Image:North america terrain 2003.jpg

The North America Tapestry of Time and Terrain (1:8,000,000 scale) is a product of the United States Geological Survey in the I-map series (I-2781). This map was prepared in collaboration with the Geological Survey of Canada and the Mexican Consejo Recursos de Minerales.

This cartographic tapestry is woven from a geologic map and a shaded relief image. This digital combination reveals the geologic history of North America through the interrelation of rock type, topography and time. Regional surface processes as well as continent-scale tectonic events are exposed in the three dimensions of space and the fourth dimension, geologic time. The large map shows the varying age of bedrock underlying North America, while four smaller maps show the distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic.

[edit] Related images

Four maps show the North American distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic.

Metamorphic rock

Plutonic rock

Sedimentary rock

Volcanic rock

There are separate images of the main map, time scale, and rock type maps.

North American terrain

Time scale

North American rock types

[edit] Source

This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy

Home: http://pubs.usgs.gov/imap/i2781/

Image: http://pubs.usgs.gov/imap/i2781/i2781_c_low.pdf 144 dpi, encoded to 72 dpi JPEG, compressed slightly to fit within Wikipedia 2MB limit.

Source: English Wikipedia, original upload 15 April 2005 by SEWilco

• User:SEWilco/Images
• Image:North america terrain 2003 map.jpg