Geology topics
Alan A. Roberts
Publications and source records attributed to Alan A. Roberts.
A possible petroleum related helium anomaly in the soil gas, Boulder and Weld Counties, Colorado
A survey of the concentrations of helium in the soil gas conducted over a portion of the Denver Basin in Boulder and Weld Counties, Colorado, supports the existence of a potential petroleum prospect that was suggested by earlier geochemical analyses of the outcropping sandstones. The helium survey technique may prove to be a rapid, inexpensive, and valuable surface prospecting tool for detecting buried petroleum deposits.
Diurnal effects on the helium concentration in soil-gas and near-surface atmosphere
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Helium surveys over known geothermal resource areas in the Imperial Valley, California
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A precautionary note on the use of mixed solvents in soxhlet extraction procedures
The variation in solvent composition of a mixed solvent used in Soxhlet extraction of sediments has apparently often been overlooked. Owing to azeotropic distillation of the solvent introduced into the apparatus, care must be taken to determine the composition of the solvent actually doing the extracting.