologic map.
- How consistent are the relationships among the observations, including topology?
The map area is covered by two sets of coverages, 'east' and
'west'. Each area has a net coverage containing information
about the geologic units ('unit') and their boundaries
("code"). For each area there is an additional coverage
containing fault information. Dangling arcs are present.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
Acknowledgement of the U.S. Geological Survey would be
appreciated in products derived from these data.
- Who distributes the data set? (Distributor 1 of 1)
USGS Information Services
Denver Federal Center
- What's the catalog number I need to order this data set?
- What legal disclaimers am I supposed to read?
This digital publication was prepared by an agency of the
United States Government. Neither the United States
Government nor the agency thereof nor any of their employees
make any warranty, expressed or implied, or assumes any legal
liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed in this report or represents that its use would not
infringe privately owned rights. Reference therein to any
specific commercial product, manufacturer, or otherwise does
not necessarily constitute or imply its endorsement,
recommendation, or favoring by the United States Government or
any agency thereof.
Although this data has been used by the USGS, no warranty,
expressed or implied, is made by the USGS as to the accuracy
of the data and related materials and/or the functioning of
the software. The act of distribution shall not constitute
any such warranty, and no responsibility is assumed by the
USGS in the use of these data, software, or related materials.
- How can I download or order the data?
- Availability in digital form:
- Cost to order the data: none
- Last modified: 23-Feb-2015
- Metadata author:
Peter N Schweitzer
USGS Midwest Area
Mail Stop 954
12201 Sunrise Valley Dr
- Metadata standard:
- FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <http://geo-nsdi.er.usgs.gov/metadata/open-file/98-480/metadata.faq.html>
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