Saint Lawrence River and Seaway — ▪ river, North America Introduction hydrographic system of east central North America. It connects the North River (source of the St. Louis River, in the U.S. state of Minnesota, which flows into Lake Superior) with Cabot Strait, leading into… … Universalium
Western Interior Seaway — during the mid Cretaceous, about 100 million years before the present The Western Interior Seaway, also called the Cretaceous Seaway, the Niobraran Sea, and the North American Inland Sea, was a huge inland sea that split the continent of North… … Wikipedia
Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene … Universalium
Megalodon — For other uses, see Megalodon (disambiguation). Megalodon Temporal range: Late Oligocene Early Pleistocene 28–1.5 Ma … Wikipedia
Hawaiian monk seal — Conservation status Critically Endangered ( … Wikipedia
Walrus — For other uses, see Walrus (disambiguation). Walrus[1] … Wikipedia
Megalonyx — Temporal range: late Miocene to Pleistocene Megalonyx wheatleyi skeleton. Scientific classification Kingdom … Wikipedia
Isthmus of Panama — The Isthmus of Panama, also historically known as the Isthmus of Darien, is the narrow strip of land that lies between the Caribbean Sea and the Pacific Ocean, linking Central and South America. It was formed some 3 million years ago during the… … Wikipedia
North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… … Universalium
Midwestern United States — Midwest redirects here. For other uses, see Midwest (disambiguation). Midwest as defined by U.S. Census Bureau The Midwestern United States is one of the four U.S. geographic regions defined by the United States Census Bureau, providing an… … Wikipedia
