Ground-magnetic studies of the Amargosa desert region, California and Nevada

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Blakely, Richard J., Hillhouse, John W., and Morin, Robert L., 2005, Ground-magnetic studies of the Amargosa desert region, California and Nevada: Open-File Report 2005-1132, Geological Survey (U.S.), Menlo Park, California.

   Online Links:

   • http://pubs.usgs.gov/of/2005/1132/

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -116.862633
   East_Bounding_Coordinate: -116.272033
   North_Bounding_Coordinate: 36.502867
   South_Bounding_Coordinate: 36.313817
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 2002

   Currentness_Reference:

   ground condition

5. What is the general form of this data set?

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Entity point (33)
   2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is World Geodetic System 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
      
7. How does the data set describe geographic features?

   2005-1132.dbf

   Magnetic susceptibility measurements in the Amargosa Desert region

   SITE

   Site identification Textual identifier without substantial scientific significance

   LATITUDE

   Geographic latitude

   Range of values
   Minimum:	36.3138170
   Maximum:	36.5028670
   Units:	decimal degrees

   LONGITUDE

   Geographic longitude

   Range of values
   Minimum:	-116.8626330
   Maximum:	-116.2720330
   Units:	decimal degrees

   MEAN

   Average magnetic susceptibility measurement at the site

   Range of values
   Minimum:	0.0050
   Maximum:	1.7300

   SD

   Standard deviation of magnetic susceptibility measurements at the site

   Range of values
   Minimum:	0.0000
   Maximum:	0.7390

   N

   Number of magnetic susceptibility measurements at the site

   Range of values
   Minimum:	4
   Maximum:	12
   Units:	observations

   COMMENT

   Description of the local rocks at the site

   Value	Definition
   Calcareous spring deposit
   Calcite cemented conglomerate; volcanic and metasedimentary clasts (see Fig. 8)
   Calcite crack fillings; iron stained (see Fig. 11)
   Caliche rubble
   Clayey siltstone
   Cobbles on desert pavement
   Dolomite at Devils Hole
   Dried mud
   Fanglomerate cobbles; calcium-carbonate cemented
   Fanglomerate next to calcite-filled cracks
   Fanglomerate; above tuffaceous bed
   Fanglomerate; Furnace Creek Formation
   Fanglomerate; Furnace Creek Formationgraphical
   Fine sandstone, tuffaceous(?), white
   Pebbles on sand
   Pebbly deposit on playa
   Pebbly matrix
   Pebbly surface
   Scraped surface; calcium carbonate deposit
   Siltstone
   Siltstone with calcite nodules
   Siltstone, Furnace Creek Formation
   Siltstone, laminated
   Siltstone, laminated, tuffaceous
   Siltstone, white, resistant
   Siltstone; laminated, green-white
   Siltstone; white and gray
   Siltstone; white and tan
   White siltstone in road bed

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Blakely, Richard J.
   • Hillhouse, John W.
   • Morin, Robert L.
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   Richard J Blakely

   USGS WR SW GD

   345 Middlefield Road

   Mail Stop 989

   Menlo Park, CA
   

   USA

   650-329-5316 (voice)

   650-329-5133 (FAX)

   blakely@usgs.gov

Why was the data set created?

Provide ground-truth information for magnetic anomaly studies designed to determine the cause of low-amplitude aeromagnetic anomalies over Quaternary alluvial deposits in the study area.

How was the data set created?

1. From what previous works were the data drawn?
2. How were the data generated, processed, and modified?
3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: none
Use_Constraints: none

1. Who distributes the data set? (Distributor 1 of 1)
   
   USGS Information Services

   Box 25286, Denver Federal Center

   Denver, Colorado
   

   USA

   1-888-ASK-USGS (voice)

   1-303-202-4695 (FAX)

   infoservices@usgs.gov
2. What's the catalog number I need to order this data set? USGS Open-File Report 2005-1123
3. What legal disclaimers am I supposed to read?

   This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Ground magnetic anomaly station data in format Shapefile (version 1.0)
     Network links:	http://pubs.usgs.gov/of/2005/1132/data/2005-1132.zip

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 10-Jun-2016

Metadata author:

Peter N Schweitzer

USGS Midwest Area

Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/

Mail Stop 954

12201 Sunrise Valley Dr

Reston, VA

USA

703-648-6533 (voice)

703-648-6252 (FAX)

pschweitzer@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)