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At least 793 records · Page 44Linked to original sources
USGS2015

Geologic map of the Montauk quadrangle, Dent, Texas, and Shannon Counties, Missouri

The Montauk 7.5-minute quadrangle is located in south-central Missouri within the Salem Plateau region of the Ozark Plateaus physiographic province. About 2,000 feet (ft) of flat-lying to gently dipping lower Paleozoic sedimentary rocks, mostly dolomite, chert, sandstone, and orthoquartzite, overlie Mesoproterozoic igneous basement rocks. Unconsolidated residuum, colluvium, terrace deposits, and alluvium overlie the sedimentary rocks. Numerous karst features, such as caves, springs, and sinkholes, have formed in the carbonate rocks. Many streams are spring fed. The topography is a dissected karst plain with elevations ranging from approximately 830 ft where the Current River exits the middle-eastern edge of the quadrangle to about 1,320 ft in sec. 16, T. 31 N., R. 7 W., in the southwestern part of the quadrangle. The most prominent physiographic features within the quadrangle are the deeply incised valleys of the Current River and its major tributaries located in the center of the map area. The Montauk quadrangle is named for Montauk Springs, a cluster of several springs that resurge in sec. 22, T. 32 N., R. 7 W. These springs supply clean, cold water for the Montauk Fish Hatchery, and the addition of their flow to that of Pigeon Creek produces the headwaters of the Current River, the centerpiece of the Ozark National Scenic Riverways park. Most of the land in the quadrangle is privately owned and used primarily for grazing cattle and horses and growing timber. A smaller portion of the land within the quadrangle is publicly owned by either Montauk State Park or the Ozark National Scenic Riverways (National Park Service). Geologic mapping for this investigation was conducted in 2007 and 2009.

Texas↗
USGS1977

Geologic map of the Arabia Quadrangle of Mars

The Arabia quadrangle is located in the northern hemisphere of Mars; it extends 30 ˚ N. from the equator and 45˚ E. from the prime meridian. It is within the area of unmantled terrain defined by Soberblom and others (1973) and the planet-encircling band of old cratered deposits shown on the preliminary geologic map o f Mars ( Carr and others, 1973). Crater density in the Arabia quadrangle is similar to the heavily cratered regions located south of the equator owing to inclination of the great circle division between heavily and less cratered Martian terrains ( Soberblom and others (1974). Non e of the large prominent telescopically defined Martian surface markings dominate the Arabia quadrangle, although the northern tip of Meridiani Sinus projects slightly into the extreme southwest corner. The topographic map of Mars (U. S. Geol. Survey, 1976) indicates that elevations in the Araba quadrangle rise toward the northeast. The entire region lacks high relief.

IMAP↗