The following report summarizes the geological and geophysical studies made on the rocks of the Midi Mist site in the Area-12 tunnel complex of the Nevada Test Site. The data was needed to determine whether the rock met the technical criteria of the nuclear experiment.

Abstract: "Fifteen in situ interval densities were calculated from the borehole gravity meter observations made in Test Well-B. The weighted average density for all the rocks sampled by the gravity meter is 1.83 gm/cc. The alluvium density ranges from 1.71 to 1.82 gm/cc and averages 1.76 gm/cc. The lake beds range from 1.91 to 1.93 gm/cc and average 1.92 gm/cc. The Rainier Mesa Member averages 1.83 gm/cc. The Tiva Canyon Member averages 1.74 gm/cc and the upper 110 feet of Topopah Spring Member has a density of 2.30 gm/cc."

The accompanying map shows the results of an airborne radioactivity survey in an area of 800 square miles in Campbell and Johnson Counties, Wyoming.

Photogeologic map of the Orange Cliffs-1 quadrangle, Wayne and San Juan counties, Utah

Aerial image shows the result of an airborne radioactive survey over an area of 65 square miles in the vicinity of Miller Hill, Carbon County, Wyoming with the approximate location of eleven radioactivity anomalies found. Text describes methods used and discusses the anomalies.

Photogeologic map of the Orange Cliffs-4 quadrangle, Wayne County, Utah