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Geology topics

Ralph Jackson Roberts

Publications and source records attributed to Ralph Jackson Roberts.

30 records · Page 2Linked to original sources
USGS1957

Mineral deposits of Central America, with a section on manganese deposits of Panama

The mineral deposits of Central America were studied between 1942 and 1945, in cooperation with the United States Department of State and the Foreign Economic Administration. Emphasis was originally placed on the study of strategic-mineral deposits, especially of antimony, chromite, manganese, quartz, and mica, but deposits of other minerals that offered promise of significant future production were also studied. A brief appraisal of the base-metal deposits was made, and deposits of iron ore in Honduras and of lead and zinc ores in Guatemala were mapped. In addition, studies were made of the regional geology of some areas, data were collected from many sources, and a new map of the geology of Central America was compiled.

Central America↗
USGS1949

Geology of the Antler Peak quadrangle, Nevada

The Antler Peak quadrangle is bounded by the meridians 117° and 117°15' and the parallels 140°30' and 40°45', in north-central Nevada. It is in the Basin and Range province and includes Battle Mountain, a north-trending range 18 miles long and 114 miles wide. The range is bounded on the east by the Reese River Valley, on the northeast by the Humboldt Valley, on the west by the Buffalo Valley, and on the south by a low divide separating the Buffalo Valley from the Reese River Valley. Altitudes in the quadrangle range from 4,475 to 8,550 feet; the local relief is as much as 3,500 feet, but is generally less than 2,000 feet.

Nevada↗