Cedar Mountain Formation

Herausgegeben:Miller, Frederic P.; Vandome, Agnes F.; McBrewster, John

• Broschiertes Buch

Produktbeschreibung

High Quality Content by WIKIPEDIA articles! The Cedar Mountain Formation is the name given to distinctive sedimentary rocks in eastern Utah that occur between the underlying Morrison Formation and overlying Naturita Formation (sometimes incorrectly called the Dakota Formation). It is composed of non-marine sediments, that is, sediments deposited in rivers, lakes and on flood plains. Based on various fossils and radiometric dates, the Cedar Mountain Formation was deposited during the last half of the Early Cretaceous, about 127 - 98 million years ago (mya). Dinosaurs occur throughout the formation, but their study has only occurred since the early 1990s. The dinosaurs in the lower part of the formation differ from those in the upper part. These two dinosaur assemblages, characterized by distinct dinosaurs, show the replacement of older, European-like dinosaurs with younger, Asian-like dinosaurs as the North American Continental Plate drifted westward. A middle dinosaur assemblage may be present, but the fossil record is not clear.

Produktdetails

• Verlag: Alphascript Publishing
• Seitenzahl: 80
• Englisch
• ISBN-13: 9786130815912
• ISBN-10: 6130815913
• Artikelnr.: 29745902