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Burning to manage wildlife habitat did continue and was a common practice by 1950. Longleaf pine dominated the coastal plains until the early 1900s, where loblolly and slash pines now dominate. [10] At low altitudes in the Rocky Mountain region, large areas of Ponderosa pine and Douglas fir had an open park-like structure until the 1900s.
Waldo Rudolph Wedel (September 10, 1908 – August 27, 1996) was an American archaeologist and a central figure in the study of the prehistory of the Great Plains. He was born in Newton, Kansas to a family of Mennonites. In 1939 he married Mildred Mott, a fellow archaeologist and ethnohistorian. [1]
A 100-year flood is a flood event that has on average a 1 in 100 chance (1% probability) of being equaled or exceeded in any given year. [1] A 100-year flood is also referred to as a 1% flood. [2] For coastal or lake flooding, a 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects. For river systems ...
The Red Beds of Texas and Oklahoma are a group of Early Permian-age geologic strata in the southwestern United States cropping out in north-central Texas and south-central Oklahoma. They comprise several stratigraphic groups , including the Clear Fork Group , the Wichita Group , and the Pease River Group . [ 1 ]
The Interior Plains physiographic area stretches across Canada and the United States, and the two governments each use a different hierarchical system to classify their portions. In Canada, the Interior Plains makes up one of seven physiographic areas included in the highest level of classification - defined as a "region" in that country.
The Mandan population was 3,600 in the early 18th century. [2] It is estimated to have been 10,000–15,000 before European encounter. Decimated by a widespread smallpox epidemic in 1781, the people had to abandon several villages, and remnants of the Hidatsa also gathered with them in a reduced number of villages.
A seafloor map captured by NASA Bathymetry ( / b ə ˈ θ ɪ m ə t r i / ; from Ancient Greek βαθύς ( bathús ) 'deep' and μέτρον ( métron ) 'measure') [ 1 ] [ 2 ] is the study of underwater depth of ocean floors ( seabed topography ), lake floors, or river floors.