Prehistoric inland sea that split the continent of North America
Map of North America with the Western Interior Seaway during the Campanian
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 two landmasses. The ancient sea, which existed from the early Late Cretaceous (100 Ma) to the earliest Paleocene (66 Ma), connected the Gulf of Mexico to the Arctic Ocean. The two land masses it created were Laramidia to the west and Appalachia to the east. At its largest extent, it was 2,500 feet (760 m) deep, 600 miles (970 km) wide and over 2,000 miles (3,200 km) long.
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The WesternInteriorSeaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, and the WesternInterior Sea) was a large...
of marine ecosystems; its arrival in some locations such as the WesternInteriorSeaway in North America coincides with a complete turnover of faunal assemblages...
The WesternInteriorSeaway, was a large inland sea that started to expand in the early Cretaceous period, though geological evidence suggests it started...
Three WesternInteriorSeaway anoxic events occurred during the Cretaceous in the shallow inland seaway that divided North America in two island continents...
clays, and shales deposited in the Mid-Cretaceous opening of the WesternInteriorSeaway. The usage of the name Dakota for this particular Albian-Cenomanian...
existed during the Late Cretaceous period (99.6–66 Ma), when the WesternInteriorSeaway split the continent of North America in two. In the Mesozoic era...
the WesternInteriorSeaway was formed. This body of water extended from present-day Alaska to the Gulf of Mexico and covered almost all the interior plains...
escape from fellow marine predators. It inhabited the northern WesternInteriorSeaway, a mild to cool temperate area, dominated by plesiosaurs, hesperornithiform...
fossils have been found worldwide, although most frequently in the WesternInteriorSeaway area of North America. It preferred mainly subtropical to temperate...
Hill Chalk deposits of western Kansas. These chalk beds were deposited at the bottom of what was once the WesternInteriorSeaway, a large shallow sea over...
low-lying eastern continental margin fronting the late Cretaceous WesternInteriorSeaway. The climate was mild, and the presence of crocodilians along with...
years ago. A large number of remains have been found in the former WesternInteriorSeaway. Due to a global distribution Ptychodus is well represented in...
years ago, the San Luis Valley lay on the shore of or beneath the WesternInteriorSeaway, a shallow sea which divided North America into two parts. As the...
Mesozoic, the Cretaceous dawned. Another warm, shallow sea, the WesternInteriorSeaway, then partly and sometimes completely covered the Teton region...
Cretaceous, North America would be divided in two by the WesternInteriorSeaway, a large interior sea, separating Laramidia to the west and Appalachia to...
Cretaceous period when the western part of the WesternInteriorSeaway covered the region. Terranes started to collide with the western edge of North America...
States, which back then was within a large inland sea called the WesternInteriorSeaway. It has been suggested that it would have flown similar to modern-day...
closely related to modern octopuses. Although many specimens from WesternInteriorSeaway of North America were described, at 2019, only one, poorly preserved...
also been found in northern Mexico. It lived on both sides of the WesternInteriorSeaway, and was an opportunistic apex predator in the coastal regions...
recovered from Appalachia. During the Late Cretaceous period, the WesternInteriorSeaway divided the continent of North America into two landmasses; one...
Pierre Shale formation, which represents marine deposits from the WesternInteriorSeaway. In early 1867, the American army surgeon Theophilus H. Turner...
deposition of the Niobrara Chalk, much life inhabited the seas of the WesternInteriorSeaway. By this time in the Late Cretaceous many new lifeforms appeared...
completely across the central portion of North America and created the WesternInteriorSeaway from the Gulf of Mexico to the Arctic Ocean. The opposite of transgression...
separated from the island continent of Appalachia to the east by the WesternInteriorSeaway. The latitudinal range of ceratopsians across Laramidia extends...
WesternInteriorSeaway, which divided North America into eastern and western landmasses (Appalachia and Laramidia, respectively), the Hudson Seaway had...
Cretaceous times, the WesternInteriorSeaway ran from the Gulf of Mexico to the Arctic Ocean, dividing North America into eastern and western land masses. From...
on a narrow strip on the east-coast of Laramidia, bordering the WesternInteriorSeaway and constrained in the west by the 3 to 4 kilometres (2 to 2.5 mi)...
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