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January 1, 1973

Geologic map of the Petavius quadrangle of the Moon

The large crater Petavius, about 180 km in diameter, is the dominant geologic feature within this quadrangle at the southeast border of Mare Fecunditatis on the east limb of the near side. Four categories of materials have been distinguished herein: (1) terrae, with rugged to gently rolling topography and moderate albedo; (2) plains, of low relief and moderate albedo; (3) craters, with low to rugg

January 1, 1973

Geologic map of the Phosphate Reserve in the Lander area, Fremont County, Wyoming

The area was mapped as part of the U.S. Geological Survey program of classifying and evaluating lands in the public domain. Resources of economic interest in the map area include oil, gas, water, phosphate rock, gypsum, and analcime. The area mapped includes the rocks between the Tensleep Sandstone and the Morrison Formation and Tertiary and Quaternary deposits.

January 1, 1973

Geologic map of the Pilot Peak Quadrangle, Park County, Wyoming

No abstract available.

January 1, 1973

Geologic map of the Rio Descalabrado Quadrangle, Puerto Rico

No abstract available.

January 1, 1973

Geologic map of the Rumker Quadrangle of the Moon

The Rumker quadrangle, in the northwest quadrant of the Moon, is adjacent to the western rim of the multi-ring Imbrium basin and to Sinus Iridum, a large (220 km diameter) mare-filled crater. Both of these great depressions were probably formed by impact, as indicated here and elsewhere on the Moon by the characteristic form, distribution, and texture of surrounding materials and structures. The I

January 1, 1973