Williams, Van S.

About the author


Preliminary geologic map of the Mesquite quadrangle, Clark and Lincoln Counties, Nevada and Mohave County, Arizona

Original geologic data mapped by the author in 1995 and 1996 with emphasis on structures in Miocene basin-fill deposits of the Muddy Creek Formation that may control availability and quality of groundwater.

Geologic Map of the Ennis 30 X 60 minute quadrangle, Madison and Gallatin counties, Montana

Geologic map of the Ennis 30x60 minute quadrangle, Gallatin and Madison Counties, Montana

Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming

The Ennis 1:100,000 quadrangle lies within both the Laramide (Late Cretaceous to early Tertiary) foreland province of southwestern Montana and the northeastern margin of the middle to late Tertiary Basin and Range province. The oldest rocks in the quadran

Digital Geologic Map of the Nevada Test Site and Vicinity, Nye, Lincoln, and Clark Counties, Nevada, and Inyo County, California

This digital geologic map of the Nevada Test Site (NTS) and vicinity, as well as its accompanying digital geophysical maps, are compiled at 1:100,000 scale. The map compilation presents new polygon (geologic map unit contacts), line (fault, fold axis, me