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Map Showing Areas Containing Swelling Clay in the Morrison Quadrangle, Jefferson County, Colorado Map Showing Areas Containing Swelling Clay in the Morrison Quadrangle, Jefferson County, Colorado
Formations that contain clays having swelling pressures higher than 2,500 pounds per square foot (as measured by the Potential Volume Change meter) are listed in order of decreasing swelling pressure: Denver Formation, Pierre Shale, Laramie Formation, Green Mountain Conglomerate, Fox Hills Sandstone, and Arapahoe Formation. Some landslides derived from these formations also contain...
Map showing drainage basins and historic cloudburst floods in the Salina quadrangle, Utah Map showing drainage basins and historic cloudburst floods in the Salina quadrangle, Utah
In the Salina quadrangle, as in most of the arid West, summer precipitation commonly occurs as thunderstorms. Suring these storms, rain falls as a torrential downpour, or cloudburst, in a local area. An inch of rain or more may fall in half an hour; U.S. Weather Bureau records show that o.4 inch of rain has fallen in a period of 5 minutes (Woolley, 1946). Such a fall of water far exceeds...