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The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad". A quadrangle is defined by north and south boundaries of constant latitude (which are not great circles so are curved), and by east and west boundaries of constant longitude. From approximately 1947–1992, the USGS produced the ...
Author: Pease, M.H., Jr., and Monroe, W.H. Image title: Geologic map of the San Juan quadrangle, Puerto Rico; Short title: USGS Miscellaneous Investigations Series ...
Today's U.S. Topo quadrangle (1:24,000) maps are mass-produced, using automated and semiautomated processes, with cartographic content supplied from the National GIS Database. [33] In the two years from June 2009 to May 2011, the USGS produced nearly 40,000 maps, more than 80 maps per work day. [33]
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).
Shaded relief map of the United States, showing 10 geological provinces. The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great mountain ranges while the forces of ...
Jahns, Richard Henry (1935), Geology of the Ravenna Quadrangle - bachelor's thesis, California Institute of Technology, pp. 1–41, doi:10.7907/K1PV-N521 Maps Yerkes, Robert F.; Campbell, Russell H. (2005), Preliminary Geologic Map of the Los Angeles 30' x 60' Quadrangle, Southern California , United States Geological Survey , p. 1
Geochronology is different in application from biostratigraphy, which is the science of assigning sedimentary rocks to a known geological period via describing, cataloging and comparing fossil floral and faunal assemblages.
"Geologic Map Of The Bach (H-15) Quadrangle Of Mercury" (PDF). Prepared for the National Aeronautics and Space Administration by the U.S. Department of the Interior, U.S. Geological Survey. (Published in hardcopy as USGS Miscellaneous Investigations Series Map I–2015, as part of the Atlas of Mercury, 1:5,000,000 Geologic Series.