Combined Thickness of the Modeled Wanapum Basalt and Vantage-Latah Interbed Geomodel Units (wnthk_f)
The wnthk_f grid represents the modeled combined thickness of the Wanapum Basalt and the 
Vantage/Latah interbed geomodel units at a 500 foot resolution. It is one grid of a geomodel that 
consists of eleven grids and a spatial extent polygon shapefile.  As part of a U.S. Geological 
Survey Groundwater Resources …