Murphy Ridge, Utah - 7.5 Minute Series Topo Map GRAND STAIRCASE-ESCALANTE ABSTRACT The drilling of seven

ABSTRACT The drilling of seven core holes by the Utah Geological and Mineral Survey was done under contract with the United States Geological Survey

Updates to photography—showing more technology and diversity of participants

cross sections

57 billion years ago

Comprehensive information about Douglass Dinosaur Quarry

Murphy Ridge, Utah - 7.5 Minute Series Topo Map GRAND STAIRCASE-ESCALANTE ABSTRACT The drilling of sevenThe distinctive characteristic of a topographic map is that the shape of the Earth's surface is shown by contour lines. Contours are imaginary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steepness of slopes. A topographic map shows more than contours. The map also includes