National Geographic

To read about how one scientist is using maps and mapping technology to map the human footprint, go to the National Geographic Expedition on page 892.

Geologic Maps

A useful tool for a geologist is a geologic map. A geologic map is used to show the distribution, arrangement, and type of rocks located below the soil. A geologic map can also show features such as fault lines, bedrock, and geologic formations.

Using the information contained on a geologic map, combined with data from visible rock formations, geologists can infer how rocks might look below Earth's surface. They can also gather information about geologic trends, based on the type and distribution of rock shown on the map.

Geologic maps are most often superimposed over topographic maps and color coded by type of rock formation, as shown in Figure 2.10. Each color corresponds to the type of bedrock present in a given area. There are also symbols that represent mineral deposits and other structural features. Refer to Table 2.1 on the following page to compare geologic maps to the other maps you have learned about in this chapter.

Figure 2.10 Geologic maps show the distribution of surface geologic features. Notice the abundance of Older Precambrian rock formations.

Geologic Map of Grand Canyon

Geologic Map of Grand Canyon

Figure 2.10 Geologic maps show the distribution of surface geologic features. Notice the abundance of Older Precambrian rock formations.

Geological Map The Grand Canyon

QUATERNARY PENNSYLVANIAN

s Landslides and rockfalls ps Supai Formation ^n River sediment

PERMIAN

Kaibab Limestone i Toroweap Formation Pc Coconino Sandstone EPQ Hermit Shale Pe Esplanade Sandstone

MISSISSIPPIAN Mr Redwall Limestone

DEVONIAN

[ Db Temple Butte Limestone

CAMBRIAN cm Muav Limestone cba Bright Angel Shale ct Tapeats Sandstone

YOUNGER PRECAMBRIAN pci Diabase sills and dikes pcs Shinumo Quartzite pch Hakatai Shale pcb Bass Formation

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Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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