GEOLOGY - Note that the maps are "as is" with no attempt at this time to color units -- the sequence is:
Rhyolite [yellow]
(Youngest) Ellison [above the blue line]
Homestake [between brown line and blue line]
Poorman [between mauve and brown line] Ross Member
(Oldest) Yates Member of Poorman Fm [mauve color]
files are labeled as the distance below the surface (Yates Shaft collar)