GEOL 1020 Lecture Notes - Lecture 20: Sedimentology, Mesozoic, Cenozoic
7 Dec 2017
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Document Summary
Ammonites may have been a favorite food of mosasaurs (ancient marine lizards of the western interior seaway). Some argue against this, because the shells did not crack. The shells with holes in them may be the ammonites that got away. These holes could also be made by little organisms that drill into shells. In the west-to-east transect from utah to nebraska, the sea first intruded the land between colorado and nebraska. At its greatest extent, the sea had expanded as far west as utah. Geologists measure geologic cross-sections across north america and study the rocks and fossils to map the regional extent of the western interior seaway (cretaceous interior seaway) Mountain building event in western utah at this time, which produces high energy streams and conglomerates. Laramidia was an island continent (~99-66 ma) on the western side of the. There were many dinosaurs found in this area that are different from any other.
