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April 1, 1998

Maps showing distribution of erosional clasts on the middle Jurassic J-2 unconformity in the western interior of the United States Maps showing distribution of erosional clasts on the middle Jurassic J-2 unconformity in the western interior of the United States

No abstract available.

January 1, 1998

Areas of historical oil and gas exploration and production in the conterminous United States Areas of historical oil and gas exploration and production in the conterminous United States

No abstract available.

January 1, 1998

Correlation of Jurassic San Rafael Group and related rocks from Blanding, Utah, to Dove Creek, Colorado Correlation of Jurassic San Rafael Group and related rocks from Blanding, Utah, to Dove Creek, Colorado

No abstract available.

January 1, 1998

Geologic map of part of the Tyrrhena Patera region of Mars (MTM Quadrangle-20252) Geologic map of part of the Tyrrhena Patera region of Mars (MTM Quadrangle-20252)

Mars Transverse Mercator (MTM) -20252 quadrangle contains the volcano Tyrrhena Patera, a low, broad structure that has summit depressions and is dissected by prominent radial channels (fig. 1). Tyrrhena Patera is surrounded by cratered plains materials on the western edge of Hesperia Planum, ~2,000 km northeast of the center of the Hellas basin (Greeley and Guest, 1987; U. S. Geological...

January 1, 1998

Geologic map of the Greer Quadrangle, Oregon County, Missouri Geologic map of the Greer Quadrangle, Oregon County, Missouri

No abstract available.

January 1, 1998

Geologic map of the western Ophir Planum region (MTM -10067) of Mars Geologic map of the western Ophir Planum region (MTM -10067) of Mars

The map area, in the Coprates 1:2,000,000-scale quadrangle MC-18 NW lies in the heart of the Valles Marineris trough system. The western part of Ophir Planum (36,660 km2) occupies 40 percent of the map areas; parts of Candor, Melas, and Coprates Chasmata make up the remainder. The troughs contain distinctive landslide deposits, normal faults, possible young volcanic rocks, and layered...