WebFormation and Geologic History: The Badlands National Park has a complex geologic history that spans millions of years. The story of the park’s formation begins around 75 million years ago during the Late Cretaceous period, when the region was covered by an inland sea called the Western Interior Seaway. WebThe late Cretaceous was the time of the last major seaway across Texas, because mountains were forming in the western United States that influenced areas as far away as Texas. A chain of volcanoes formed beneath the late Cretaceous seas in an area roughly parallel to and south and east of the old, buried Ouachita Mountains.

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WebINTRODUCTION. Rocks, minerals, and fossils found on the surface of Dallas and Tarrant Counties were deposited in the Mesozoic Era and Cenozoic Era. (See Geologic Time Chart) The resulting formations are … WebNov 1, 2016 · Temperature and salinity of the Late Cretaceous Western Interior Seaway Sierra V. Petersen; Sierra V. Petersen 1 Earth and Environmental Sciences Department, … people first icon

Geology Field Trip opportunity for science educators, April 22-23

The ancient sea, which existed from the early Late Cretaceous (100 million years ago) to the earliest Paleocene (66 Ma ), connected the Gulf of Mexico, through the United States and Canada, to the Arctic Ocean. The two land masses it created were Laramidia to the west and Appalachia to the east. See more The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, and the Western Interior Sea) was a large inland sea that split the continent of North America into … See more • Oceans portal • Geology of the Bryce Canyon area – Geology of the area in Utah • Hudson Seaway – Major seaway of North America during the … See more • Marine Reptiles of South Dakota • Paleo Map Project • Cretaceous paleogeography, southwestern US See more By Late-Cretaceous times, Eurasia and the Americas had separated along the south Atlantic, and subduction on the west coast of the Americas had commenced, resulting in the See more The Western Interior Seaway was a shallow sea, filled with abundant marine life. Interior Seaway denizens included predatory marine reptiles such as plesiosaurs, … See more • Kauffman, Erle G.; Caldwell, W.G.E. (1993). "The Western Interior Basin in Space and Time". In Caldwell, W.G.E.; Kauffman, Erle G. (eds.). Evolution of the Western Interior Basin. … See more WebFeb 24, 2015 · The shorelines of this epicontinental seaway were oriented generally north-south and repeatedly shifted position to the east or west in response to continuing changes in global sea level. This sea level … WebThe Pierre Shale is the youngest Cretaceous unit in the state of Nebraska. It was deposited during the Campanian and Maastrichtian (~70-80 million years ago). This unit consists of dark gray/black shales that were deposited in deep marine waters. Within the shale unit are several distinct ash layers (bentonites), which have been used to help ... people first ideas