Arizona Geological Survey Posts - TopicsExpress

A GEOLOGICAL VISIT TO A VALLEY ON THE MOON by Senator and former
A GEOLOGICAL VISIT TO A VALLEY ON THE MOON by Senator and former astronaut Harrison H. Schmitt. Free lecture, Oct. 7 2014; 8-9pm; Sheraton Tucson Hot...

1783 - Year without a summer! A constant fog veiled much of
1783 - Year without a summer! A constant fog veiled much of Europe and northern North America in the summer of 1783. Then U.S. ambassador to France, B...

NEW USGS product - Karst & Pseudokarst in the U.S.A. Karst
NEW USGS product - Karst & Pseudokarst in the U.S.A. Karst landscapes typically form where soluble bedrock (limestone, rock salt) occur in the subsur...

North American Tapestry of Time & Terrain - Map product,
North American Tapestry of Time & Terrain - Map product, tapestry.usgs.gov/ From the portal page, This cartographic Tapestry is woven from a geologic...