North_america_terrain_2003_map.jpg
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Relief map showing the varying age of bedrock underlying North America .
This cartographic tapestry is woven from a geologic map and a shaded relief image. This 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 .
From most recent to oldest, age is indicated by: yellow, green, blue, red.
The fuchsia U-shape of the
Canadian Shield
is clearly apparent. The base of ancient
mountains
and
impact craters
, this mineral-rich rock is nearly bare due to recent
ice ages
.
The Canadian Shield is an exposed part of the
North American craton
, a stable area which extends down the continent along the blue areas, and includes the sweep east of the
Rocky Mountains
back northward along the pale yellows of the
Great Plains
, light green across
Wyoming
and nearly to
Alaska
.
Rock types
Four maps show the North American distribution of four principal types of rock : sedimentary , volcanic , plutonic and metamorphic rock .
Source
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 [1] archive copy at the Wayback Machine .
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.
English Wikipedia, original upload 15 April 2005 by SEWilco
Public domain Public domain false false |
This image is in the
public domain
in the United States because it only contains materials that originally came from the
United States Geological Survey
, an agency of the
United States Department of the Interior
. For more information, see
the official USGS copyright policy
.
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Annotations
InfoField
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This image is annotated: View the annotations at Commons |
Grönland fehlt / Greenland is missing