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Which geological time boundary marked the extinction of dinosaurs?
Wiki User
∙ 12y ago
Non-avian dinosaurs went extinct at the very end of the Maastrichtian age of the Cretaceous period, around 65.5 million years ago, in a proposed extinction event called the "K-T event", or "K-Pg event" (in more modern scientific parlance) . The specific geological marker of this event is the "K-T boundary", which is usually a thin band of sediment famous for being rich in iridium, which many believe was deposited there during a massive meteorite impact that initiated the K-T event and directly or indirectly caused the extinction of many animal species, including all of the non-avian dinosaurs.
Wiki User
∙ 12y ago
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What kind of dinosaurs were there in the cretaceous period?
The T-Rex and Triceratops. The extinction of the dinosaurs marked the end of the cretaceous period.
Why is there correspondence between mass extinction and the ends of geological periods?
Because mass extinction events marked the loss of a number of a species to fill the available ecological niches, these events correspond to geological period boundaries.
During which period the dinosaurs disappeared on the Earth?
The Cretaceous / Tertiary boundary (KT) occurred 65 million years ago and extinctions of most dinosaurs was probably due to a meteorite impact in the Yucutan peninsular of Mexico known as the Chixulub crater.
What period did the dinosaurs become extinct?
Around the end of the Cretaceous Period.Dinosaurs became extinct at the end of the Mesozoic Era 65 million years ago. Their extinction also marked the beginning of the Cenozoic Era.Dinosaurs disappeared near the end of the cretaceous period.Most people believe it was at the end of the Cretaceous however the truth is that it ended in the Tertiary PERIOD not era so be careful that was why the event was called the K-T event because c had been taken in a mass extinction in the oceans.All non avian dinosaurs lived in the Mesozoic Era (251 - 65Ma). The mass extinction 65 million years ago of all non avian dinosaurs along with many other types of animals and plants marks the boundary between the Mesozoic and the Cenozoic Eras.
What feature marked he western boundary of british claims?
The Appalachian Mountains marked the western boundary of British claims.
What is the K-t boundary layer?
K-T stands for Cretaceous-tertiary boundary. The K is used instead of a C to help that there is no confusion between the Cretaceous and Carboniferous Periods; as the Carboniferous Period was among one of the first periods. The K-T boundary is marked by the element named Iridium, the K-T boundary contains approximately 31% iridium, this element is rare on Earth, common in space debris, such as asteroids and meteors/meteorites, such as the one believed to have hit the Earth causing the extinction of the dinosaurs. The Cretaceous was the last of the dinosaur bearing periods. The Tertiary period is the period we as humans live in currently.
What event marked the end of the Mesozoic Ara and the beginning of the Cenozoic?
An asteroid impact
What is an ocean to continent boundary?
An ocean to continent boundary is where the oceanic crust meets the continental crust. This typically occurs at a continental shelf, which is the gently sloping transition between the continent and the ocean floor. This boundary is marked by significant differences in physical and geological characteristics between the two crust types.
The ends of the geologic eras such as the Paleozoic and Mesozoic are marked by?
mass extinction
What geological features marked the eastern border of the Persian?
Hindu Kush Mountains
Did the rocky mountains mark the western boundary of the United States at the time of the French and Indian War?
The Appalachain Mountains marked the western boundary during the French and Indian War. Afterwards, it was mainly the Mississippi River that marked the boundary.
What political boundary is marked by mogollon rim have?
congressional district
