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Geology of North America
Credit:
United States Geological Survey
Cartographic relief depiction
showing the varying age of
bedrock
underlying
North America
. This image combines 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 color: yellow, green, blue, red.
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