Online link | https://geo-nsdi.er.usgs.gov/metadata/open-file/01-262/metadata.faq.html |
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Description | The paper geologic map of the east part of the Pullman 1 x 2 -degree quadrangle, Idaho (Rember and Bennett, 1979) was scanned and initially attributed by Optronics Speciality Corp. Inc. (Northride, CA) and remitted to the U.S. Geological Survey for furte |
Originators | Rember, William C.; Bennett, Earl H.; and Kayser, Helen K. |
Publication | U.S. Geological Survey Open-File Report 01-262 |
The data files are in ASCII format. The gravity data define point data with information as follows: STATION NAME (a8): An alphanumeric combination of up to 8 characters used for station identification; LAT (f3.0,f6.3): Latitude in degrees and minutes, to 0.01 minute; LON (f4.0,f6.3): Longitude in degrees and minutes, to 0.01 minute; ELEV (f8.2): Elevation, to 0.1 ft; OG (f10.3): Observed gravity, to 0.01 mGal; FAA (f9.3): Free-air anomaly to 0.01 mGal; SBA (f8.3): Simple Bouguer anomaly to 0.01 mGal; ITC (f7.3): Inner terrain correction for a density of 2.67 g/cm3, to 0.01 mGal, followed by a letter denoting the extent of the correction. "Z" indicates computer terrain correction from the station out to 166.7 km with inner terrain correction out to D zone; TC (f7.3): Total terrain correction from the station to 166.7 km for a density of 2.67 g/cm3, to 0.01 mGal; TC CODE (a1): Letter denoting the extent of the correction, according to the Hayford-Bowie template (e.g. 'D' means 590 m); CBA (f8.3): Complete Bouguer anomaly reduced for a density of 2.67 g/cm3, to 0.01 mGal; ISO (f8.3): Isostatic residual anomaly values assuming an Airy model for isostatic compensation of topographic loads. This model assumes a crustal thick ness of 25 km, a topographic load density of 2.67 g/cm3, and a density contrast across the base of the model crust of 0.4 g/cm3; The density and susceptibility data define point data with information as follows: STATION NAME (a8): An alphanumeric combination of up to 8 characters used for station identification; LAT (f3.0,f6.3): Latitude in degrees and minutes, to 0.01 minute; LON (f4.0,f6.3): Longitude in degrees and minutes, to 0.01 minute; GRAIN DENSITY (f7.2): in grams per cubic centimeter; SATURATED BULK DENSITY (f6.2): in grams per cubic centimeter; DRY BULK DENSITY (f6.2): in grams per cubic centimeter; MAGNETIC SUSCEPTIBILITY (f7.2): in 10-3 cgs units; GEOLOGIC MAP UNIT (a10): An alphanumeric combination of up to 10 characters for corresponding geologic map unit when plotted on the 1:24,000 geologic map, see open-file report for map references; ROCK TYPE (a32): description of hand sample.
http://pubs.usgs.gov/of/2000/0193/pdf/of00-193.pdf