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Age of the bedrock underlying North America, from red (oldest) to blue, green, yellow (newest). Seventy percent of North America is underlain by the Laurentia craton, [5] which is exposed as the Canadian Shield in much of central and eastern Canada around the Hudson Bay, and as far south as the U.S. states of Michigan, Wisconsin, and Minnesota.
In North America, vegetation types are based on a combination of the following criteria: climate pattern, ... Interactive world vegetation map by Howstuffworks;
A map of North America's physical, political, and population characteristics as of 2018. North America is a continent [b] in the Northern and Western Hemispheres. [c] North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean.
Flora of North America North of Mexico. 12+ vols. New York and Oxford, 1993+. The PLANTS Database @ United States Department of Agriculture; NatureServe Explorer Archived 2010-01-10 at the Wayback Machine
Map of oak savanna distribution in North America. Although there are pockets of oak savanna almost anywhere in North America where oaks are present, there are three major oak savanna areas: 1) California, British Columbia, Washington and Oregon in the west; 2) Southwestern United States and northern Mexico; and 3) the prairie/forest border zone of the Midwestern United States.
The Flora of North America North of Mexico (usually referred to as FNA) is a multivolume work describing the native plants and naturalized plants of North America, including the United States, Canada, St. Pierre and Miquelon, and Greenland. It includes bryophytes and vascular plants.
The Tundra of North America is a Level I ecoregion of North America designated by the Commission for Environmental Cooperation (CEC) in its North American Environmental Atlas. One of the planet's most recent biomes , a result of the last ice age only 10,000 years ago, the tundra contains unique flora and fauna formed during the last glaciation ...
Ecoregions may be identified by similarities in geology, physiography, vegetation, climate soils, land use, wildlife distributions, and hydrology. The classification system has four levels. Only the first three levels are shown on this list. "Level I" divides North America into 15 broad ecoregions.