U.S. Geological Survey Open-File Report 2015-1153
SI to Inch/Pound
Vertical coordinate information is referenced to North American Vertical Datum of 1988 (NAVD 88).
Elevation, as used in this report, refers to distance above the vertical datum.
Horizontal coordinate information is referenced to the World Geodetic System of 1984 (WGS 84) in a Geographic Coordinate System
Particle size in phi units may be converted to millimeters (mm) as follows: mm=2-phi.