A rectangular area bounded by parallels of latitude and meridians of longitude. In this database, “quadrangle” means a USGS 7.5-minute topographic quadrangle map, 1:24,000 scale.
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Glossary
Quadrangle
Quartz
A very common rock-forming mineral consisting of silicon dioxide.
Quartzite
A granular metamorphic rock derived from sandstone and consisting of interlocking grains of quartz.