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Since geologic maps were first constructed in the late 18th and early 19th centuries, they have played a fundamental role in understanding the history of the Earth and providing the information needed to solve practical land-use problems. By Jack Reed. U.S. Geological Survey.
Jan 16, 2015 · In 1815, William Smith, an English canal surveyor and land drainer, provided the young science of geology with the first true geological map of an entire country (see the first figure).
- Tom Sharpe
- 2015
- Introduction
- Geologic Structures
- Geologic Maps
- Additional Information
Do you remember in Chapter 0 how we said you would become an expert at reading and interpreting geologic maps? Now is the time to sharpen this skill. In the past, you probably encountered a variety of types of maps. If you have used a mapping app to get directions somewhere, you have used a map. Maps are a scaled, 2-dimensional representation of th...
You already know that the Earth is a dynamic place and that plate tectonic forces bend and break rocks. You’ve already studied this subject in both Physical Geology text and labbooks. Here is a short review of some of the concepts you will need for this chapter and the next. Some students have an easy time visualizing in three dimensions. If you ha...
To make a geologic map, you need to use your geological skills to fill in the areas between data points, such as outcrops, stratigraphic sections, wells, soil profiles, etc. Often the data is imperfect and doesn’t cover 100% of the area in question. For example, figure 9.9 shows an outcrop map and two possible attempts at geological maps. One is ma...
Exercise Contributions
Virginia Sisson, Daniel Hauptvogel, Carlos Andrade, and Joshua Flores
References
Billingsley, G. H., 2000, Geologic Map of the Grand Canyon 30’ x 60’ Quadrangle, Coconino and Mohave counties, northwestern Arizona, U. S. Geological Survey, Geological Investigations I-2688 Map and Pamphlet. Public Domain Price, R.A., Cook, D.G., Aitken, J.D., and Mountjoy, E.W., 1980, Geology, Lake Louise (west half), west of fifth meridian, British Columbia-Alberta. Geological Survey of Canada, “A” Series Map 1483A, 1980, 2 sheets, https://doi.org/10.4095/108873(Open Access) Teixell, A., A...
The historical roots of land-cover mapping reside in the early history of aerial photography and applications spanning forestry, agriculture, urban planning, and water-resources management.
- Thomas R. Loveland
- 2012
- 10.1201/b11964-4
- History of land cover mapping
Nov 16, 2009 · Congress decided to transform the earlier system of sporadic federal geological explorations into a permanent government agency, the United States Geological Survey (USGS).
- Missy Sullivan
- 2 min
U.S. Geological Survey (USGS) Historical Topographic Map Collection (HTMC). The HTMC is a digital archive of about 190,000 printed topographic quadrangle maps published by the USGS from the inception of the topographic mapping program in 1884 until the last paper topographic map using lithographic printing technology was published in 2006. The
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May 2, 2014 · Today, the initial bench mark which began the datum at Sheridan has been determined by the National Geodetic Survey to be 12.110 feet higher (NAVD88) than originally thought by USGS. The early use of isolated datums by USGS mostly ended by 1910, but continued as late as 1920 in some areas.
