Cretaceous

The actual evolutionary origin of the hadrosaurs first began in the late cretaceous period roughly 70 million years ago. These dinosaurs “were members of the Ornithopoda, and close relatives and possible descendants of iguanodontid dinosaurs.” (Carroll, R.L. 1988). They lived in a variety of different environments which led to

End Cretaceous Mass Extinction "By The end of the Mesozoic Era one massive extinction occurred known as The Cretaceous Mass Extinction.This Extinction was assumed to have been caused as result of two mechanism recognized as the impact and the flood volcanism hypothesis". The impact hypothesis which is the asteroid discovered by the physicist luiz Alvarez played a role in causing the cretaceous mass extinction It was supported through evidence these facts are: Alvarez discovered unusually high

1.1 Abstract: For a period of 27 years, Frigg Field in the North Sea has offered oil and gas exploration from the reservoir. The Fridge Field is located astride the boundary that exists between Norway and United Kingdom in the North-Central part of the North Sea at a distance of 200 kms west of Haugesund, Norway (Heritier, et al., 1990). From the initial stages of the project through to the end the project was internationally shared and managed by two countries. The precise location of the project

the same types of formations, fossil evidence, and clay layer in Spain, and had the same questions. These questions and subsequent investigations, studies, and experiments, led to the discovery of the K-T Boundary, the dividing line between the Cretaceous and Tertiary Periods and the end of the Mesozoic Era – about 65 million years ago. These discoveries and the search for answers led to work by a diverse group of scientists from a number of different disciplines finding evidence of a catastrophic

People often wonder why a Tyrannosaurus Rex or a Centrosaurus is no longer roaming around the world today. They wonder about what happened to the dinosaurs, but they cannot be given a certain answer. That is because the disappearance of dinosaurs is an event in history that is still being debated today. There are different theories that try to explain the extinction, but the two theories that have been most accepted are the asteroid impact theory and the volcanism theory (Ducharme). One major

extinction through natural causes, or did it happen suddenly? These questions give rise to many different beliefs on how the dinosaurs disappeared over sixty-five million years ago. Something happened sixty-five million years ago, at the end of the Cretaceous period that was so devastating that it altered the course of life on earth. Extinction is easily defined: the birth rate fails to keep up with the death rate. However, the definition does not answer the question about the nature or causes of extinction

Dinosaurs ruled the earth for over 65 million years and thankfully for the human race, they became extinct. Ultimately, only a major catastrophe could completely wipe out an entire species, let alone an entity of dinosaurs and the debacle on the causes of dinosaur extinction have flooded the minds of paleontologists for centuries. Geologist and zoologist Stephen Jay Gould published “Sex, Drugs, Disasters, and the Extinction of Dinosaurs,” to compare scientific and speculative causes of dinosaur

Cribbins 1 Hook. The extinction of dinosaurs is a mystery in itself that has stumped scientists all over the world for decades, and they still look for new answers every day. Scientists know some background information, but cannot connect the dots to see the bigger picture. There was little interest in the topic until Luis and Walter Alvarez proposed a groundbreaking hypothesis, which today we call the “Alvarez Hypothesis”. This new idea of the Alvarez’s was exciting, and therefore got the media

The Tyrannosaurus rex was one of the most powerful and prevailing dinosaurs to ever exist. These large carnivores lived during the late Cretaceous Period, which was about 66 million years ago. They roamed the lands of which is now present day western North America. Its name comes from the Greek and Latin origins, the word ‘tyrannosaurus’ meaning ‘tyrant lizard’ in Greek, and ‘rex’ meaning ‘king’ in Latin. The infamous T-Rex had a very unique body structure. A massive 5-foot long skull, tiny 3-foot

It is difficult to envision that one of the greatest impact craters on Earth that measures up to 180km wide and 900m deep could just vanish just from sight. There have been many different dinosaur extinction theories offered in the recent decades. These range from poisonous plants to mass suicide by dinosaur herds. Although one concept as to how the dinosaurs became extinct has gained a wide acceptance since the 1980’s, involving a major earth impact by a meteor or comet (Icr.org, 2014). This horrific