Antarctica now is a baron frozen continent with little life. 170 million years ago it was a more habitable environment because was oriented at a different location on earth. The two new species of dinosaurs were that of a meat-eater and a plant-eater. The meat-eater was found on an ancient island the used to be covered by sea and the plant-eater was discovered on the slopes of a mountain that is 13,000 feet high but probably a riverbed at the time when this dinosaur roamed the earth. This discovery not only shows how continental drift and plate tectonics helped the dinosaurs move but also the discovery of two new species of dinosaur.
“New findings show some dinosaurs thrived in cold climates. Dramatic evidence comes from Alaska 's North Slope, where William A. Clemens and L. Gayle Nelms of the University of California, Berkeley, have found signs, which they reported in the June issue of Geology (vol. 21, p. 503-506), that several dinosaur species spent the winters in cold, dark climates.” (Morell) These are very believable facts but there’s no indication that this was due to major climate change. More evidence
In this essay, I am going to give supporting evidence of dinosaurs being both warm and cold blooded. I will provide background information on the dinosaur that was discovered and what information it provides scientists. Until recently, scientists believed the chances of finding a fossilized dinosaur heart were extremely slim. The heart belonged to a 66 million year old dinosaur found in Harding County in Northwestern South Dakota. The dinosaur, found in 1993, weighed over 650 pounds and was 13 feet long.
Researchers have a number of questions that they hope to answer by investigating Antarctica. The Earth’s southernmost continent is composed of land that is completely encircled by ocean and in most places, is covered by ½ mile of glacial ice. Sometimes called a polar desert, Antarctica is the most arid of all the continents, with very little snow falling each year. Scientists wonder what type of land forms can be identified beneath the ice, how glaciers work, and if movement of under-ice rivers and lakes causes the ice sheets to move forward more quickly. They seek to discover what life forms are able to live there, and what special adaptations diverse species may have developed in order to survive.
Examination of The Winton Dinosaur Project Findings in the Queensland, Australia Winton Dinosaur project show that the sauropod named "Elliot" may have died with his mate by his side (Salleh 2003). Anna Salleh from ABC Science Online discusses the new fossil evidence found by Dr. Steve Salisbury from the University of Queensland, who is one of the leading researchers on the Winton Project (2003). Dr. Alex Cook and assistants Scott Hocknull and Dr. Steve Salisbury lead the Winton Project. Elliot is one of the largest dinosaurs found to date in Australia, dating to about 98-95 million years ago (Beirne 2001). According to researchers, Queensland, Australia was covered by a vast inland sea during the time of the dinosaurs 98-95 million years ago.
These two continents were during the Jurassic period (150 million years ago). These two continents then further broke up to form our continents today. This happened at the end of the Cretaceous period (65 million years ago). Figure 1.1 showing continental drift. In 1915 Alfred Wegener who was a German geologist discovered identical fossils of plants and animals on different sides of the Atlantic.
These fossils are said to be related to the carnivorous theropods, such as tyrannosaurs and velociraptors. Theropods have been related with birds and this new fossil’s feet as well as teeth relate it to the extinct carnivores. Also, due to the size and shape of the foot and leg bones, the animal is said to be a running dinosaur about six to eight feet tall. Thousands of miles away from this excavation sight and during the same week, William Hammer and his research team were in the mountains of Antarctica, about thirteen thousand feet, specifically near the Beardmore Glacier. The pelvis to a plant-eating dinosaur was found buried in solid rock.
A skull of 95 million year old dinosaurs which unearthed from narmada river bed region of India has raised hot debate among researchers. Because the dinosaurs fossils totally contradict with the theory of continental drifting which proposed by German meteorologist Alfred Wagner. According to this theory before 200 million years ago all the present day continents were jointly present and the super continent was called as pangaea.and then splited in two major continents called as northern laurasia and the southern gonduwana.the theory continue to explains... From the gonduwana south America, south africa, antartica, australia, india and Madagascar separated before 150 million year ago and India was splited and drifted northward crossing the equator 70 million year ago and then collided with the Asian continet.due to the collision the Himalayas was formed and the collision also caused earthquake. But based on the study of dinosaur?s skull paleontologist say the dinosaurs that unearthed from the Gurath region was appeared 95 million years ago. The Gujarat dinosaurs have close relation with the dinosaurs that lived in South America and Madagascar.
State of Research on the "Snowball Earth Hypothesis" The "Snowball Earth Hypothesis" also known as the "Varangia glaciation" is a hypothesis presented in 2001 by Geologist Paul Hoffman. (Wikipedia, 2002) The hypothesis purposes that 540 million years ago during the Neoproterozic, a meter thick of ice covered the oceans and glaciers the continents for 100 million years. Albedo; when ice and snow reflect solar radiation into space, in absents of greenhouse gases, which don't exist within the atmosphere, heat therefore escapes the planet. A condition of temperature disequilibrium occurs, when freezing cold reaches a state, the climate never warms to normal, and cold freezes the hemisphere and buries it under massive glaciation. The glaciers begin when a green house gas, carbon dioxide, is depleted from erosion of silicates.
"The new data are showing what's going on on Mars seasonally as well as on interannual time scales in much more detail than we had with previous observations," Paige told SPACE.com. Where the snow is Both of Mars' polar regions are covered in permanent caps of ice. Scientists have known since the 1970s that some of the ice in the north is water ice. There may be water ice in the south, too, but there is no firm evidence. Both poles are covered in a veneer of carbon dioxide ice, popularly called "dry ice" here on Earth.