Western Interior Seaway Map
The type section of the fall river formation is exposed here on highway 18 headed to hot springs.
Western interior seaway map. The early seaway. Ancient sea levels north america cretaceous. Note that the shorelines of the western interior seaway changed almost continuously as sea levels went up and down and the western half of north america was. The museum has a wonderful large scale map of north america during the late cretaceous.
From about 100 million to 68 million years ago a shallow seaway covered much of the center of north america. The sevier mountains can be seen developing to the west and early laramide uplifts begin to appear in. The western interior seaway was a large inland sea that existed during the mid to late cretaceous period as well as the very early paleogene splitting the continent of north america into two. In the black hills this transgression is preserved in the fall river formation.
Wahrend des fruhen palaozans uberschwemmten teile des westlichen interior seaway den unterlauf des mississippi bis zum heutigen memphis. North america during the late cretaceous. Model is a bit less complicated and less distracting as far as the western interior seaway is concerned this allows attention to be focused easier on the western interior seaway. Der western interior seaway teilte sich und zog sich sudwarts zum golf von mexiko zuruck.
University of nebraska state museum lincoln nebraska. This animation shows the movement of shorelines through colorado and surrounding areas from 100 million to 66 million years ago. The wyld et al. Seven key time slice maps 130 115 105 92 85 77 and 72 ma overlap with the wis maps.
The western interior seaway was also home to early birds including the flightless hesperornis which had stout legs for swimming through the water and small wing like appendages used for marine steering rather than flight. Diese schrumpfende regressive phase des western interior seaway wird pierre seaway genannt. 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 existed during the mid to late cretaceous period as well as the very early paleogene splitting the continent of north america into two landmasses laramidia to the west and. Western interior seaway 697 ma maastrichtian western interior seaway 704 ma campanianmaastrichtian western interior seaway 721 ma campanian late.
The earliest incursion of the western interior seaway occurred approximately 110 million years ago during the albian age.
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