Version history for


  McLaughlin, R.J., Sarna-Wojcicki, A.M., Fleck, R.J., 
       Wright, W.H., Levin, V.R.G., and Valin, Z.C., 2004, 
       Geology, tephrochronology, radiometric ages, and 
       cross sections of the Mark West Springs 7.5' 
       quadrangle, Sonoma and Napa Counties, California: 
       U.S. Geological Survey Scientific Investigations Map 
       2858, scale 1:24,000, 16 p. [available on the World 
       Wide Web at http://pubs.usgs.gov/sim/2004/2858 ].



  Version 1.0, November 29, 2004

  Intital release online at
  http://pubs.usgs.gov/sim/2004/2858/