All Maps
Explore all USGS Maps and refine your search by type, topic, year, location, and advanced search.
Filter Total Items: 9586
Map showing changes in shoreline of Martha's Vineyard, Massachusetts, during the past 200 years Map showing changes in shoreline of Martha's Vineyard, Massachusetts, during the past 200 years
The history of the coast of Martha's Vineyard is mostly a story of erosion, although locally the shore has alternately advanced and retreated. Erosion of the island's shores has, in fact, been going on for thousands of years, and although we know little about the erosion of distant times, it is quite possible that the rate of erosion was about the same as now; about 16 acreas are lost to...
Map showing concentration of dissolved solids in water from the principal aquifer, Sugar House quadrangle, Salt Lake County, Utah Map showing concentration of dissolved solids in water from the principal aquifer, Sugar House quadrangle, Salt Lake County, Utah
The concentration of dissolved solids in water from the principal aquifer ranges from about 100 mg/l (milligrams per liter) to as much as 800 mg/l. Water containing the least dissolved solids occurs in an arcuate, mile-wide band along the southern border of the Sugar House quadrangle. Water containing the most dissolved solids occurs in a 3½-mile–wide band in the northern part of the...