Reset K-Ar ages suggest the Grand Canyon orogeny occurred about 830 m.y. ago, probably the time of formation of the Cordilleran miogeocline, and it is ... For each deposit, information is provided on the mineralogy, geologic setting, size, and grade of mercury ore bodies where known, and, for productive ... Ponding- test procedure for assessing the infiltration capacity of storm-water basins. ... Seismograph station codes and characteristics, by B. B. Poppe, D. A. Naab, and J. S. Derr.
|Title||:||Publications of the Geological Survey|